First Mining Gold (FFMGF) 40-F 31 Mar 20 2019 FY Annual report (Canada) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2019shares
Document And Entity Information
Entity Registrant Name	First Mining Gold Corp.
Entity Central Index Key	0001641229
Document Type	40-F
Document Period End Date	Dec. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity's Reporting Status Current?	Yes
Is Entity Emerging Growth Company?	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding	591,997,138
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
Current
Cash and cash equivalents	$ 5,902	$ 5,115
Accounts and other receivables (Note 4)	303	149
Prepaid expenditures	349	257
Marketable securities (Note 5)	1,775	2,597
Total current assets	8,329	8,118
Non-current
Mineral properties (Note 6)	252,815	244,129
Mineral property investments (Note 7)	5,398	4,417
Property and equipment	608	662
Right-of-use asset (Note 8)	648	0
Reclamation deposit	119	116
Other receivables (Note 4)	103	90
Total non-current assets	259,691	249,414
TOTAL ASSETS	268,020	257,532
Current
Accounts payable and accrued liabilities (Note 9)	1,398	582
Flow-through share premium liability (Note 12)	341	0
Current portion of lease liability (Note 8)	94	0
Current portion of environmental reclamation provision (Note 10)	716	0
Total current liabilities	2,549	582
Non-current
Lease liability (Note 8)	554	0
Environmental reclamation provision (Note 10)	1,639	0
Deferred tax liabilities (Note 15)	946	0
Total non-current liabilities	3,139	0
TOTAL LIABILITIES	5,688	582
SHAREHOLDERS' EQUITY
Share capital (Note 11)	282,666	275,068
Warrant and share-based payment reserve (Note 11)	33,330	30,230
Accumulated other comprehensive loss	(3,649)	(5,292)
Accumulated deficit	(50,015)	(43,056)
Total shareholders' equity	262,332	256,950
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 268,020	$ 257,532

CONSOLIDATED STATEMENTS OF NET

CONSOLIDATED STATEMENTS OF NET LOSS AND COMPREHENSIVE LOSS - CAD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Expenses (Note 13)
General and administration	$ 3,414	$ 4,692
Exploration and evaluation	1,124	764
Investor relations and marketing communications	1,177	1,634
Corporate development and due diligence	517	505
Write-down of mineral properties (Note 6)	341	4,181
Loss from operational activities	(6,573)	(11,776)
OTHER ITEMS
Foreign exchange loss	(4)	(5)
Other expenses	(78)	(54)
Interest and other income	212	190
Loss before income taxes	(6,443)	(11,645)
Deferred income tax expense (Notes 12, 15)	(516)	0
Net loss for the year	(6,959)	(11,645)
Items that will not be reclassified to net (loss) or income:
Marketable securities fair value gain (loss) (Note 5)	705	(1,680)
Mineral property investments fair value gain (note 7)	981	0
Items that may be reclassified to net (loss) or income:
Currency translation adjustment	(43)	431
Other comprehensive loss	1,643	(1,249)
Total comprehensive loss for the year	$ (5,316)	$ (12,894)
Basic and diluted loss per share	$ (0.01)	$ (0.02)
Weighted average number of shares outstanding - Basic and Diluted	574,872,959	557,470,696

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - CAD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net loss for the year	$ (6,959)	$ (11,645)
Adjustments for:
Depreciation	171	204
Unrealized foreign exchange loss	0	15
Share-based payments (Note 11(d))	1,596	3,032
Accrued interest receivable and other income	(59)	9
Accrued other expenses	65	43
Write-down of mineral properties (Note 6)	341	4,181
Deferred income tax expense (note 12, 15)	516	0
Operating cash flows before movements in working capital	(4,329)	(4,161)
Changes in non-cash working capital items:
(Increase) decrease in accounts and other receivables	(242)	259
(Increase) decrease in prepaid expenditures	(87)	63
Increase in accounts payables and accrued liabilities	458	58
Total cash used in operating activities	(4,200)	(3,781)
Cash flows from investing activities
Property and equipment purchases	(123)	(93)
Mineral property expenditures (Note 6)	(6,031)	(7,402)
Option payments and expenditures recovered	83	0
Proceeds from sale of marketable securities (Note 5)	1,758	0
Total cash used in investing activities	(4,313)	(7,495)
Cash flows from financing activities
Proceeds from private placements (Note 11(b))	9,410	0
Shares issuance costs (Note 11(b))	(152)	0
Proceeds from exercise of warrants and stock options	43	989
Total cash provided by financing activities	9,301	989
Foreign exchange effect on cash	(1)	2
Change in cash and cash equivalents	787	(10,285)
Cash and cash equivalents, beginning	5,115	15,400
Cash and cash equivalents, ending	5,902	5,115
Cash and cash equivalents	$ 5,115	$ 15,400

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - CAD ($)	Capital Stock	Warrant Reserve	Share-based Payment Reserve	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Total
Beginning balance, shares at Dec. 31, 2017	552,547,616
Beginning balance, amount at Dec. 31, 2017	$ 272,501	$ 15,007	$ 12,600	$ 4,043	$ (31,411)	$ 264,654
Share issuance cost, amount						0
Exercise of options, shares 11(d))	638,000
Exercise of options, amount 11(d))	$ 276		171			105
Exercise of warrants, shares 11(c))	5,131,300
Exercise of warrants, amount	$ 2,291	1,407				884
Options forfeited (Note 11(d))			39			39
Share-based payments			4,240			4,240
Loss for the year					(11,645)	(11,645)
Other comprehensive loss				1,249		(1,249)
Ending balance, shares at Dec. 31, 2018	558,316,916
Ending balance, amount at Dec. 31, 2018	$ 275,068	13,600	16,630	(5,292)	(43,056)	256,950
Proceeds from private placements (Note 11(b)), shares	33,095,772
Proceeds from private placements (Note 11(b)), amount	$ 8,392	1,018				9,410
Flow-through share premium liability	$ (771)					(771)
Share issuance cost, shares	370,250
Share issuance cost, amount	$ (131)	(21)				152
Exercise of warrants, shares 11(c))	214,200
Exercise of warrants, amount	$ 108	(65)				43
Share-based payments			2,168			2,168
Loss for the year					(6,959)	(6,959)
Other comprehensive loss				1,643		1,643
Ending balance, shares at Dec. 31, 2019	591,997,138
Ending balance, amount at Dec. 31, 2019	$ 282,666	$ 14,532	$ 18,798	$ (3,649)	$ (50,015)	$ 262,332

NATURE OF OPERATIONS

NATURE OF OPERATIONS	12 Months Ended
	Dec. 31, 2019
Nature Of Operations
NATURE OF OPERATIONS	First Mining Gold Corp. (formerly First Mining Finance Corp.) (the “Company” or “First Mining”) was incorporated in Canada on April 4, 2005. The Company changed its name to First Mining Gold Corp. in January 2018. First Mining is a Canadian-focused gold exploration and development company. The Company’s primary focus is the development and permitting of its Springpole Gold Project and the advanced exploration of its Goldlund Gold Project, both located in northwestern Ontario. First Mining is a public company which is listed on the Toronto Stock Exchange (the “TSX”) under the symbol “FF”, on the OTCQX under the symbol “FFMGF”, and on the Frankfurt Stock Exchange under the symbol “FMG”. The Company’s head office and principal address is Suite 2070 – 1188 West Georgia Street, Vancouver, British Columbia, Canada, V6E 4A2.

BASIS OF PRESENTATION

BASIS OF PRESENTATION	12 Months Ended
	Dec. 31, 2019
Basis Of Presentation
BASIS OF PRESENTATION	These consolidated annual financial statements have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board, effective for the Company’s reporting for the year ended December 31, 2019. These consolidated annual financial statements have been prepared on a historical cost basis, except for financial instruments classified as fair value through profit and loss or fair value through other comprehensive income (loss), which are stated at their fair value. The consolidated annual financial statements are presented in thousands of Canadian dollars, unless otherwise noted. The functional currency of the Company and its Canadian subsidiaries is the Canadian dollar while the functional currency of the Company’s non-Canadian subsidiaries is the US dollar. The accounts of subsidiaries are prepared for the same reporting period as the parent company, using consistent accounting policies. Inter-company transactions, balances and unrealized gains or losses on transactions are eliminated. The Company’s material subsidiaries are as follows: Name Place of Incorporation Ownership Percentage First Mining Gold Corp. Canada Parent Gold Canyon Resources Inc. (“Gold Canyon”) Canada 100% Goldlund Resources Inc. (“Goldlund”) Canada 100% Coastal Gold Corp. (“Coastal Gold”) Canada 100% Cameron Gold Operations Ltd. (“Cameron Gold”) Canada 100% PC Gold Inc. (“PC Gold”) Canada 100% Clifton Star Resources Inc. (“Clifton”) Canada 100% These consolidated annual financial statements were approved by the Board of Directors on March 30, 2020.

ACCOUNTING POLICIES

ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2019
Accounting Policies
ACCOUNTING POLICIES	These consolidated annual financial statements have been prepared using the following accounting policies: a) New accounting policy – IFRS 16 The Company has adopted IFRS 16 Leases (“IFRS 16”) which is effective for annual periods beginning on or after January 1, 2019. IFRS 16 specifies how to recognize, measure, present and disclose leases. The standard provides a single lessee accounting model, requiring lessees to recognize a right-of-use asset and a lease liability for all leases unless the lease term is 12 months or less or the underlying asset has a low value. For new leases, the right-of-use asset is initially measured at the amount of the liability plus any initial direct costs. After lease commencement, the lessee shall measure the right-of-use asset at cost less accumulated depreciation and accumulated impairment. A lessee shall either apply IFRS 16 with full retrospective effect or alternatively not restate comparative information but recognise the cumulative effect of initially applying IFRS 16, if any, as an adjustment to opening equity at the date of initial application. The adoption of IFRS 16 did not have an impact on the Company’s consolidated annual financial statements as at the date of adoption. Subsequent to January 1, 2019, the Company entered into a lease agreement which was in scope of IFRS 16 (Note 8). b) New accounting policy – Flow-through units and shares The Company may, from time to time, issue flow-through common shares or units to finance a portion of its Canadian exploration programs. Pursuant to the terms of the flow-through share agreements and the Income Tax Act (Canada) (the “ITA Upon the issuance of a flow-through share, the Company bifurcates the flow-through share into i) fair value of capital stock issued, based on market price at time of issuance, and ii) the residual as a flow-through share premium, which is recognized as a liability. Upon the issuance of a flow-through unit, the Company bifurcates the flow-through unit into i) relative fair value of capital stock issued, ii) relative fair value of a warrant, and iii) the residual as a flow-through share premium, which is recognized as a liability. Upon incurring qualifying expenses the Company derecognizes the flow-through share premium liability and recognizes a credit to deferred tax expense (recovery). Proceeds received from the issuance of flow-through shares are to be used for Canadian resource property exploration expenditures within a certain time period as prescribed by the Government of Canada’s flow-through regulations, as contained in the ITA. The portion of the proceeds received but not yet expended at the end of the Company’s relevant reporting period is disclosed separately in the notes to the financial statements as flow-through expenditure commitments (Note 12). The Company is also subject to Part XII.6 of the ITA, which imposes a tax on flow-through proceeds renounced under the “Look-back Rule”, in accordance with the Government of Canada’s flow-through regulations. When applicable, this tax is accrued until paid. c) Financial Instruments (i) Classification The Company classifies its financial instruments in the following categories: at fair value through profit and loss (“FVTPL”), at fair value through other comprehensive income (loss) (“FVTOCI”) or at amortized cost. The Company determines the classification of financial assets at initial recognition. The classification of debt instruments is driven by the Company’s business model for managing the financial assets and their contractual cash flow characteristics. Equity instruments that are held for trading are classified as FVTPL. For other equity instruments, at the time of acquisition the Company can make an irrevocable election (on an instrument-by-instrument basis) to designate them as at FVTOCI. Financial liabilities are measured at amortized cost, unless they are required to be measured at FVTPL (such as instruments held for trading or derivatives) or the Company has opted to measure them at FVTPL. Upon the adoption of IFRS 9, the Company made an irrevocable election to classify marketable securities and mineral property investments (First Mining’s 10% equity interest in a group of privately held companies that own the Duparquet Gold Project) as FVTOCI given they are not held for trading and are instead held as strategic investments that align with the Company’s corporate objectives. (ii) Measurement Financial assets at FVTOCI Elected investments in equity instruments at FVTOCI are initially recognized at fair value plus transaction costs. Subsequently they are measured at fair value, with gains and losses recognized in other comprehensive income (loss). Financial assets and liabilities at amortized cost Financial assets and liabilities at amortized cost are initially recognized at fair value plus or minus transaction costs, respectively, and subsequently carried at amortized cost less any impairment. Financial assets and liabilities at FVTPL Financial assets and liabilities carried at FVTPL are initially recorded at fair value and transaction costs are expensed in the consolidated statements of net (loss) income. Realized and unrealized gains and losses arising from changes in the fair value of the financial assets and liabilities held at FVTPL are included in the consolidated statements of net (loss) income in the period in which they arise. Where management elected to recognize a financial liability at FVTPL, any changes associated with the Company’s own credit risk will be recognized in other comprehensive income (loss). (iii) Impairment of financial assets at amortized cost The Company recognizes a loss allowance for expected credit losses on financial assets that are measured at amortized cost. At each reporting date, the Company measures the loss allowance for a financial asset at an amount equal to the lifetime expected credit losses if the credit risk on the financial asset has increased significantly since initial recognition. If at the reporting date, the credit risk on the financial asset has not increased significantly since initial recognition, the Company measures the loss allowance for the financial asset at an amount equal to the twelve month expected credit losses. The Company recognizes in the consolidated statements of net (loss) income, as an impairment gain or loss, the amount of expected credit losses (or reversal) that is required to adjust the loss allowance at the reporting date to the amount that is required to be recognized. (iv) Derecognition Financial assets The Company derecognizes financial assets only when the contractual rights to cash flows from the financial assets expire, or when it transfers the financial assets and substantially all of the associated risks and rewards of ownership to another entity. Gains and losses on derecognition are generally recognized in the consolidated statements of net (loss) income. However, gains and losses on derecognition of financial assets classified as FVTOCI remain within accumulated other comprehensive income (loss). Financial liabilities The Company derecognizes financial liabilities only when its obligations under the financial liabilities are discharged, cancelled or expired. Generally, the difference between the carrying amount of the financial liability derecognized and the consideration paid and payable, including any non-cash assets transferred or liabilities assumed, is recognized in the consolidated statements of net (loss) income. d) Cash and Cash Equivalents Cash and cash equivalents include cash and short-term deposits that are readily convertible to known amounts of cash and which are subject to an insignificant risk of changes in value. The carrying amounts approximate fair value due to the short-term maturities of these instruments. e) Mineral Properties Once the legal right to explore a property has been acquired, costs directly related to exploration and evaluation expenditures are recognized and capitalized, in addition to the acquisition costs. These direct expenditures include such costs as mineral concession taxes, option payments, wages and salaries, surveying, geological consulting and laboratory costs, field supplies, travel and administration. Costs not directly attributable to exploration and evaluation activities, including general administrative overhead costs, are expensed in the period in which they are incurred. The Company may occasionally enter into option or royalty arrangements, whereby the Company will transfer part of its mineral properties, as consideration, for an agreement by the transferee to meet certain exploration and evaluation expenditures which would have otherwise been undertaken by the Company. Any cash consideration received from the agreement is credited against the costs previously capitalized to the mineral interest given up by the Company, with any excess cash accounted for as a gain on disposal. The Company assesses exploration and evaluation assets for impairment when facts and circumstances suggest that the carrying amount of an asset may exceed its recoverable amount. The recoverable amount is the higher of the asset’s fair value less costs to sell and value in use. Once the technical feasibility and commercial viability of extracting the mineral resource has been determined, the property is considered to be a mine under development and is classified as ‘mines under construction’. Exploration and evaluation assets are also tested for impairment before the assets are transferred to development properties. f) Impairment of Non-Financial Assets Mineral properties are subject to impairment tests whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. Where the carrying value of an asset exceeds its recoverable amount, which is the higher of value in use and fair value less costs to sell, the asset is written down accordingly. An impairment loss is charged to profit or loss. For the purposes of assessing impairment, assets are grouped at the lowest levels for which there are largely independent cash flows (cash-generating units). As a result, some assets may be tested individually for impairment and some are tested at a cash-generating unit level. Impairment reviews for the Company’s exploration and evaluation stage mineral properties are carried out on a property by property basis, with each property representing a single cash generating unit. An impairment review for an exploration and evaluation asset is undertaken when indicators of impairment arise, but typically when one of the following circumstances apply: ● The right to explore the area has expired or will expire in the near future with no expectation of renewal; ● Substantive expenditure on further exploration for and evaluation of mineral resources in the area is neither planned nor budgeted; ● No commercially viable deposits have been discovered, and the decision had been made to discontinue exploration in the area; and ● Sufficient work has been performed to indicate that the carrying amount of the expenditure carried as an asset will not be fully recovered. g) Property and equipment Property and equipment are recorded at cost less accumulated depreciation and accumulated impairment losses. The initial cost of an asset comprises its purchase price or construction cost, any costs directly attributable to bringing the asset into operation and, where applicable, the initial estimation of any asset retirement obligation. The purchase price or construction cost is the aggregate amount paid and the fair value of any other consideration given to acquire the asset. Depreciation is recognized in profit or loss on a straight-line basis over the following estimated useful lives: Buildings 10 years Machinery and equipment 5 years Furniture and fixtures 5 years Vehicles 5 years Computer equipment 3 years Computer software 1 year Depreciation methods, useful lives and residual values are reviewed at each financial year-end and adjusted if appropriate. h) Environmental Reclamation Provision The Company is subject to various government laws and regulations relating to environmental disturbances caused by exploration and evaluation activities. The present value of the estimated costs of legal and constructive obligations required to restore the exploration sites is recognized in the year in which the obligation is incurred. When a liability is recognized, the present value of the estimated costs (discounted using a risk-free rate) is capitalized by increasing the carrying amount of the related exploration property. Over time, the discounted liability is increased for the changes in present value based on current market discount rates and liability specific risks. Additional environment disturbances or changes in reclamation costs will be recognized as additions to the corresponding assets and reclamation provision in the year in which they occur. i) Income Taxes Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in net income except to the extent that it relates to a business combination or items recognized directly in equity or in other comprehensive loss. Current income taxes are recognized for the estimated income taxes payable or receivable on taxable income or loss for the current year and any adjustment to income taxes payable in respect of previous years. Current income taxes are determined using tax rates and tax laws that have been enacted or substantively enacted by the year-end date. Deferred tax assets and liabilities are recognized where the carrying amount of an asset or liability differs from its tax base, except for taxable temporary differences arising on the initial recognition of goodwill and temporary differences arising on the initial recognition of an asset or liability in a transaction which is not a business combination and at the time of the transaction affects neither accounting nor taxable profit or loss. Recognition of deferred tax assets for unused tax losses, tax credits and deductible temporary differences is restricted to those instances where it is probable that future taxable profit will be available against which the deferred tax asset can be utilized. At the end of each reporting year the Company reassesses unrecognized deferred tax assets. The Company recognizes a previously unrecognized deferred tax asset to the extent that it has become probable that future taxable profit will allow the deferred tax asset to be recovered. j) Share Capital Equity instruments are contracts that give a residual interest in the net assets of the Company. Financial instruments issued by the Company are classified as equity only to the extent that they do not meet the definition of a financial liability or financial asset. The Company’s common shares are classified as equity instruments. Incremental costs directly attributable to the issue of new shares or options are shown in equity as a deduction, net of tax, from the proceeds. Consideration received from a private placement financing involving units consisting of common shares and warrants is allocated to the share capital and the warrant reserve accounts using the relative fair value method. As prescribed by this method, the consideration is allocated to the value of share capital and warrant reserve on a pro rata basis. The share capital is valued at the closing share price of the Company on the completion date of the private placement and the warrant reserve is valued using the Black-Scholes option pricing model. k) Loss per Share Basic loss per share is calculated by dividing the net loss for the year by the weighted average number of shares outstanding during the year. Diluted loss per share is calculated using the treasury stock method. Under the treasury stock method, the weighted average number of shares outstanding used in the calculation of diluted income or loss per share assumes that the deemed proceeds received from the exercise of stock options, share purchase warrants and their equivalents would be used to repurchase common shares of the Company at the average market price during the year, if they are determined to have a dilutive effect. In periods when the Company has generated a net loss, stock options and share purchase warrants are not included in the computation of diluted loss per share as they are anti-dilutive. l) Share-based Payments Where equity-settled share options are granted to employees, the fair value of the options at the date of grant, measured using the Black-Scholes option pricing model, is charged to the statement of comprehensive loss or capitalized to mineral properties over the vesting period using the graded vesting method. Performance vesting conditions are taken into account by adjusting the number of equity instruments expected to vest at each reporting date so that, ultimately, the cumulative amount recognized over the vesting period is based on the number of options that eventually vest. Charges for options that are forfeited before vesting are reversed from share-based payment reserve. Where equity-settled share options are granted to non-employees, they are measured at the fair value of the goods or services received. However, if the value of goods or services received in exchange for the options cannot be reliably estimated, the options are measured using the Black-Scholes option pricing model. All equity-settled share-based payments are reflected in share-based payment reserve, until exercised. Upon exercise, shares are issued from treasury and the amount reflected in share-based payment reserve is credited to share capital, together with any consideration received. m) Segment Reporting Operating segments are reported in a manner consistent with the internal reporting provided to the chief operating decision-maker. The chief operating decision-maker is responsible for allocating resources and assessing performance of the operating segment. n) Accounting Policy Judgments and Estimation Uncertainty The preparation of financial statements requires the use of accounting estimates. It also requires management to exercise judgment in the process of applying its accounting policies. Estimates and judgments are regularly evaluated and are based on management’s experience and other factors, including expectations about future events that are believed to be reasonable under the circumstances. The use of judgments, estimates and assumptions affects the application of accounting policies and the reported amounts of assets and liabilities, income and expense. Actual results may differ from these estimates. The following discusses accounting policy judgments and the sources of estimation uncertainty that may result in material changes in the carrying amount of assets or liabilities within the next year: (i) Accounting policy judgements Impairment of Mineral Properties In accordance with the Company’s accounting policy for its mineral properties, exploration and evaluation expenditures on mineral properties are capitalized. There is no certainty that the expenditures made by the Company in the exploration of its property interests will result in discoveries of commercial quantities of minerals. The Company applies judgment to determine whether indicators of impairment exist for these capitalized costs. Management uses several criteria in making this assessment, including the period for which the Company has the right to explore, expected renewals of exploration rights, whether substantive expenditures on further exploration and evaluation of mineral properties are budgeted, and evaluation of the results of exploration and evaluation activities up to the reporting date. (ii) Estimation Uncertainty Determining Amount and Timing of Reclamation Provisions A reclamation provision represents the present value of estimated future costs for the reclamation of the Company’s mineral properties. These estimates include assumptions as to the future activities, cost of services, timing of the reclamation work to be performed, inflation rates and interest rates. The actual cost to reclaim a mine or exploration property may vary from the estimated amounts because there are uncertainties with respect to the extent of required future remediation activities, as studies are currently ongoing, and uncertainties in factors used to estimate the cost and potential changes in regulations or laws governing the reclamation of a mineral property. Management periodically reviews the reclamation requirements and adjusts the liability as new information becomes available and will assess the impact of new regulations and laws as they are enacted. Valuation of Mineral Property Investments The Company makes estimates and assumptions that affect the carrying value of its mineral property investments, which are comprised of equity interests in the shares of private companies. These financial assets are designated as fair value through other comprehensive income (loss), and management needs to determine the fair value as at each period end. As there is no observable market data which can be used to determine this fair value, management uses property specific and market based information to determine whether a significant change in the fair value of these investments has occurred. Changes to the property specific and market based variables could result in the fair value being less than or greater than the amount recorded. o) Accounting Standards Issued but Not Yet Applied There are no IFRS or International Financial Reporting Interpretations Committee interpretations that are not yet effective that would be expected to have a material impact on the Company’s consolidated financial statements.

ACCOUNTS AND OTHER RECEIVABLES

ACCOUNTS AND OTHER RECEIVABLES	12 Months Ended
	Dec. 31, 2019
Trade and other receivables [abstract]
ACCOUNTS AND OTHER RECEIVABLES	Category December 31, 2019 December 31, 2018 Current GST and HST receivables $ 231 $ 71 Quebec mining tax receivables - 61 Other receivables 72 17 Total current accounts and other receivables $ 303 $ 149 Non-current Mexican VAT receivable 103 90 Total accounts and other receivables $ 406 $ 239

MARKETABLE SECURITIES

MARKETABLE SECURITIES	12 Months Ended
	Dec. 31, 2019
Available-for-sale financial assets [abstract]
MARKETABLE SECURITIES	The movements in marketable securities during the years ended December 31, 2019 and 2018 are summarized as follows: Silver One Resources Inc. Gainey Capital Corp. Other Marketable Securities Total Balance as at December 31, 2018 $ 990 $ - $ 1,607 $ 2,597 Additions 60 171 - 231 Dispositions (1,758 ) - - (1,758 ) Gain (loss) recorded in other comprehensive loss 708 (97 ) 94 705 Balance as at December 31, 2019 $ - $ 74 $ 1,701 $ 1,775 Silver One Resources Inc. Gainey Capital Corp. Other Marketable Securities Total Balance as at December 31, 2017 $ 2,280 $ - $ 1,997 $ 4,277 Loss recorded in other comprehensive loss (1,290 ) - (390 ) (1,680 ) Balance as at December 31, 2018 $ 990 $ - $ 1,607 $ 2,597 The Company holds marketable securities of publicly traded companies as strategic investments and has less than a 10% equity interest in each of the investees. During the year ended December 31, 2019, the Company sold 6,250,000 common shares of Silver One Resources Inc. for net proceeds of $1,750 with original cost of $6,360, and realized a cumulative loss on sale of $4,610 in other comprehensive loss.

MINERAL PROPERTIES

MINERAL PROPERTIES	12 Months Ended
	Dec. 31, 2019
Mineral Properties
MINERAL PROPERTIES	As at December 31, 2019 and December 31, 2018, the Company has capitalized the following acquisition, exploration and evaluation costs on its mineral properties: Balance December 31, 2018 Concessions, taxes, and royalties Salaries and share-based payments Drilling, exploration, and technical consulting Assaying, field supplies, and environmental Travel and other expenditures Option payments received and expenditures recovered Currency translation adjustments Disposal or write-down of mineral properties Balance December 31, 2019 Springpole $ 73,378 $ 347 $ 950 $ 1,058 $ 488 $ 554 $ - $ - $ - $ 76,775 Goldlund 96,604 3 726 1,085 240 236 - - - 98,894 Hope Brook 19,581 20 213 105 41 111 - - - 20,071 Cameron 27,032 56 87 126 16 57 - - - 27,374 Pickle Crow 16,754 31 88 46 2,376 18 (50 ) - - 19,263 Duquesne 5,091 2 3 35 1 1 - - - 5,133 Pitt 2,082 - - 2 - - - - - 2,084 Others(1) 2,559 3 17 27 8 1 - - - 2,615 Canada Total $ 243,081 $ 462 $ 2,084 $ 2,484 $ 3,170 $ 978 $ (50 ) $ - $ - $ 252,209 Miranda - - - - - - - - - - Socorro - - - - - - - - - - San Ricardo - - - - - - - - - - Las Margaritas 244 43 22 34 - - (179 ) (10 ) - 154 Others(2) - - - - - - - - - - Mexico Total $ 244 $ 43 $ 22 $ 34 $ - $ - $ (179 ) $ (10 ) $ - $ 154 USA 804 46 - - - - (25 ) (32 ) (341 ) 452 Total $ 244,129 $ 551 $ 2,106 $ 2,518 $ 3,170 $ 978 $ (254 ) $ (42 ) $ (341 ) $ 252,815 Balance December 31, 2017 Concessions, taxes, and royalties Salaries and share-based payments Drilling, exploration, and technical consulting Assaying, field supplies, and environmental Travel and other expenditures Option payments received and expenditures recovered Currency translation adjustments Disposal or write-down of mineral properties Balance December 31, 2018 Springpole $ 70,398 $ 237 $ 1,048 $ 657 $ 479 $ 559 $ - $ - $ - $ 73,378 Goldlund 93,807 2 928 1,045 596 226 - - - 96,604 Hope Brook 18,665 123 459 136 116 82 - - - 19,581 Cameron 26,676 39 193 57 39 28 - - - 27,032 Pickle Crow 16,496 50 92 58 36 22 - - - 16,754 Duquesne 5,053 6 4 27 - 1 - - - 5,091 Pitt 2,080 - - 1 - 1 - - - 2,082 Others(1) 2,515 2 10 21 9 2 - - - 2,559 Canada Total $ 235,690 $ 459 $ 2,734 $ 2,002 $ 1,275 $ 921 $ - $ - $ - $ 243,081 Miranda 810 48 18 9 1 - - 76 (962 ) - Socorro 782 107 3 4 - - - 77 (973 ) - San Ricardo 969 140 1 6 - 4 - 96 (1,216 ) - Las Margaritas 183 41 4 25 4 1 (33 ) 19 - 244 Others(2) 739 195 7 7 - 1 - 81 (1,030 ) - Mexico Total $ 3,483 $ 531 $ 33 $ 51 $ 5 $ 6 $ (33 ) $ 349 $ (4,181 ) $ 244 USA 698 43 - - - - - 63 - 804 Total $ 239,871 $ 1,033 $ 2,767 $ 2,053 $ 1,280 $ 927 $ (33 ) $ 412 $ (4,181 ) $ 244,129 (1) Other mineral properties in Canada as at December 31, 2019 and December 31, 2018 include the mining claims and concessions located in the Township of Duparquet, Quebéc, which are near the Company’s Duquesne gold project and the Duparquet gold project (in which the Company holds a 10% indirect interest). (2) Other mineral properties in Mexico as at December 31, 2019 and December 31, 2018 include Puertecitos, Los Tamales, Geranio, El Apache, El Roble, Batacosa and Lachatao. A write-down of these properties to $nil was recorded during the year ended December 31, 2018. The Company has various underlying agreements and commitments with respect to its Canadian mineral properties, which define annual or future payments in connection with royalty buy-backs or maintenance of property interests. Subsequent to the end of the year, on January 27, 2020, the Company entered into a binding term sheet (the “Term Sheet”) with Auteco Minerals Ltd (“Auteco”) whereby Auteco may earn up to an 80% interest in the Pickle Crow project (the “Earn-In”). On March 12, 2020, the Company and Auteco executed a definitive Earn-In Agreement (the “Earn-In Agreement”), which replaced the Term Sheet. Pursuant to the Earn-In Agreement, Auteco can earn a full 80% equity interest in the PC Gold, the entity which owns the Pickle Crow Project by (a) incurring a total of $10,000 in exploration expenditures over five years, (b) making cash payments to First Mining totaling $4,100 (of which the Company has received $100 to date), and (c) issuing 125 million shares of Auteco to First Mining. First Mining will also retain a 2% Net Smelter Returns (“NSR”) Royalty, 1% of which can be bought back for USD $2,500,000. During the term of the Earn-In Agreement, Auteco will be responsible for all program costs. On August 21, 2019, the Company entered into an option agreement (the “Momentum Option Agreement”) with Momentum Minerals Ltd. (“Momentum”), a private company, granting Momentum the right to earn a 100% interest in First Mining’s Turquoise Canyon property (“Turquoise Canyon”) located in Nevada, U.S. Under the terms of the Momentum Option Agreement, Momentum can elect to make either annual share or cash payments to the Company for aggregate consideration of $500 over the four year option period. In addition, as per the terms of the Momentum Option Agreement, beginning in 2020, Momentum will also be responsible for paying all annual concession tax payments with respect to Turquoise Canyon to the Nevada State land management authorities. In addition to the payment terms outlined above, Momentum will be required to incur exploration expenditures on Turquoise Canyon totaling $750 over the four-year option period, incurring at least $50 in year one and $100 in year two. Upon completion of all payment and expenditure obligations, Momentum will obtain 100% ownership of Turquoise Canyon and First Mining will retain a 2% NSR royalty. Momentum will have the right to buy back 1% of the NSR royalty for $1,000 up until the first anniversary of the commencement of commercial production at Turquoise Canyon. During the year December 31, 2019, the Company received initial consideration in cash of $25 under the terms of the Momentum Option Agreement and recorded a write-down of Turquoise Canyon amounting to $341 (2018 - $nil), based on the recoverable amount indicated by the Momentum Option Agreement. As at December 31, 2019, the carrying value of the Turquoise Canyon property is $452 (December 31, 2018 - $804). On July 30, 2018, the Company entered into an option agreement (the “Gainey Option Agreement”) with Gainey Capital Corp. (“Gainey”), granting Gainey the right to earn a 100% interest in First Mining’s Las Margaritas gold project (“Las Margaritas”) located in the State of Durango in Mexico. Under the terms of the Gainey Option Agreement, Gainey can elect to make either annual share or cash payments to the Company for aggregate consideration of between $900 and $1,015 over the four year option period. In addition, as per the terms of the Gainey Option Agreement, Gainey will make annual payments of USD$25,000 in September 2018 (paid), September 2019 (remains unpaid), September 2020 and USD$250,000 in September 2021 in connection with an existing agreement on Las Margaritas, and exploration expenditures totaling USD$1,000,000 over the four year option period on Las Margaritas. Upon completion of the four year option period, Gainey obtains a 100% ownership interest in Las Margaritas, except that First Mining will retain a 2% NSR royalty interest, with Gainey having the right to buy back 1% of the NSR royalty interest for USD$1,000,000 up until the first anniversary of the commencement of commercial production at Las Margaritas. During the year ended December 31, 2019, the Company received initial consideration in the form of Gainey shares with a fair value of $171 on the date of receipt and cash of $12 relating to value-added tax in Mexico under the terms of the Gainey Option Agreement. As at December 31, 2019, the carrying value of the Las Margaritas property is $154 (December 31, 2018 - $244).

MINERAL PROPERTY INVESTMENTS

MINERAL PROPERTY INVESTMENTS	12 Months Ended
	Dec. 31, 2019
Mineral Property Investments
MINERAL PROPERTY INVESTMENTS	Mineral property investments (which comprise equity interests in the shares of three private companies) are designated as fair value through other comprehensive income (loss) (“FVTOCI”), with changes in fair value recorded in other comprehensive income (loss). As there is no observable market data which can be used to determine this fair value, management uses property specific and market based information to determine whether a significant change in the fair value of these investments has occurred. Factors that are considered include: · Changes in the economic and regulatory environment for the jurisdiction in which the Duparquet Gold project is located; · Gold spot prices over the period from the acquisition of the investment to December 31, 2019; · The company’s market capitalization per in-situ ounce which are attributable to the Duparquet Gold project; and · Recent transactions involving mineral properties located in Quebec. The Company, through its subsidiary Clifton, has a 10% equity interest in the shares of Beattie Gold Mines Ltd., 2699681 Canada Ltd., and 2588111 Manitoba Ltd which directly or indirectly own various mining concessions and surface rights, collectively known as the Duparquet gold project. As at December 31, 2019, management determined, as a function of the rising gold price environment, that there was an increase in the fair value of mineral property investments and a fair value gain of $981 was recorded (December 31, 2018 - $nil) (Note 18). As at December 31, 2019, the fair value of the Company’s mineral property investments is $5,398 (December 31, 2018 - $4,417).

RIGHT-OF-USE ASSET AND LEASE LI

RIGHT-OF-USE ASSET AND LEASE LIABILITY	12 Months Ended
	Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [abstract]
RIGHT-OF-USE-ASSET AND LEASE LIABILITY	In December 2019, the Company entered into a 5-year lease agreement to use office space. The Company has recorded this lease as a right-of-use asset and lease liability in the statement of financial position as a December 31, 2019. At the commencement date of the lease, the lease liability was measured at the present value of the lease payments. The lease payments are discounted using an interest rate of 10%, which is the Company’s incremental borrowing rate. Right-of-Use Asset Lease Liability Current portion Non-current portion Balance as at December 31, 2018 $ - $ - Present value of future lease payments 648 94 554 Balance as at December 31, 2019 $ 648 $ 94 $ 554 Maturity analysis – contractual undiscounted cash flows: As at December 31, 2019 December 31, 2018 Less than one year $ 149 $ - One to five years 678 - More than five years - - Total undiscounted lease liability $ 827 $ -

ACCOUNTS PAYABLE AND ACCRUED LI

ACCOUNTS PAYABLE AND ACCRUED LIABILITIES	12 Months Ended
	Dec. 31, 2019
Trade and other payables [abstract]
ACCOUNTS PAYABLE AND ACCRUED LIABILITIES	Category December 31, 2019 December 31, 2018 Accounts payable $ 768 $ 341 Other accrued liabilities 630 241 Total $ 1,398 $ 582

ENVIRONMENTAL RECLAMATION PROVI

ENVIRONMENTAL RECLAMATION PROVISION	12 Months Ended
	Dec. 31, 2019
Environmental Reclamation Provision
ENVIRONMENTAL RECLAMATION PROVISION	The Company has an obligation to undertake decommissioning, restoration, rehabilitation and environmental work when environmental disturbance is caused by the exploration and development of a mineral property. As at December 31, 2019, the Company estimates that the fair value of the environmental reclamation provision for the Pickle Crow Gold Project is $2,355 (December 31, 2018 - $nil). The fair value of the liability was estimated based on management’s interpretation of current regulatory requirements and is recognized at the present value of such costs. The amount was recorded in the “Assaying, field supplies, and environmental” category in Mineral Properties per Note 6. The undiscounted balance of the estimated cash flows is $2,334 in 2019 dollars. The recorded amount has been measured using a risk free discount rate of 1.67% based on a Canadian government bond and an inflation rate of 2%. The cash outflows in respect of the provision are expected to occur over the next nine years. Current portion Non-current portion Total Balance as at December 31, 2018 $ - $ - $ - Present value of environmental reclamation provision 716 1,639 2,355 Balance as at December 31, 2019 $ 716 $ 1,639 $ 2,355

SHARE CAPITAL

SHARE CAPITAL	12 Months Ended
	Dec. 31, 2019
Disclosure of classes of share capital [abstract]
SHARE CAPITAL	a) Authorized Unlimited number of common shares with no par value. Unlimited number of preferred shares with no par value. b) Issued and Fully Paid Common shares: 591,997,138 (December 31, 2018 – 558,316,916). Preferred shares: nil (December 31, 2018 – nil). On December 18, 2019, the Company completed a non-brokered private placement raising aggregate gross proceeds of $1,999 (the “December Offering”). Pursuant to the December Offering, the Company issued 7,405,000 common shares of the Company (the “Flow-Through Shares”) that qualify as flow-through shares for purposes of the ITA, at a price of $0.27 per Flow-Through Share. In connection with the December Offering, the Company paid a 5% finder’s fee on the aggregate gross proceeds in common shares, resulting in the issuance of an additional 370,250 common shares of the Company with fair value of $85, and shares issuance costs of $11 in cash. An amount of $1,692 was recorded in share capital, and the remaining $296, representing the implied premium, was recorded as a flow-through share premium liability (Note 12). On May 16, 2019, the Company completed a non-brokered private placement raising aggregate gross proceeds of $7,411 (the “May Offering”). Pursuant to the May Offering, the Company issued 20,412,995 units of the Company (the "Units") at a price of $0.27 per Unit for gross proceeds of $5,511 and 5,277,777 flow-through units of the Company (the "FT Units") at a price of $0.36 per FT Unit for gross proceeds of $1,900. In connection with the May Offering, the Company paid units issuance costs of $141 in cash. Net proceeds after issuance costs was $7,270. Each Unit consisted of one common share of the Company and one-half of one common share purchase warrant (each whole common share purchase warrant, a "Warrant"). Each Warrant entitles the holder to acquire one common share of the Company until May 16, 2022 at a price of $0.40. Each FT Unit consists of one flow-through common share of the Company that qualifies as a "flow-through share" for the purposes of the ITA and one-half of one Warrant on the same terms as the Warrants forming part of the Units. An amount of $5,798 was recorded in share capital. The Warrants were valued at $997 using the relative fair value method, and the remaining $475, representing the implied premium, was recorded as a flow-through share premium liability (Note 12). c) Warrants The movements in warrants during the years ended December 31, 2019 and 2018 are summarized as follows: Number Weighted average exercise price Balance as at December 31, 2017 49,693,409 $ 0.81 Warrants exercised (5,131,300 ) 0.17 Warrants expired (24,445,254 ) 0.80 Balance as at December 31, 2018 20,116,855 $ 0.99 Warrants issued 12,845,383 0.40 Warrants exercised (214,200 ) 0.20 Warrants expired (16,875,040 ) 1.10 Balance as at December 31, 2019 15,872,998 $ 0.41 The following table summarizes information about warrants outstanding as at December 31, 2019: Exercise price Number of warrants outstanding Weighted average exercise price ($ per share) Weighted average remaining life (years) $ 0.40 12,845,383 $ 0.40 2.38 $ 0.44 3,027,615 $ 0.44 1.46 15,872,998 $ 0.41 2.20 The Warrants issued in 2019 have been valued at $997 ($1,018 net of allocated issuance costs of $21) using the Black-Scholes option pricing model with the following assumptions: Risk-free interest rate 1.55 % Expected life (years) 3.00 years Expected volatility(1) 67.22 % Expected dividend yield Nil d) Stock Options The Company has adopted a stock option plan that allows for the granting of stock options to Directors, Officers, employees and certain consultants of the Company for up to 10% of the Company’s issued and outstanding common shares. Stock options granted under the plan may be subject to vesting provisions as determined by the Board of Directors. The movements in stock options during the years ended December 31, 2019 and 2018 are summarized as follows: Number Weighted average exercise price Balance as at December 31, 2017 30,608,000 $ 0.74 Granted – January 15, 2018 9,575,000 0.60 Granted – April 16, 2018 120,000 0.50 Granted – July 20, 2018 50,000 0.43 Granted – October 16, 2018 1,400,000 0.40 Granted – December 10, 2018 12,075,000 0.40 Options exercised (638,000 ) 0.17 Options expired (1,950,000 ) 1.27 Options forfeited (2,975,000 ) 0.68 Balance as at December 31, 2018 48,265,000 $ 0.61 Granted – January 7, 2019 5,000,000 0.40 Granted – April 1, 2019 750,000 0.40 Granted – April 29, 2019 2,000,000 0.40 Options expired (7,700,000 ) 0.68 Options forfeited (1,387,500 ) 0.50 Balance as at December 31, 2019 46,927,500 $ 0.57 The weighted average closing share price at the date of exercise for the year ended December 31, 2019 was $nil (December 31, 2018 – $0.38). No stock options were exercised during the year ended December 31, 2019 (December 31, 2018 – 638,000). The following table summarizes information about the stock options outstanding as at December 31, 2019: Options Exercisable Exerciseprice Number of options Weighted average exercise price ($ per share) Weighted average remaining life (years) Number of options Weighted average exercise price ($ per share) Weighted average remaining life (years) $ 0.01 – 0.50 24,442,500 $ 0.40 3.39 17,876,875 $ 0.39 3.15 $ 0.51 – 1.00 22,485,000 0.75 2.14 22,485,000 0.75 2.14 46,927,500 $ 0.57 2.79 40,361,875 $ 0.59 2.59 During the year ended December 31, 2019, there were 7,750,000 (December 31, 2018 – 23,220,000) stock options granted with an aggregate fair value of $1,550 (December 31, 2018 – $5,116), or a weighted average fair value of $0.20 per option (December 31, 2018 – $0.22). As at December 31, 2019, 6,565,625 (December 31, 2018 – 9,056,250) stock options remain unvested with an aggregate grant date fair value of $392 (December 31, 2018 - $876). Certain stock options granted were directly attributable to exploration and evaluation expenditures on mineral properties and were therefore capitalized to mineral properties. In addition, certain stock options were subject to vesting provisions. These two factors result in differences between the aggregate fair value of stock options granted and total share-based payments expensed during the periods. Total share-based payments expense during the years ended December 31, 2019 and 2018 was classified within the financial statements as follows: For the year ended December 31, Statements of Net Loss: 2019 2018 General and administration $ 824 $ 2,254 Exploration and evaluation 143 106 Investor relations and marketing communications 325 437 Corporate development and due diligence 304 235 Subtotal $ 1,596 $ 3,032 For the year ended December 31, Statements of Financial Position: 2019 2018 Mineral Properties $ 572 $ 1,169 Total $ 2,168 $ 4,201 The grant date fair value of the stock options recognized in the period has been estimated using the Black-Scholes option pricing model with the following weighted average assumptions: Year ended Year ended December 31, 2019 December 31, 2018 Risk-free interest rate 2.20 % 1.91 % Share price at grant date (in dollars) $ 0.36 $ 0.41 Exercise price (in dollars) $ 0.40 $ 0.48 Expected life (years) 5.00 years 5.00 years Expected volatility(1) 71.86 % 70.87 % Forfeiture rate 5.00 % 2.64 % Expected dividend yield Nil Nil (1) The computation of expected volatility prior to the December 10, 2018 option grant was based on the historical volatility of comparable companies from a representative peer group of publicly traded mineral exploration companies. Commencing December 10, 2018, the computation of expected volatility was based on the Company’s historical price volatility, over a period which approximates the expected life of the option.

FLOW-THROUGH SHARE PREMIUM LIAB

FLOW-THROUGH SHARE PREMIUM LIABILITY	12 Months Ended
	Dec. 31, 2019
Flow-through Share Premium Liability
FLOW-THROUGH SHARE PREMIUM LIABILITY	The following is a continuity schedule of the liability portion of the Company’s flow-through share issuances: May 16, 2019 December 18, 2019 Total Balance, December 31, 2018 $ - $ - $ - Liability incurred on flow-through shares issued May 16, 2019 475 - 475 Settlement of flow-through share premium liability upon incurring eligible expenditures (430 ) - (430 ) Liability incurred on flow-through shares issued December 18, 2019 - 296 296 Balance, December 31, 2019 $ 45 $ 296 $ 341 As at December 31, 2019, the Company had $2,178 (December 31, 2018 - $nil) of flow-through expenditure commitments to fulfill the flow-through requirements. The Company reversed the associated flow-through share premium liability and recognized a deferred income tax recovery of $430 in the Company’s consolidated financial statements for the year ended December 31, 2019.

OPERATING EXPENSES

OPERATING EXPENSES	12 Months Ended
	Dec. 31, 2019
Operating Expenses (Note 13)
OPERATING EXPENSES	Components by nature of the Company’s functional operating expense categories are as follows: For the year ended December 31, 2019 General and administration Exploration and evaluation Investor relations and marketing communications Corporate development and due diligence Total Administrative and office $ 424 $ 136 $ 21 $ 2 $ 583 Consultants 108 211 29 - 348 Depreciation 14 157 - - 171 Directors fees 277 - - - 277 Exploration and evaluation - 40 - - 40 Investor relations and marketing communications 1 8 592 - 601 Professional fees 614 5 - - 619 Salaries 899 329 175 179 1,582 Share-based payments (non-cash) (Note 11(d)) 824 143 325 304 1,596 Transfer agent and filing fees 193 - 1 - 194 Travel and accommodation 60 95 34 32 221 Operating expenses total $ 3,414 $ 1,124 $ 1,177 $ 517 $ 6,232 Write-down of mineral properties (non-cash) (Note 6) 341 Loss from operational activities $ 6,573 For the year ended December 31, 2018 General and administration Exploration and evaluation Investor relations and marketing communications Corporate development and due diligence Total Administrative and office $ 501 $ 139 $ 33 $ 5 $ 678 Consultants 62 72 17 - 151 Depreciation 11 193 - - 204 Directors fees 143 - - - 143 Exploration and evaluation - 1 - - 1 Investor relations and marketing communications 7 7 803 2 819 Professional fees 342 - - - 342 Salaries 1,110 145 228 238 1,721 Share-based payments (non-cash) (Note 11(d)) 2,254 106 437 235 3,032 Transfer agent and filing fees 162 - 8 - 170 Travel and accommodation 100 101 108 25 334 Operating expenses total $ 4,692 $ 764 $ 1,634 $ 505 $ 7,595 Write-down of mineral properties (non-cash) (Note 6) 4,181 Loss from operational activities $ 11,776

SEGMENT INFORMATION

SEGMENT INFORMATION	12 Months Ended
	Dec. 31, 2019
Disclosure of operating segments [abstract]
SEGMENT INFORMATION	The Company operates in a single reportable operating segment, being the acquisition, exploration, and development of North American mineral properties. Geographic information about the Company’s non-current assets, excluding financial instruments, as at December 31, 2019 and December 31, 2018 is as follows: Non-current assets December 31, 2019 December 31, 2018 Canada $ 253,587 $ 243,854 Mexico 252 334 USA 454 809 Total $ 254,293 $ 244,997

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2019
Income Taxes
INCOME TAXES	Taxation in the Company and its subsidiaries’ operational jurisdictions is calculated at the rate prevailing in the respective jurisdictions. The reconciliation of income taxes calculated at the applicable Canadian federal and provincial statutory rates to the actual income tax expense (recovery) is as follows: Year ended December 31, 2019 Year ended December 31, 2018 Net loss before income tax $ 6,443 $ 11,645 Combined Canadian statutory income tax rate 27.00 % 27.00 % Income tax recovery computed at statutory income tax rate 1,740 3,144 Tax effect of: Permanent differences (678 ) (599 ) Difference in tax rates in foreign jurisdictions (17 ) 128 Changes in estimate and others 124 (539 ) Flow-through share premium liability 430 - Changes in unrecognized deferred tax assets (2,115 ) (2,134 ) Income tax expense $ (516 ) $ - Deferred tax assets and liabilities are offset if they relate to the same taxable entity and same taxation authority. No deferred tax asset has been recognized in respect to the losses and temporary differences below, as it is not considered probable that sufficient future taxable profit will allow the deferred tax asset to be recovered. Recognized deferred income tax assets (liabilities) are comprised of: December 31, 2019 December 31, 2018 Non-capital loss carryforwards $ 1,162 $ 64 Property and equipment - 4 Mineral properties (1,978) (68) Mineral property investments (130) - Total $ (946) $ - Deferred tax assets have not been recognized in respect of the following items: December 31, 2019 December 31, 2018 Non-capital loss carryforwards $ 26,403 $ 24,172 Net capital loss carryforwards 763 1,580 Investment tax credits 3,857 3,857 Undeducted financing costs 41 77 Marketable securities 83 830 Property and equipment 304 261 Environmental reclamation provision 624 - Mineral properties 2,242 1,417 Total $ 34,317 $ 32,194 As at December 31, 2019, the Company and its subsidiaries had unrecognized Canadian non-capital loss carryforwards of approximately $99,214 (2018 - $87,300) which expire between the years 2026 and 2039, unrecognized Canadian net capital loss carryforwards of approximately $2,827 (2018 - $5,900) which can be carried forward indefinitely, unrecognized Canadian investment tax credits of approximately $5,282 (2018 - $5,282) which expire between the years 2024 and 2033, and unrecognized Mexican non-capital loss carryforwards of approximately $1,900 (2018 - $1,603) which expire between the years 2019 and 2029.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	12 Months Ended
	Dec. 31, 2019
Related party transactions [abstract]
RELATED PARTY TRANSACTIONS	Key management includes the Directors and Officers of the Company. The compensation paid or payable to key management for services during the years ended December 31, 2019 and 2018 is as follows: Service or Item Year ended December 31, 2019 2018 Directors’ fees $ 277 $ 143 Salaries and consultants’ fees 1,188 1,208 Severance payments - 410 Share-based payments (non-cash) 1,601 2,991 Total $ 3,066 $ 4,752

SUPPLEMENTAL CASH FLOW INFORMAT

SUPPLEMENTAL CASH FLOW INFORMATION	12 Months Ended
	Dec. 31, 2019
Supplemental Cash Flow Information
SUPPLEMENTAL CASH FLOW INFORMATION	During the year ended December 31, 2019, the significant non-cash investing and financing transactions were as follows: ● 370,250 shares issued as finder’s fee in connection with December 18, 2019 private placement (Note 11); and ● Received Gainey shares with a fair value of $171 under the terms of the Gainey Option Agreement (Note 6). During the year ended December 31, 2018, significant non-cash investing and financing transactions were as follows: ● Paid or accrued $nil for income taxes.

FAIR VALUE

FAIR VALUE	12 Months Ended
	Dec. 31, 2019
Disclosure of fair value measurement of assets [abstract]
FAIR VALUE	Fair values have been determined for measurement and/or disclosure purposes based on the following methods. The Company characterizes fair value measurements using a hierarchy that prioritizes inputs depending on the degree to which they are observable. The three levels of the fair value hierarchy are as follows: ● Level 1: fair value measurements are quoted prices (unadjusted) in active markets for identical assets or liabilities; ● Level 2: fair value measurements are those derived from inputs other than quoted prices included within level 1 that are observable for the asset or liability, either directly (i.e. as prices) or indirectly (i.e. derived from prices); and ● Level 3: fair value measurements are those derived from valuation techniques that include significant inputs for the asset or liability that are not based on observable market data (unobservable inputs). The carrying values of cash and cash equivalents, current accounts and other receivables, and accounts payable and accrued liabilities approximated their fair values because of the short-term nature of these financial instruments. These financial instruments are classified as financial assets and liabilities at amortized cost. The carrying value of the non-current reclamation deposit approximated its fair values as the amount is represented by cash deposit. This financial instrument is classified as financial asset at amortized cost. The carrying value of marketable securities was based on the quoted market prices of the shares as at December 31, 2019 and was therefore considered to be Level 1. These financial instruments are classified as financial assets at FVTOCI. The mineral property investments (First Mining’s 10% equity interest in three privately held companies that own the Duparquet Gold Project) are classified as financial assets at FVTOCI. The carrying value of the mineral property investments was not based on observable market data and was therefore considered to be Level 3. The initial fair value of the mineral property investments was determined based on attributable pro-rata gold ounces for the Company’s 10% indirect interest in the Duparquet project, which formed part of the identifiable assets from the acquisition of Clifton. Subsequently, the fair value has been reassessed at each period end. Scenarios which may result in a significant change in fair value include, among others, a change in the performance of the investee, a change in the performance of comparable entities, a change in gold price, a change in the economic environment, or evidence from external transactions in the investee’s equity. During the year ended December 31, 2019, management concluded that there was an increase in the fair value of the mineral property investments, and a fair value gain of $981 (December 31, 2018 - $nil) was recorded (Note 7). The following table presents the Company’s fair value hierarchy for financial assets that are measured at fair value: December 31, 2019 December 31, 2018 Fair value measurement Fair value measurement Carrying value Level 1 Level 3 Carrying value Level 1 Level 3 Financial assets: Marketable securities (Note 5) $ 1,775 $ 1,775 $ - $ 2,597 $ 2,597 $ - Mineral property investments (Note 7) 5,398 - 5,398 4,417 - 4,417 Total $ 7,173 $ 1,775 $ 5,398 $ 7,014 $ 2,597 $ 4,417 None of the Company’s financial liabilities are subsequently measured at fair value after initial recognition. During the year ended December 31, 2019 there have been no transfers of amounts between Level 1, Level 2, and Level 3 of the fair value hierarchy. The classification of the financial instruments as well as their carrying values as at December 31, 2019 and 2018 is shown in the table below: At December 31, 2019 Amortized Cost (Financial assets) FVTOCI(1) Amortized Cost (Financial liabilities) Total Financial assets: Cash and cash equivalents $ 5,902 $ - $ - $ 5,902 Current accounts and other receivables 97 - - 97 Marketable securities - 1,775 - 1,775 Mineral property investments - 5,398 - 5,398 Reclamation deposit 119 - - 119 Total financial assets $ 6,118 $ 7,173 $ - $ 13,291 Financial liabilities: Accounts payable and accrued liabilities $ - $ - $ 1,398 $ 1,398 At December 31, 2018 Amortized Cost (Financial assets) FVTOCI(1) Amortized Cost (Financial liabilities) Total Financial assets: Cash and cash equivalents $ 5,115 $ - $ - $ 5,115 Current accounts and other receivables 17 - - 17 Marketable securities - 2,597 - 2,597 Mineral property investments - 4,417 - 4,417 Reclamation deposit 116 - - 116 Total financial assets $ 5,248 $ 7,014 $ - $ 12,262 Financial liabilities: Accounts payable and accrued liabilities $ - $ - $ 582 $ 582 (1) The Company made an irrevocable election to reclassify marketable securities and mineral property investments fair value remeasurements from FVTPL to FVTOCI.

FINANCIAL AND CAPITAL RISK MANA

FINANCIAL AND CAPITAL RISK MANAGEMENT	12 Months Ended
	Dec. 31, 2019
Financial And Capital Risk Management
FINANCIAL AND CAPITAL RISK MANAGEMENT	The Company thoroughly examines the various financial instruments and risks to which it is exposed and assesses the impact and likelihood of those risks. These risks include market risk, price risk, foreign currency risk, interest rate risk, credit risk, liquidity risk, and capital risk. Where material, these risks are reviewed and monitored by the Board of Directors. The Board of Directors has overall responsibility for the determination of the Company’s risk management objectives and policies. The overall objective of the Board is to set policies that seek to reduce risk as far as possible without unduly affecting the Company’s competitiveness and flexibility. a) Market Risk Market risk is the risk that the fair value of future cash flows of a financial instrument will fluctuate due to changes in market prices. Market risk includes equity price risk, foreign currency risk and interest rate risk. Equity Price Risk The Company is exposed to equity price risk as a result of holding investments in equity securities, which are comprised of marketable securities and mineral property investments, in other mineral property exploration companies. If the fair value of our investments in equity instruments had been 10% higher or lower as at December 31, 2019, other comprehensive loss for the year ended December 31, 2019 would have decreased or increased, respectively, by approximately $717 (2018 – $701), as a result of changes in the fair value of equity investments. Foreign Currency Risk The Company is exposed to the financial risk related to the fluctuation of foreign exchange rates. The Company operates in Canada, the United States, and Mexico and a portion of the Company’s expenses are incurred in Canadian dollars (“CAD”), US dollars (“USD”), and Mexican Pesos (“MXN”). A significant change in the currency exchange rates between the Canadian, US and Mexican currencies, could have an effect on the Company’s results of operations, financial position or cash flows. The Company has not hedged its exposure to currency fluctuations. As at December 31, 2019, the Company is exposed to currency risk on certain financial instruments denominated in USD and MXN. The Company does not have significant transactions or hold significant cash or other financial instruments denominated in USD and MXN currencies. Therefore, the Company considers this risk to be immaterial. Interest Rate Risk Interest rate risk is the risk that future cash flows will fluctuate as a result of changes in market interest rates. The Company does not have any borrowings that are subject to fluctuations in market interest rate. Interest rate risk is limited to potential decreases on the interest rate offered on cash and cash equivalents held with chartered Canadian financial institutions. The Company manages its interest rate risk by maximizing the interest income earned on excess funds while maintaining the necessary liquidity to conduct its day-to-day operations. The Company considers this risk to be immaterial. b) Credit Risk Credit risk is the risk of financial loss to the Company if a customer or counterparty to a financial instrument fails to meet its contractual obligations. Financial instruments which are potentially subject to credit risk for the Company consist primarily of cash and cash equivalents, accounts and other receivables, and the reclamation deposit. The Company considers credit risk with respect to its cash and cash equivalents to be immaterial as cash and cash equivalents are mainly held through high credit quality major Canadian financial institutions as determined by ratings agencies. As a result, the Company does not expect any credit losses. c) Liquidity Risk Liquidity risk is the risk that the Company will not be able to meet its financial obligations as they become due. The Company’s policy is to ensure that it will have sufficient cash to allow it to meet its liabilities when they become due, under both normal and stressed conditions, without incurring unacceptable losses or risking damage to the Company’s reputation. The Company manages its liquidity risk by preparing annual estimates of exploration and administrative expenditures and monitoring actual expenditures compared to the estimates to ensure that there is sufficient capital on hand to meet ongoing obligations. The following table summarizes the maturities of the Company’s financial liabilities as at December 31, 2019 based on the undiscounted contractual cash flows: Carrying Amount Contractual Cash Flows Less than 1 year 1 – 3 years 4 – 5 years After 5 years Accounts payable and accrued liabilities $ 1,398 $ 1,398 $ 1,398 $ - $ - $ - Lease liability 648 827 149 496 182 - As at December 31, 2019, the Company held cash and cash equivalents of $5,902 (December 31, 2018 - $5,115). The Company believes it has sufficient cash on hand to meet operating requirements as they arise for at least the next 12 months. d) Capital Risk Management The Company’s objectives when managing capital are to safeguard the Company’s ability to continue as a going concern in order to pursue the exploration and retention of its mineral properties. The Company has historically demonstrated the ability to raise new capital through equity issuances and/or through surplus cash as part of its acquisitions. In the management of capital, the Company includes the components of shareholders’ equity as well as cash. The Company prepares annual estimates of exploration and administrative expenditures and monitors actual expenditures compared to the estimates to ensure that there is sufficient capital on hand to meet ongoing obligations.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
	Dec. 31, 2019
Disclosure of non-adjusting events after reporting period [abstract]
SUBSEQUENT EVENTS	Private Placement Equity Financing with Ausenco First Mining has entered into an agreement with Ausenco Engineering Canada Inc. (“Ausenco”) to complete a Pre-Feasibility Study (“PFS”) for the Company’s Springpole Gold Project. Ausenco or an affiliate will be entitled to receive approximately $1,600 as fees thereunder. Pursuant to the agreement with Ausenco, on January 15, 2020 the Company closed a private placement with Ausenco, for gross cash proceeds of approximately $750 from Ausenco in respect of its subscription for common shares (the “Ausenco Offering”). Pursuant to the Ausenco Offering, First Mining issued 2,777,777 common shares to Ausenco at a price of $0.27 per common share. First Mining then paid $750 to Ausenco as a prepayment for the costs of the PFS. Non-Brokered Private Placement Financing On March 6, 2020, the Company closed the third and final tranche of a non-brokered private placement initially announced on February 6, 2020, pursuant to which it raised aggregate gross proceeds of $8,500 (the “2020 Offering”). Pursuant to the 2020 Offering, the Company issued an aggregate of 27,420,318 units of the Company (the “Units”) at a price of $0.22 per Unit for gross proceeds of $6,000 and 10,000,000 flow-through units of the Company (the “FT Units”) at a price of $0.25 per FT Unit for gross proceeds of $2,500. The 2020 Offering closed in three tranches, with 10,000,000 FT Units issued on February 14, 2020, 23,328,818 Units issued on February 28, 2020 and 4,091,500 Units issued on March 6, 2020. In connection with the 2020 Offering, the Company paid issuance costs of $91 in cash. Each Unit consisted of one common share of the Company and one-half of one common share purchase warrant (each whole common share purchase warrant, a "Warrant"). Each Warrant will entitle the holder to acquire one common share of the Company for a period of 36 months from the date of issuance at a price of $0.33. Each FT Unit consisted of one flow-through common share of the Company that qualifies as a "flow-through share" for the purposes of the ITA and one-half of one Warrant on the same terms as the Warrants forming part of the Units. Stock Options Grant Subsequent to December 31, 2019, the Company granted 8,750,000 incentive stock options to Directors, Officers, employees and consultants of the Company under the terms of its stock option plan. The stock options have an exercise price of $0.25 per share and are exercisable for a period of five years from the grant date. Exercise of Stock Options Subsequent to December 31, 2019 and as at the date of filing these consolidated annual financial statements, a total of 400,000 stock options were exercised for gross proceeds of $60. Stock Options Expired Subsequent to December 31, 2019 and as at the date of filing these consolidated annual financial statements, 1,700,000 stock options expired unexercised. Impacts of COVID-19 Pandemic In March 2020, the World Health Organization declared a global pandemic related to the virus known as COVID-19. The expected impacts on global commerce are anticipated to be far reaching. To date there have been significant stock market declines, and the movement of people and goods has become restricted. The mineral exploration sector is expected to be impacted significantly as many local and regional governments have issued public health orders in response to COVID-19, including restricting the movement of people, which could impact the Company's ability to access its properties and complete its exploration programs in the coming year. A continuing period of lower prices could significantly affect the economic potential of many of the Company’s current properties and may result in the Company ceasing work on, or dropping its interest in, some or all of them. As the Company does not have production activities, the ability to fund ongoing exploration is affected by the availability of financing. Due to market uncertainty the Company may be restricted in its ability to raise additional funding. The impact of these factors on the Company is not yet determinable; however they may have a material impact on the Company’s financial position, results of operations and cash flows in future periods. In particular, there may be heightened risk of mineral property impairment and liquidity or going concern uncertainty. As a result, impairment indicators for our mineral properties and/or a decline in the fair value of our mineral property investment could arise in 2020 if current conditions persist. We continue to work on revisions to our company's forecasts and exploration plans in light of the current conditions and will use these updated assumptions / forecasts in measurement of our assets going forward. As required by IFRS, we have not reflected these subsequent conditions in the measurement of our mineral properties or our mineral property investment as at December 31, 2019.

ACCOUNTING POLICIES (Policies)

ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies
New accounting policy - IFRS 16	The Company has adopted IFRS 16 Leases (“IFRS 16”) which is effective for annual periods beginning on or after January 1, 2019. IFRS 16 specifies how to recognize, measure, present and disclose leases. The standard provides a single lessee accounting model, requiring lessees to recognize a right-of-use asset and a lease liability for all leases unless the lease term is 12 months or less or the underlying asset has a low value. For new leases, the right-of-use asset is initially measured at the amount of the liability plus any initial direct costs. After lease commencement, the lessee shall measure the right-of-use asset at cost less accumulated depreciation and accumulated impairment. A lessee shall either apply IFRS 16 with full retrospective effect or alternatively not restate comparative information but recognise the cumulative effect of initially applying IFRS 16, if any, as an adjustment to opening equity at the date of initial application. The adoption of IFRS 16 did not have an impact on the Company’s consolidated annual financial statements as at the date of adoption. Subsequent to January 1, 2019, the Company entered into a lease agreement which was in scope of IFRS 16 (Note 8).
New accounting policy - Flow-through units and shares	The Company may, from time to time, issue flow-through common shares or units to finance a portion of its Canadian exploration programs. Pursuant to the terms of the flow-through share agreements and the Income Tax Act (Canada) (the “ITA”), these equity instruments transfer the tax deductibility of qualifying resource expenditures to investors. Upon the issuance of a flow-through share, the Company bifurcates the flow-through share into i) fair value of capital stock issued, based on market price at time of issuance, and ii) the residual as a flow-through share premium, which is recognized as a liability. Upon the issuance of a flow-through unit, the Company bifurcates the flow-through unit into i) relative fair value of capital stock issued, ii) relative fair value of a warrant, and iii) the residual as a flow-through share premium, which is recognized as a liability. Upon incurring qualifying expenses the Company derecognizes the flow-through share premium liability and recognizes a credit to deferred tax expense (recovery). Proceeds received from the issuance of flow-through shares are to be used for Canadian resource property exploration expenditures within a certain time period as prescribed by the Government of Canada’s flow-through regulations, as contained in the ITA. The portion of the proceeds received but not yet expended at the end of the Company’s relevant reporting period is disclosed separately in the notes to the financial statements as flow-through expenditure commitments (Note 12). The Company is also subject to Part XII.6 of the ITA, which imposes a tax on flow-through proceeds renounced under the “Look-back Rule”, in accordance with the Government of Canada’s flow-through regulations. When applicable, this tax is accrued until paid.
Financial Instruments	(i) Classification The Company classifies its financial instruments in the following categories: at fair value through profit and loss (“FVTPL”), at fair value through other comprehensive income (loss) (“FVTOCI”) or at amortized cost. The Company determines the classification of financial assets at initial recognition. The classification of debt instruments is driven by the Company’s business model for managing the financial assets and their contractual cash flow characteristics. Equity instruments that are held for trading are classified as FVTPL. For other equity instruments, at the time of acquisition the Company can make an irrevocable election (on an instrument-by-instrument basis) to designate them as at FVTOCI. Financial liabilities are measured at amortized cost, unless they are required to be measured at FVTPL (such as instruments held for trading or derivatives) or the Company has opted to measure them at FVTPL. Upon the adoption of IFRS 9, the Company made an irrevocable election to classify marketable securities and mineral property investments (First Mining’s 10% equity interest in a group of privately held companies that own the Duparquet Gold Project) as FVTOCI given they are not held for trading and are instead held as strategic investments that align with the Company’s corporate objectives. (ii) Measurement Financial assets at FVTOCI Elected investments in equity instruments at FVTOCI are initially recognized at fair value plus transaction costs. Subsequently they are measured at fair value, with gains and losses recognized in other comprehensive income (loss). Financial assets and liabilities at amortized cost Financial assets and liabilities at amortized cost are initially recognized at fair value plus or minus transaction costs, respectively, and subsequently carried at amortized cost less any impairment. Financial assets and liabilities at FVTPL Financial assets and liabilities carried at FVTPL are initially recorded at fair value and transaction costs are expensed in the consolidated statements of net (loss) income. Realized and unrealized gains and losses arising from changes in the fair value of the financial assets and liabilities held at FVTPL are included in the consolidated statements of net (loss) income in the period in which they arise. Where management elected to recognize a financial liability at FVTPL, any changes associated with the Company’s own credit risk will be recognized in other comprehensive income (loss). (iii) Impairment of financial assets at amortized cost The Company recognizes a loss allowance for expected credit losses on financial assets that are measured at amortized cost. At each reporting date, the Company measures the loss allowance for a financial asset at an amount equal to the lifetime expected credit losses if the credit risk on the financial asset has increased significantly since initial recognition. If at the reporting date, the financial asset has not increased significantly since initial recognition, the Company measures the loss allowance for the financial asset at an amount equal to the twelve month expected credit losses. The Company recognizes in the consolidated statements of net (loss) income, as an impairment gain or loss, the amount of expected credit losses (or reversal) that is required to adjust the loss allowance at the reporting date to the amount that is required to be recognized. (iv) Derecognition Financial assets The Company derecognizes financial assets only when the contractual rights to cash flows from the financial assets expire, or when it transfers the financial assets and substantially all of the associated risks and rewards of ownership to another entity. Gains and losses on derecognition are generally recognized in the consolidated statements of net (loss) income. However, gains and losses on derecognition of financial assets classified as FVTOCI remain within accumulated other comprehensive income (loss). Financial liabilities The Company derecognizes financial liabilities only when its obligations under the financial liabilities are discharged, cancelled or expired. Generally, the difference between the carrying amount of the financial liability derecognized and the consideration paid and payable, including any non-cash assets transferred or liabilities assumed, is recognized in the consolidated statements of net (loss) income.
Cash and Cash Equivalents	Cash and cash equivalents include cash and short-term deposits that are readily convertible to known amounts of cash and which are subject to an insignificant risk of changes in value. The carrying amounts approximate fair value due to the short-term maturities of these instruments.
Mineral Properties	Once the legal right to explore a property has been acquired, costs directly related to exploration and evaluation expenditures are recognized and capitalized, in addition to the acquisition costs. These direct expenditures include such costs as mineral concession taxes, option payments, wages and salaries, surveying, geological consulting and laboratory costs, field supplies, travel and administration. Costs not directly attributable to exploration and evaluation activities, including general administrative overhead costs, are expensed in the period in which they are incurred. The Company may occasionally enter into option or royalty arrangements, whereby the Company will transfer part of its mineral properties, as consideration, for an agreement by the transferee to meet certain exploration and evaluation expenditures which would have otherwise been undertaken by the Company. Any cash consideration received from the agreement is credited against the costs previously capitalized to the mineral interest given up by the Company, with any excess cash accounted for as a gain on disposal. The Company assesses exploration and evaluation assets for impairment when facts and circumstances suggest that the carrying amount of an asset may exceed its recoverable amount. The recoverable amount is the higher of the asset’s fair value less costs to sell and value in use. Once the technical feasibility and commercial viability of extracting the mineral resource has been determined, the property is considered to be a mine under development and is classified as ‘mines under construction’. Exploration and evaluation assets are also tested for impairment before the assets are transferred to development properties.
Impairment of Non-Financial Assets	Mineral properties are subject to impairment tests whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. Where the carrying value of an asset exceeds its recoverable amount, which is the higher of value in use and fair value less costs to sell, the asset is written down accordingly. An impairment loss is charged to profit or loss. For the purposes of assessing impairment, assets are grouped at the lowest levels for which there are largely independent cash flows (cash-generating units). As a result, some assets may be tested individually for impairment and some are tested at a cash-generating unit level. Impairment reviews for the Company’s exploration and evaluation stage mineral properties are carried out on a property by property basis, with each property representing a single cash generating unit. An impairment review for an exploration and evaluation asset is undertaken when indicators of impairment arise, but typically when one of the following circumstances apply: ● The right to explore the area has expired or will expire in the near future with no expectation of renewal; ● Substantive expenditure on further exploration for and evaluation of mineral resources in the area is neither planned nor budgeted; ● No commercially viable deposits have been discovered, and the decision had been made to discontinue exploration in the area; and ● Sufficient work has been performed to indicate that the carrying amount of the expenditure carried as an asset will not be fully recovered.
Property and equipment	Property and equipment are recorded at cost less accumulated depreciation and accumulated impairment losses. The initial cost of an asset comprises its purchase price or construction cost, any costs directly attributable to bringing the asset into operation and, where applicable, the initial estimation of any asset retirement obligation. The purchase price or construction cost is the aggregate amount paid and the fair value of any other consideration given to acquire the asset. Depreciation is recognized in profit or loss on a straight-line basis over the following estimated useful lives: Buildings 10 years Machinery and equipment 5 years Furniture and fixtures 5 years Vehicles 5 years Computer equipment 3 years Computer software 1 year Depreciation methods, useful lives and residual values are reviewed at each financial year-end and adjusted if appropriate.
Environmental Reclamation Provision	The Company is subject to various government laws and regulations relating to environmental disturbances caused by exploration and evaluation activities. The present value of the estimated costs of legal and constructive obligations required to restore the exploration sites is recognized in the year in which the obligation is incurred. The nature of the reclamation activities includes restoration and revegetation of the affected exploration sites. When a liability is recognized, the present value of the estimated costs (discounted using a risk-free rate) is capitalized by increasing the carrying amount of the related exploration property. Over time, the discounted liability is increased for the changes in present value based on current market discount rates and liability specific risks. Additional environment disturbances or changes in reclamation costs will be recognized as additions to the corresponding assets and reclamation provision in the year in which they occur.
Income Taxes	Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in net income except to the extent that it relates to a business combination or items recognized directly in equity or in other comprehensive loss. Current income taxes are recognized for the estimated income taxes payable or receivable on taxable income or loss for the current year and any adjustment to income taxes payable in respect of previous years. Current income taxes are determined using tax rates and tax laws that have been enacted or substantively enacted by the year-end date. Deferred tax assets and liabilities are recognized where the carrying amount of an asset or liability differs from its tax base, except for taxable temporary differences arising on the initial recognition of goodwill and temporary differences arising on the initial recognition of an asset or liability in a transaction which is not a business combination and at the time of the transaction affects neither accounting nor taxable profit or loss. Recognition of deferred tax assets for unused tax losses, tax credits and deductible temporary differences is restricted to those instances where it is probable that future taxable profit will be available against which the deferred tax asset can be utilized. At the end of each reporting year the Company reassesses unrecognized deferred tax assets. The Company recognizes a previously unrecognized deferred tax asset to the extent that it has become probable that future taxable profit will allow the deferred tax asset to be recovered.
Share Capital	Equity instruments are contracts that give a residual interest in the net assets of the Company. Financial instruments issued by the Company are classified as equity only to the extent that they do not meet the definition of a financial liability or financial asset. The Company’s common shares are classified as equity instruments. Incremental costs directly attributable to the issue of new shares or options are shown in equity as a deduction, net of tax, from the proceeds. Consideration received from a private placement financing involving units consisting of common shares and warrants is allocated to the share capital and the warrant reserve accounts using the relative fair value method. As prescribed by this method, the consideration is allocated to the value of share capital and warrant reserve on a pro rata basis. The share capital is valued at the closing share price of the Company on the completion date of the private placement and the warrant reserve is valued using the Black-Scholes option pricing model.
Loss per Share	Basic loss per share is calculated by dividing the net loss for the year by the weighted average number of shares outstanding during the year. Diluted loss per share is calculated using the treasury stock method. Under the treasury stock method, the weighted average number of shares outstanding used in the calculation of diluted income or loss per share assumes that the deemed proceeds received from the exercise of stock options, share purchase warrants and their equivalents would be used to repurchase common shares of the Company at the average market price during the year, if they are determined to have a dilutive effect. In periods when the Company has generated a net loss, stock options and share purchase warrants are not included in the computation of diluted loss per share as they are anti-dilutive.
Share-based Payments	Where equity-settled share options are granted to employees, the fair value of the options at the date of grant, measured using the Black-Scholes option pricing model, is charged to the statement of comprehensive loss or capitalized to mineral properties over the vesting period using the graded vesting method. Performance vesting conditions are taken into account by adjusting the number of equity instruments expected to vest at each reporting date so that, ultimately, the cumulative amount recognized over the vesting period is based on the number of options that eventually vest. Charges for options that are forfeited before vesting are reversed from share-based payment reserve. Where equity-settled share options are granted to non-employees, they are measured at the fair value of the goods or services received. However, if the value of goods or services received in exchange for the options cannot be reliably estimated, the options are measured using the Black-Scholes option pricing model. All equity-settled share-based payments are reflected in share-based payment reserve, until exercised. Upon exercise, shares are issued from treasury and the amount reflected in share-based payment reserve is credited to share capital, together with any consideration received.
Segment Reporting	Operating segments are reported in a manner consistent with the internal reporting provided to the chief operating decision-maker. The chief operating decision-maker is responsible for allocating resources and assessing performance of the operating segment.
Critical Accounting Judgments and Estimates	The preparation of financial statements requires the use of accounting estimates. It also requires management to exercise judgment in the process of applying its accounting policies. Estimates and judgments are regularly evaluated and are based on management’s experience and other factors, including expectations about future events that are believed to be reasonable under the circumstances. The use of judgments, estimates and assumptions affects the application of accounting policies and the reported amounts of assets and liabilities, income and expense. Actual results may differ from these estimates. The following discusses accounting policy judgments and the sources of estimation uncertainty that may result in material changes in the carrying amount of assets or liabilities within the next year: (i) Accounting policy judgements Impairment of Mineral Properties In accordance with the Company’s accounting policy for its mineral properties, exploration and evaluation expenditures on mineral properties are capitalized. There is no certainty that the expenditures made by the Company in the exploration of its property interests will result in discoveries of commercial quantities of minerals. The Company applies judgment to determine whether indicators of impairment exist for these capitalized costs. Management uses several criteria in making this assessment, including the period for which the Company has the right to explore, expected renewals of exploration rights, whether substantive expenditures on further exploration and evaluation of mineral properties are budgeted, and evaluation of the results of exploration and evaluation activities up to the reporting date. (ii) Estimation Uncertainty Determining Amount and Timing of Reclamation Provisions A reclamation provision represents the present value of estimated future costs for the reclamation of the Company’s mineral properties. These estimates include assumptions as to the future activities, cost of services, timing of the reclamation work to be performed, inflation rates and interest rates. The actual cost to reclaim a mine or exploration property may vary from the estimated amounts because there are uncertainties with respect to the extent of required future remediation activities, as studies are currently ongoing, and uncertainties in factors used to estimate the cost and potential changes in regulations or laws governing the reclamation of a mineral property. Management periodically reviews the reclamation requirements and adjusts the liability as new information becomes available and will assess the impact of new regulations and laws as they are enacted. Valuation of Mineral Property Investments The Company makes estimates and assumptions that affect the carrying value of its mineral property investments, which are comprised of equity interests in the shares of private companies. These financial assets are designated as fair value through other comprehensive income (loss), and management needs to determine the fair value as at each period end. As there is no observable market data which can be used to determine this fair value, management uses property specific and market based information to determine whether a significant change in the fair value of these investments has occurred. Changes to the property specific and market based variables could result in the fair value being less than or greater than the amount recorded.
Accounting Standards Issued but Not Yet Applied	There are no IFRS or International Financial Reporting Interpretations Committee interpretations that are not yet effective that would be expected to have a material impact on the Company’s consolidated financial statements.

BASIS OF PRESENTATION (Tables)

BASIS OF PRESENTATION (Tables)	12 Months Ended
	Dec. 31, 2019
Basis Of Presentation
Subsidiaries	Name Place of Incorporation Ownership Percentage First Mining Gold Corp. Canada Parent Gold Canyon Resources Inc. (“Gold Canyon”) Canada 100% Goldlund Resources Inc. (“Goldlund”) Canada 100% Coastal Gold Corp. (“Coastal Gold”) Canada 100% Cameron Gold Operations Ltd. (“Cameron Gold”) Canada 100% PC Gold Inc. (“PC Gold”) Canada 100% Clifton Star Resources Inc. (“Clifton”) Canada 100%

ACCOUNTING POLICIES (Tables)

ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies
Property and equipment useful lives	Buildings 10 years Machinery and equipment 5 years Furniture and fixtures 5 years Vehicles 5 years Computer equipment 3 years Computer software 1 year

ACCOUNTS AND OTHER RECEIVABLES

ACCOUNTS AND OTHER RECEIVABLES (Tables)	12 Months Ended
	Dec. 31, 2019
Trade and other receivables [abstract]
Accounts and other receivables	Category December 31, 2019 December 31, 2018 Current GST and HST receivables $ 231 $ 71 Quebec mining tax receivables - 61 Other receivables 72 17 Total current accounts and other receivables $ 303 $ 149 Non-current Mexican VAT receivable 103 90 Total accounts and other receivables $ 406 $ 239

MARKETABLE SECURITIES (Tables)

MARKETABLE SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2019
Available-for-sale financial assets [abstract]
Change in marketable securities	Silver One Resources Inc. Gainey Capital Corp. Other Marketable Securities Total Balance as at December 31, 2018 $ 990 $ - $ 1,607 $ 2,597 Additions 60 171 - 231 Dispositions (1,758 ) - - (1,758 ) Gain (loss) recorded in other comprehensive loss 708 (97 ) 94 705 Balance as at December 31, 2019 $ - $ 74 $ 1,701 $ 1,775 Silver One Resources Inc. Gainey Capital Corp. Other Marketable Securities Total Balance as at December 31, 2017 $ 2,280 $ - $ 1,997 $ 4,277 Loss recorded in other comprehensive loss (1,290 ) - (390 ) (1,680 ) Balance as at December 31, 2018 $ 990 $ - $ 1,607 $ 2,597

MINERAL PROPERTIES (Tables)

MINERAL PROPERTIES (Tables)	12 Months Ended
	Dec. 31, 2019
Assets Arising From Exploration For And Evaluation Of Mineral Resources Abstract
Mineral properties	Balance December 31, 2018 Concessions, taxes, and royalties Salaries and share-based payments Drilling, exploration, and technical consulting Assaying, field supplies, and environmental Travel and other expenditures Option payments received and expenditures recovered Currency translation adjustments Disposal or write-down of mineral properties Balance December 31, 2019 Springpole $ 73,378 $ 347 $ 950 $ 1,058 $ 488 $ 554 $ - $ - $ - $ 76,775 Goldlund 96,604 3 726 1,085 240 236 - - - 98,894 Hope Brook 19,581 20 213 105 41 111 - - - 20,071 Cameron 27,032 56 87 126 16 57 - - - 27,374 Pickle Crow 16,754 31 88 46 2,376 18 (50 ) - - 19,263 Duquesne 5,091 2 3 35 1 1 - - - 5,133 Pitt 2,082 - - 2 - - - - - 2,084 Others(1) 2,559 3 17 27 8 1 - - - 2,615 Canada Total $ 243,081 $ 462 $ 2,084 $ 2,484 $ 3,170 $ 978 $ (50 ) $ - $ - $ 252,209 Miranda - - - - - - - - - - Socorro - - - - - - - - - - San Ricardo - - - - - - - - - - Las Margaritas 244 43 22 34 - - (179 ) (10 ) - 154 Others(2) - - - - - - - - - - Mexico Total $ 244 $ 43 $ 22 $ 34 $ - $ - $ (179 ) $ (10 ) $ - $ 154 USA 804 46 - - - - (25 ) (32 ) (341 ) 452 Total $ 244,129 $ 551 $ 2,106 $ 2,518 $ 3,170 $ 978 $ (254 ) $ (42 ) $ (341 ) $ 252,815 Balance December 31, 2017 Concessions, taxes, and royalties Salaries and share-based payments Drilling, exploration, and technical consulting Assaying, field supplies, and environmental Travel and other expenditures Option payments received and expenditures recovered Currency translation adjustments Disposal or write-down of mineral properties Balance December 31, 2018 Springpole $ 70,398 $ 237 $ 1,048 $ 657 $ 479 $ 559 $ - $ - $ - $ 73,378 Goldlund 93,807 2 928 1,045 596 226 - - - 96,604 Hope Brook 18,665 123 459 136 116 82 - - - 19,581 Cameron 26,676 39 193 57 39 28 - - - 27,032 Pickle Crow 16,496 50 92 58 36 22 - - - 16,754 Duquesne 5,053 6 4 27 - 1 - - - 5,091 Pitt 2,080 - - 1 - 1 - - - 2,082 Others(1) 2,515 2 10 21 9 2 - - - 2,559 Canada Total $ 235,690 $ 459 $ 2,734 $ 2,002 $ 1,275 $ 921 $ - $ - $ - $ 243,081 Miranda 810 48 18 9 1 - - 76 (962 ) - Socorro 782 107 3 4 - - - 77 (973 ) - San Ricardo 969 140 1 6 - 4 - 96 (1,216 ) - Las Margaritas 183 41 4 25 4 1 (33 ) 19 - 244 Others(2) 739 195 7 7 - 1 - 81 (1,030 ) - Mexico Total $ 3,483 $ 531 $ 33 $ 51 $ 5 $ 6 $ (33 ) $ 349 $ (4,181 ) $ 244 USA 698 43 - - - - - 63 - 804 Total $ 239,871 $ 1,033 $ 2,767 $ 2,053 $ 1,280 $ 927 $ (33 ) $ 412 $ (4,181 ) $ 244,129 (1) Other mineral properties in Canada as at December 31, 2019 and December 31, 2018 include the mining claims and concessions located in the Township of Duparquet, Quebéc, which are near the Company’s Duquesne gold project and the Duparquet gold project (in which the Company holds a 10% indirect interest). (2) Other mineral properties in Mexico as at December 31, 2019 and December 31, 2018 include Puertecitos, Los Tamales, Geranio, El Apache, El Roble, Batacosa and Lachatao. A write-down of these properties to $nil was recorded during the year ended December 31, 2018.

RIGHT-OF-USE-ASSET AND LEASE LI

RIGHT-OF-USE-ASSET AND LEASE LIABILITY (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [abstract]
Right-of-use asset and lease liability	Right-of-Use Asset Lease Liability Current portion Non-current portion Balance as at December 31, 2018 $ - $ - Present value of future lease payments 648 94 554 Balance as at December 31, 2019 $ 648 $ 94 $ 554
Maturity analysis	As at December 31, 2019 December 31, 2018 Less than one year $ 149 $ - One to five years 678 - More than five years - - Total undiscounted lease liability $ 827 $ -

ACCOUNTS PAYABLE AND ACCRUED _2

ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2019
Trade and other payables [abstract]
Accounts payable and accrued liabilities	Category December 31, 2019 December 31, 2018 Accounts payable $ 768 $ 341 Other accrued liabilities 630 241 Total $ 1,398 $ 582

ENVIRONMENTAL RECLAMATION PRO_2

ENVIRONMENTAL RECLAMATION PROVISION (Tables)	12 Months Ended
	Dec. 31, 2019
Environmental Reclamation Provision
Environmental reclamation provision balance	Current portion Non-current portion Total Balance as at December 31, 2018 $ - $ - $ - Present value of environmental reclamation provision 716 1,639 2,355 Balance as at December 31, 2019 $ 716 $ 1,639 $ 2,355

SHARE CAPITAL (Tables)

SHARE CAPITAL (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of classes of share capital [abstract]
Warrant activity	Number Weighted average exercise price Balance as at December 31, 2017 49,693,409 $ 0.81 Warrants exercised (5,131,300 ) 0.17 Warrants expired (24,445,254 ) 0.80 Balance as at December 31, 2018 20,116,855 $ 0.99 Warrants issued 12,845,383 0.40 Warrants exercised (214,200 ) 0.20 Warrants expired (16,875,040 ) 1.10 Balance as at December 31, 2019 15,872,998 $ 0.41
Warrants outstanding	Exercise price Number of warrants outstanding Weighted average exercise price ($ per share) Weighted average remaining life (years) $ 0.40 12,845,383 $ 0.40 2.38 $ 0.44 3,027,615 $ 0.44 1.46 15,872,998 $ 0.41 2.20
Warrant assumptions	Risk-free interest rate 1.55 % Expected life (years) 3.00 years Expected volatility(1) 67.22 % Expected dividend yield Nil
Stock option activity	Number Weighted average exercise price Balance as at December 31, 2017 30,608,000 $ 0.74 Granted – January 15, 2018 9,575,000 0.60 Granted – April 16, 2018 120,000 0.50 Granted – July 20, 2018 50,000 0.43 Granted – October 16, 2018 1,400,000 0.40 Granted – December 10, 2018 12,075,000 0.40 Options exercised (638,000 ) 0.17 Options expired (1,950,000 ) 1.27 Options forfeited (2,975,000 ) 0.68 Balance as at December 31, 2018 48,265,000 $ 0.61 Granted – January 7, 2019 5,000,000 0.40 Granted – April 1, 2019 750,000 0.40 Granted – April 29, 2019 2,000,000 0.40 Options expired (7,700,000 ) 0.68 Options forfeited (1,387,500 ) 0.50 Balance as at December 31, 2019 46,927,500 $ 0.57
Stock options outstanding	Options Exercisable Exerciseprice Number of options Weighted average exercise price ($ per share) Weighted average remaining life (years) Number of options Weighted average exercise price ($ per share) Weighted average remaining life (years) $ 0.01 – 0.50 24,442,500 $ 0.40 3.39 17,876,875 $ 0.39 3.15 $ 0.51 – 1.00 22,485,000 0.75 2.14 22,485,000 0.75 2.14 46,927,500 $ 0.57 2.79 40,361,875 $ 0.59 2.59
Share-based payments expenses	For the year ended December 31, Statements of Net Loss: 2019 2018 General and administration $ 824 $ 2,254 Exploration and evaluation 143 106 Investor relations and marketing communications 325 437 Corporate development and due diligence 304 235 Subtotal $ 1,596 $ 3,032 For the year ended December 31, Statements of Financial Position: 2019 2018 Mineral Properties $ 572 $ 1,169 Total $ 2,168 $ 4,201
Stock option weighted average assumptions	Year ended Year ended December 31, 2019 December 31, 2018 Risk-free interest rate 2.20 % 1.91 % Share price at grant date (in dollars) $ 0.36 $ 0.41 Exercise price (in dollars) $ 0.40 $ 0.48 Expected life (years) 5.00 years 5.00 years Expected volatility(1) 71.86 % 70.87 % Forfeiture rate 5.00 % 2.64 % Expected dividend yield Nil Nil (1) The computation of expected volatility prior to the December 10, 2018 option grant was based on the historical volatility of comparable companies from a representative peer group of publicly traded mineral exploration companies. Commencing December 10, 2018, the computation of expected volatility was based on the Company’s historical price volatility, over a period which approximates the expected life of the option.

FLOW-THROUGH SHARE PREMIUM LI_2

FLOW-THROUGH SHARE PREMIUM LIABILITY (Tables)	12 Months Ended
	Dec. 31, 2019
Flow-through Share Premium Liability
Continuity schedule	May 16, 2019 December 18, 2019 Total Balance, December 31, 2018 $ - $ - $ - Liability incurred on flow-through shares issued May 16, 2019 475 - 475 Settlement of flow-through share premium liability upon incurring eligible expenditures (430 ) - (430 ) Liability incurred on flow-through shares issued December 18, 2019 - 296 296 Balance, December 31, 2019 $ 45 $ 296 $ 341

OPERATING EXPENSES (Tables)

OPERATING EXPENSES (Tables)	12 Months Ended
	Dec. 31, 2019
Operating Expenses (Note 13)
Expenditures	Components by nature of the Company’s functional operating expense categories are as follows: For the year ended December 31, 2019 General and administration Exploration and evaluation Investor relations and marketing communications Corporate development and due diligence Total Administrative and office $ 424 $ 136 $ 21 $ 2 $ 583 Consultants 108 211 29 - 348 Depreciation 14 157 - - 171 Directors fees 277 - - - 277 Exploration and evaluation - 40 - - 40 Investor relations and marketing communications 1 8 592 - 601 Professional fees 614 5 - - 619 Salaries 899 329 175 179 1,582 Share-based payments (non-cash) (Note 11(d)) 824 143 325 304 1,596 Transfer agent and filing fees 193 - 1 - 194 Travel and accommodation 60 95 34 32 221 Operating expenses total $ 3,414 $ 1,124 $ 1,177 $ 517 $ 6,232 Write-down of mineral properties (non-cash) (Note 6) 341 Loss from operational activities $ 6,573 For the year ended December 31, 2018 General and administration Exploration and evaluation Investor relations and marketing communications Corporate development and due diligence Total Administrative and office $ 501 $ 139 $ 33 $ 5 $ 678 Consultants 62 72 17 - 151 Depreciation 11 193 - - 204 Directors fees 143 - - - 143 Exploration and evaluation - 1 - - 1 Investor relations and marketing communications 7 7 803 2 819 Professional fees 342 - - - 342 Salaries 1,110 145 228 238 1,721 Share-based payments (non-cash) (Note 11(d)) 2,254 106 437 235 3,032 Transfer agent and filing fees 162 - 8 - 170 Travel and accommodation 100 101 108 25 334 Operating expenses total $ 4,692 $ 764 $ 1,634 $ 505 $ 7,595 Write-down of mineral properties (non-cash) (Note 6) 4,181 Loss from operational activities $ 11,776

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of operating segments [abstract]
Segment information	Non-current assets December 31, 2019 December 31, 2018 Canada $ 253,587 $ 243,854 Mexico 252 334 USA 454 809 Total $ 254,293 $ 244,997

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2019
Income Taxes
Income tax expense (recovery)	Year ended December 31, 2019 Year ended December 31, 2018 Net loss before income tax $ 6,443 $ 11,645 Combined Canadian statutory income tax rate 27.00 % 27.00 % Income tax recovery computed at statutory income tax rate 1,740 3,144 Tax effect of: Permanent differences (678 ) (599 ) Difference in tax rates in foreign jurisdictions (17 ) 128 Changes in estimate and others 124 (539 ) Flow-through share premium liability 430 - Changes in unrecognized deferred tax assets (2,115 ) (2,134 ) Income tax expense $ (516 ) $ -
Deferred income tax assets	Recognized deferred income tax assets (liabilities) are comprised of: December 31, 2019 December 31, 2018 Non-capital loss carryforwards $ 1,162 $ 64 Property and equipment - 4 Mineral properties (1,978) (68) Mineral property investments (130) - Total $ (946) $ - Deferred tax assets have not been recognized in respect of the following items: December 31, 2019 December 31, 2018 Non-capital loss carryforwards $ 26,403 $ 24,172 Net capital loss carryforwards 763 1,580 Investment tax credits 3,857 3,857 Undeducted financing costs 41 77 Marketable securities 83 830 Property and equipment 304 261 Environmental reclamation provision 624 - Mineral properties 2,242 1,417 Total $ 34,317 $ 32,194

RELATED PARTY TRANSACTIONS (Tab

RELATED PARTY TRANSACTIONS (Tables)	12 Months Ended
	Dec. 31, 2019
Related party transactions [abstract]
Key management compensation	Service or Item Year ended December 31, 2019 2018 Directors’ fees $ 277 $ 143 Salaries and consultants’ fees 1,188 1,208 Severance payments - 410 Share-based payments (non-cash) 1,601 2,991 Total $ 3,066 $ 4,752

FAIR VALUE (Tables)

FAIR VALUE (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of fair value measurement of assets [abstract]
Financial assets measured at fair value	December 31, 2019 December 31, 2018 Fair value measurement Fair value measurement Carrying value Level 1 Level 3 Carrying value Level 1 Level 3 Financial assets: Marketable securities (Note 5) $ 1,775 $ 1,775 $ - $ 2,597 $ 2,597 $ - Mineral property investments (Note 7) 5,398 - 5,398 4,417 - 4,417 Total $ 7,173 $ 1,775 $ 5,398 $ 7,014 $ 2,597 $ 4,417
Financial instruments	At December 31, 2019 Amortized Cost (Financial assets) FVTOCI(1) Amortized Cost (Financial liabilities) Total Financial assets: Cash and cash equivalents $ 5,902 $ - $ - $ 5,902 Current accounts and other receivables 97 - - 97 Marketable securities - 1,775 - 1,775 Mineral property investments - 5,398 - 5,398 Reclamation deposit 119 - - 119 Total financial assets $ 6,118 $ 7,173 $ - $ 13,291 Financial liabilities: Accounts payable and accrued liabilities $ - $ - $ 1,398 $ 1,398 At December 31, 2018 Amortized Cost (Financial assets) FVTOCI(1) Amortized Cost (Financial liabilities) Total Financial assets: Cash and cash equivalents $ 5,115 $ - $ - $ 5,115 Current accounts and other receivables 17 - - 17 Marketable securities - 2,597 - 2,597 Mineral property investments - 4,417 - 4,417 Reclamation deposit 116 - - 116 Total financial assets $ 5,248 $ 7,014 $ - $ 12,262 Financial liabilities: Accounts payable and accrued liabilities $ - $ - $ 582 $ 582 (1) The Company made an irrevocable election to reclassify marketable securities and mineral property investments fair value remeasurements from FVTPL to FVTOCI.

FINANCIAL AND CAPITAL RISK MA_2

FINANCIAL AND CAPITAL RISK MANAGEMENT (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of credit risk exposure [abstract]
Liquidity risk	Carrying Amount Contractual Cash Flows Less than 1 year 1 – 3 years 4 – 5 years After 5 years Accounts payable and accrued liabilities $ 1,398 $ 1,398 $ 1,398 $ - $ - $ - Lease liability 648 827 149 496 182 -

BASIS OF PRESENTATION (Details)

BASIS OF PRESENTATION (Details)	12 Months Ended
	Dec. 31, 2019
Subsidiary 1
Disclosure of subsidiaries [line items]
Parent name	First Mining Gold Corp.
Parent place of incorporation	Canada
Subsidiary 2
Disclosure of subsidiaries [line items]
Subsidiary name	Gold Canyon Resources Inc. (“Gold Canyon”)
Subsidiary place of incorporation	Canada
Subsidiary ownership percentage	100.00%
Subsidiary 3
Disclosure of subsidiaries [line items]
Subsidiary name	Goldlund Resources Inc. (“Goldlund”)
Subsidiary place of incorporation	Canada
Subsidiary ownership percentage	100.00%
Subsidiary 4
Disclosure of subsidiaries [line items]
Subsidiary name	Coastal Gold Corp. (“Coastal Gold”)
Subsidiary place of incorporation	Canada
Subsidiary ownership percentage	100.00%
Subsidiary 5
Disclosure of subsidiaries [line items]
Subsidiary name	Cameron Gold Operations Ltd. (“Cameron Gold”)
Subsidiary place of incorporation	Canada
Subsidiary ownership percentage	100.00%
Subsidiary 6
Disclosure of subsidiaries [line items]
Subsidiary name	PC Gold Inc. (“PC Gold”)
Subsidiary place of incorporation	Canada
Subsidiary ownership percentage	100.00%
Subsidiary 7
Disclosure of subsidiaries [line items]
Subsidiary name	Clifton Star Resources Inc. (“Clifton”)
Subsidiary place of incorporation	Canada
Subsidiary ownership percentage	100.00%

ACCOUNTING POLICIES (Details)

ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2019
Buildings
Disclosure of detailed information about property, plant and equipment [line items]
Property and equipment useful lives	10 years
Machinery and equipment
Disclosure of detailed information about property, plant and equipment [line items]
Property and equipment useful lives	5 years
Furniture and fixtures
Disclosure of detailed information about property, plant and equipment [line items]
Property and equipment useful lives	5 years
Vehicles
Disclosure of detailed information about property, plant and equipment [line items]
Property and equipment useful lives	5 years
Computer equipment
Disclosure of detailed information about property, plant and equipment [line items]
Property and equipment useful lives	3 years
Computer software
Disclosure of detailed information about property, plant and equipment [line items]
Property and equipment useful lives	1 year

ACCOUNTS AND OTHER RECEIVABLE_2

ACCOUNTS AND OTHER RECEIVABLES (Details) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]
Current accounts and other receivables	$ 303	$ 149
Other non-current receivables	103	90
Accounts and other receivables	406	239
GST and HST receivables
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]
Current accounts and other receivables	231	71
Quebec mining tax receivables
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]
Current accounts and other receivables	0	61
Other receivables
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]
Current accounts and other receivables	72	17
Mexican VAT receivable
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]
Other non-current receivables	$ 103	$ 90

MARKETABLE SECURITIES (Details)

MARKETABLE SECURITIES (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
DisclosureOfAvailableforsaleFinancialAssetsLineItems [Line Items]
Marketable securities, beginning	$ 2,597	$ 4,277
Additions	231	0
Dispositions	(1,758)	0
Gain (loss) recorded in other comprehensive loss	705	(1,680)
Marketable securities, ending	1,775	2,597
Silver One Resources Inc.
DisclosureOfAvailableforsaleFinancialAssetsLineItems [Line Items]
Marketable securities, beginning	990	2,280
Additions	60	0
Dispositions	(1,758)	0
Gain (loss) recorded in other comprehensive loss	708	(1,290)
Marketable securities, ending	0	990
Gainey Capital Corp.
DisclosureOfAvailableforsaleFinancialAssetsLineItems [Line Items]
Marketable securities, beginning	0
Additions	171	0
Dispositions	0	0
Gain (loss) recorded in other comprehensive loss	(97)
Marketable securities, ending	74	0
Other Marketable Securities
DisclosureOfAvailableforsaleFinancialAssetsLineItems [Line Items]
Marketable securities, beginning	1,607	1,997
Additions	0	0
Dispositions	0	0
Gain (loss) recorded in other comprehensive loss	94	(390)
Marketable securities, ending	$ 1,701	$ 1,607

MINERAL PROPERTIES (Details)

MINERAL PROPERTIES (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	$ 244,129	$ 239,871
Concessions, taxes and royalties	551	1,033
Salaries and share-based payments	2,106	2,767
Drilling, exploration, and technical consulting	2,518	2,053
Assaying, field supplies and environment	3,170	1,280
Travel and other expenditures	978	927
Option payments received and expenditures recovered	(254)	(33)
Currency translation adjustments	(42)	412
Disposal or write-downs of mineral properties	(341)	(4,181)
Mineral properties, ending	252,815	244,129
Canada
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	243,081	235,690
Concessions, taxes and royalties	462	459
Salaries and share-based payments	2,084	2,734
Drilling, exploration, and technical consulting	2,484	2,002
Assaying, field supplies and environment	3,170	1,275
Travel and other expenditures	978	921
Option payments received and expenditures recovered	(50)	0
Currency translation adjustments	0	0
Disposal or write-downs of mineral properties	0	0
Mineral properties, ending	252,209	243,081
Canada | Springpole
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	73,378	70,398
Concessions, taxes and royalties	347	237
Salaries and share-based payments	950	1,048
Drilling, exploration, and technical consulting	1,058	657
Assaying, field supplies and environment	488	479
Travel and other expenditures	554	559
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	0
Disposal or write-downs of mineral properties	0	0
Mineral properties, ending	76,775	73,378
Canada | Goldlund Gold
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	96,604	93,807
Concessions, taxes and royalties	3	2
Salaries and share-based payments	726	928
Drilling, exploration, and technical consulting	1,085	1,045
Assaying, field supplies and environment	240	596
Travel and other expenditures	236	226
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	0
Disposal or write-downs of mineral properties	0	0
Mineral properties, ending	98,894	96,604
Canada | Hope Brook
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	19,581	18,665
Concessions, taxes and royalties	20	123
Salaries and share-based payments	213	459
Drilling, exploration, and technical consulting	105	136
Assaying, field supplies and environment	41	116
Travel and other expenditures	111	82
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	0
Disposal or write-downs of mineral properties	0	0
Mineral properties, ending	20,071	19,581
Canada | Cameron Gold
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	27,032	26,676
Concessions, taxes and royalties	56	39
Salaries and share-based payments	87	193
Drilling, exploration, and technical consulting	126	57
Assaying, field supplies and environment	16	39
Travel and other expenditures	57	28
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	0
Disposal or write-downs of mineral properties	0	0
Mineral properties, ending	27,374	27,032
Canada | Pickle Crow
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	16,754	16,496
Concessions, taxes and royalties	31	50
Salaries and share-based payments	88	92
Drilling, exploration, and technical consulting	46	58
Assaying, field supplies and environment	2,376	36
Travel and other expenditures	18	22
Option payments received and expenditures recovered	(50)	0
Currency translation adjustments	0	0
Disposal or write-downs of mineral properties	0	0
Mineral properties, ending	19,263	16,754
Canada | Duquesne
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	5,091	5,053
Concessions, taxes and royalties	2	6
Salaries and share-based payments	3	4
Drilling, exploration, and technical consulting	35	27
Assaying, field supplies and environment	1	0
Travel and other expenditures	1	1
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	0
Disposal or write-downs of mineral properties	0	0
Mineral properties, ending	5,133	5,091
Canada | Pitt Gold
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	2,082	2,080
Concessions, taxes and royalties	0	0
Salaries and share-based payments	0	0
Drilling, exploration, and technical consulting	2	1
Assaying, field supplies and environment	0	0
Travel and other expenditures	0	1
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	0
Disposal or write-downs of mineral properties	0	0
Mineral properties, ending	2,084	2,082
Canada | Others
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	2,559	2,515
Concessions, taxes and royalties	3	2
Salaries and share-based payments	17	10
Drilling, exploration, and technical consulting	27	21
Assaying, field supplies and environment	8	9
Travel and other expenditures	1	2
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	0
Disposal or write-downs of mineral properties	0	0
Mineral properties, ending	2,615	2,559
Mexico
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	244	3,483
Concessions, taxes and royalties	43	531
Salaries and share-based payments	22	33
Drilling, exploration, and technical consulting	34	51
Assaying, field supplies and environment	0	5
Travel and other expenditures	0	6
Option payments received and expenditures recovered	(179)	(33)
Currency translation adjustments	(10)	349
Disposal or write-downs of mineral properties	0	(4,181)
Mineral properties, ending	154	244
Mexico | Others
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	0	739
Concessions, taxes and royalties	0	195
Salaries and share-based payments	0	7
Drilling, exploration, and technical consulting	0	7
Assaying, field supplies and environment	0	0
Travel and other expenditures	0	2
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	81
Disposal or write-downs of mineral properties	0	(1,030)
Mineral properties, ending	0	0
Mexico | Miranda
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	0	810
Concessions, taxes and royalties	0	48
Salaries and share-based payments	0	18
Drilling, exploration, and technical consulting	0	9
Assaying, field supplies and environment	0	1
Travel and other expenditures	0	0
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	76
Disposal or write-downs of mineral properties	0	(962)
Mineral properties, ending	0	0
Mexico | Socorro
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	0	782
Concessions, taxes and royalties	0	107
Salaries and share-based payments	0	3
Drilling, exploration, and technical consulting	0	4
Assaying, field supplies and environment	0	0
Travel and other expenditures	0	0
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	77
Disposal or write-downs of mineral properties	0	(973)
Mineral properties, ending	0	0
Mexico | San Ricardo
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	0	969
Concessions, taxes and royalties	0	140
Salaries and share-based payments	0	1
Drilling, exploration, and technical consulting	0	6
Assaying, field supplies and environment	0	0
Travel and other expenditures	0	4
Option payments received and expenditures recovered	0	0
Currency translation adjustments	0	96
Disposal or write-downs of mineral properties	0	(1,216)
Mineral properties, ending	0	0
Mexico | LasMargaritas
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	244	183
Concessions, taxes and royalties	43	41
Salaries and share-based payments	22	4
Drilling, exploration, and technical consulting	34	25
Assaying, field supplies and environment	0	4
Travel and other expenditures	0
Option payments received and expenditures recovered	(179)	(33)
Currency translation adjustments	(10)	19
Disposal or write-downs of mineral properties	0	0
Mineral properties, ending	154	244
USA
DisclosureOfMineralPropertiesLineItems [Line Items]
Mineral properties, beginning	804	698
Concessions, taxes and royalties	46	43
Salaries and share-based payments	0	0
Drilling, exploration, and technical consulting	0	0
Assaying, field supplies and environment	0	0
Travel and other expenditures	0	0
Option payments received and expenditures recovered	(25)	0
Currency translation adjustments	(32)	63
Disposal or write-downs of mineral properties	(341)	0
Mineral properties, ending	$ 452	$ 804

MINERAL PROPERTY INVESTMENTS (D

MINERAL PROPERTY INVESTMENTS (Details Narrative) - CAD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Mineral Property Investments
Mineral property investments, beginning	$ 4,417	$ 4,417
Fair value gain	981
Mineral property investments, ending	$ 5,398	$ 4,417

RIGHT-OF-USE ASSET AND LEASE _2

RIGHT-OF-USE ASSET AND LEASE LIABILITY (Details)	12 Months Ended
	Dec. 31, 2019CAD ($)
Right of Use Assets
Beginning balance	$ 0
Present value of future lease payments	648
Ending balance	648
Lease Liability | Current Portion
Lease Liability
Beginning balance	0
Present value of future lease payments	94
Ending balance	94
Lease Liability | Non-current portion
Lease Liability
Beginning balance	0
Present value of future lease payments	554
Ending balance	$ 554

RIGHT-OF-USE ASSET AND LEASE _3

RIGHT-OF-USE ASSET AND LEASE LIABILITY (Details 1) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
Disclosure of maturity analysis of operating lease payments [abstract]
Less than one year	$ 149	$ 0
One to five years	678	0
More than five years	0	0
Total undiscounted lease liability	$ 827	$ 0

ACCOUNTS PAYABLE AND ACCRUED _3

ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
Trade and other payables [abstract]
Accounts payable	$ 768	$ 341
Other accrued liabilities	630	241
Accounts payable and other accrued liabilities	$ 1,398	$ 582

ENVIRONMENTAL RECLAMATION PRO_3

ENVIRONMENTAL RECLAMATION PROVISION (Details)	Dec. 31, 2019CAD ($)
Statement Line Items [Line Items]
Beginning Balance	$ 0
Present value of environmental reclamation provision	2,355
Ending Balance	2,355
Current portion
Statement Line Items [Line Items]
Beginning Balance	0
Present value of environmental reclamation provision	716
Ending Balance	716
Non-current portion
Statement Line Items [Line Items]
Beginning Balance	0
Present value of environmental reclamation provision	1,639
Ending Balance	$ 1,639

SHARE CAPITAL (Details)

SHARE CAPITAL (Details)	12 Months Ended
	Dec. 31, 2019shares$ / shares	Dec. 31, 2018shares$ / shares
Disclosure Of Detailed Information About Warrants Activity Abstract
Warrants, outstanding, beginning | shares	20,116,855	49,693,409
Warrants Issued | shares	12,845,383	0
Warrants, exercised | shares	(214,200)	(5,131,300)
Warrants expired | shares	(16,875,040)	(24,445,254)
Warrants, outstanding, ending | shares	15,872,998	20,116,855
Weighted average exercise price, outstanding, beginning | $ / shares	$ .99	$ 0.81
Weighted average exercise price, issued | $ / shares	.40	.00
Weighted average exercise price, exercised | $ / shares	.20	0.17
Weighted average exercise price, expired | $ / shares	1.10	0.80
Weighted average exercise price, outstanding, ending | $ / shares	$ .41	$ 0.99

SHARE CAPITAL (Details 1)

SHARE CAPITAL (Details 1)	12 Months Ended
	Dec. 31, 2019CAD ($)sharesyr	Dec. 31, 2018shares	Dec. 31, 2017shares
DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsLineItems [Line Items]
Warrants, outstanding | shares	15,872,998	20,116,855	49,693,409
Weighted average exercise price, outstanding | $	$ 0.41
Weighted average remaining life, outstanding | yr	2.20
Warrant 1
DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsLineItems [Line Items]
Exercise price	.40
Warrants, outstanding | shares	12,845,383
Weighted average exercise price, outstanding | $	$ 0.4
Weighted average remaining life, outstanding | yr	2.38
Warrant 2
DisclosureOfRangeOfExercisePricesOfOutstandingWarrantsLineItems [Line Items]
Exercise price	.44
Warrants, outstanding | shares	3,027,615
Weighted average exercise price, outstanding | $	$ 0.44
Weighted average remaining life, outstanding | yr	1.46

SHARE CAPITAL (Details 2)

SHARE CAPITAL (Details 2)	12 Months Ended
	Dec. 31, 2019
Disclosure Of Assumptions For Warrants Abstract
Risk-free interest rate	1.55%
Expected life (years)	3 years
Expected volatility	67.22%
Expected dividend yield	0.00%

SHARE CAPITAL (Details 3)

SHARE CAPITAL (Details 3)	12 Months Ended
	Dec. 31, 2019CAD ($)shares$ / shares	Dec. 31, 2018CAD ($)shares$ / shares
Disclosure of classes of share capital [abstract]
Options, outstanding, beginning	48,265,000	30,608,000
Options, issued	5,000,000	9,575,000
Options, issued	750,000	120,000
Options, issued	2,000,000	50,000
Options, issued		1,400,000
Options, issued		12,075,000
Options, exercised	0	(638,000)
Options, expired	(7,700,000)	(1,950,000)
Options, forfeited	(1,287,500)	(2,975,000)
Options, outstanding, ending	46,927,500	48,265,000
Weighted average exercise price, outstanding, beginning | $ / shares	$ 0.01	$ 0.01
Weighted average exercise price, issued | $ / shares	$ 0.40	$ 0.60
Weighted average exercise price, issued | $	$ 0.4	$ 0.5
Weighted average exercise price, issued | $	$ 0.4	0.43
Weighted average exercise price, issued | $		0.4
Weighted average exercise price, issued | $		$ 0.4
Weighted average exercise price, exercised | $ / shares	$ 0	$ 0.17
Weighted average exercise price, expired | $	$ 0.68	$ 1.27
Weighted average exercise price, forfeited | $	$ 0.5	$ 0.68
Weighted average exercise price, outstanding, ending | $ / shares	$ 0.01	$ 0.01

SHARE CAPITAL (Details 4)

SHARE CAPITAL (Details 4)	12 Months Ended
	Dec. 31, 2019CAD ($)sharesyr$ / shares	Dec. 31, 2018shares	Dec. 31, 2017shares
Disclosure of range of exercise prices of outstanding share options [line items]
Number of options, outstanding	46,927,500	48,265,000	30,608,000
Weighted average exercise price, outstanding | $	$ 0.57
Weighted average remaining life, outstanding	2.79
Number of options, exercisable	40,361,875
Weighted average exercise price, exercisable | $ / shares	$ 0.59
Weighted average remaining life, exercisable | yr	2.59
Warrant 1
Disclosure of range of exercise prices of outstanding share options [line items]
Exercise price	$0.01-0.50
Number of options, outstanding	24,442,500
Weighted average exercise price, outstanding | $	$ 0.4
Weighted average remaining life, outstanding	3.39
Number of options, exercisable	17,876,875
Weighted average exercise price, exercisable | $ / shares	$ 0.39
Weighted average remaining life, exercisable | yr	3.15
Warrant 2
Disclosure of range of exercise prices of outstanding share options [line items]
Exercise price	$0.51-1.00
Number of options, outstanding	22,485,000
Weighted average exercise price, outstanding | $	$ 0.75
Weighted average remaining life, outstanding	2.14
Number of options, exercisable	224,855,000
Weighted average exercise price, exercisable | $ / shares	$ 0.75
Weighted average remaining life, exercisable | yr	2.14

SHARE CAPITAL (Details 5)

SHARE CAPITAL (Details 5) - CAD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
DisclosureOfSharebasedPaymentsLineItems [Line Items]
Statements of Net Loss: share-based payments	$ 1,596	$ 3,032
Share-based payments	2,168	4,201
General and administration
DisclosureOfSharebasedPaymentsLineItems [Line Items]
Statements of Net Loss: share-based payments	824	2,254
Exploration and evaluation
DisclosureOfSharebasedPaymentsLineItems [Line Items]
Statements of Net Loss: share-based payments	143	106
Investor relations and marketing
DisclosureOfSharebasedPaymentsLineItems [Line Items]
Statements of Net Loss: share-based payments	325	437
Corporate development and due diligence
DisclosureOfSharebasedPaymentsLineItems [Line Items]
Statements of Net Loss: share-based payments	304	235
Mineral properties
DisclosureOfSharebasedPaymentsLineItems [Line Items]
Statements of Financial Position: share-based payments	$ 572	$ 1,169

SHARE CAPITAL (Details 6)

SHARE CAPITAL (Details 6)	12 Months Ended
	Dec. 31, 2019CAD ($)yr$ / shares	Dec. 31, 2018CAD ($)yr$ / shares
Disclosure of classes of share capital [abstract]
Risk-free interest rate	2.20%	1.91%
Share price at grant date	$ 0.36	$ 0.41
Exercise price	$ 0	$ 0
Expected life | yr	5	5
Expected volatility	71.86%	70.87%
Forfeiture rate	5.00%	2.64%
Expected dividend yield | $	$ 0	$ 0

SHARE CAPITAL (Details Narrativ

SHARE CAPITAL (Details Narrative) - shares	Dec. 31, 2019	Dec. 31, 2018
Disclosure of classes of share capital [abstract]
Common shares issued and fully paid	591,997,138	558,316,916

FLOW-THROUGH SHARE PREMIUM LI_3

FLOW-THROUGH SHARE PREMIUM LIABILITY (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement Line Items [Line Items]
Beginning Balance	$ 0
Liability incurred on flow-through shares issued May 16,2019	475
Settlement of flow-through share premium liability upon incurring incurring elegible expenditures	(430)	$ 0
Liability incurred on flow-through shares issued December 18, 2019	296
Ending Balance	341
May 16, 2019
Statement Line Items [Line Items]
Beginning Balance	0
Liability incurred on flow-through shares issued May 16,2019	475
Settlement of flow-through share premium liability upon incurring incurring elegible expenditures	(430)
Liability incurred on flow-through shares issued December 18, 2019	0
Ending Balance	45
December 18, 2019
Statement Line Items [Line Items]
Beginning Balance	0
Liability incurred on flow-through shares issued May 16,2019	0
Settlement of flow-through share premium liability upon incurring incurring elegible expenditures	0
Liability incurred on flow-through shares issued December 18, 2019	296
Ending Balance	$ 296

OPERATING EXPENSES (Details)

OPERATING EXPENSES (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	$ 3,414	$ 4,692
Exploration and evaluation	1,124	764
Investor relations and marketing communications	1,177	1,634
Corporate development and due diligence	517	505
Write-down of mineral properties (non-cash)	341	4,181
Total	6,232	11,776
Loss from operational activities	6,573	11,776
Administrative and office
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	424	501
Exploration and evaluation	136	139
Investor relations and marketing communications	21	33
Corporate development and due diligence	2	5
Total	583	678
Consultants
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	108	62
Exploration and evaluation	211	72
Investor relations and marketing communications	29	17
Corporate development and due diligence	0	0
Total	348	151
Depreciation (non-cash)
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	14	11
Exploration and evaluation	157	193
Investor relations and marketing communications	0	0
Corporate development and due diligence	0	0
Total	171	204
Directors fees
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	277	143
Exploration and evaluation	0	0
Investor relations and marketing communications	0	0
Corporate development and due diligence	0	0
Total	277	143
Exploration and evaluation
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	0	0
Exploration and evaluation	40	1
Investor relations and marketing communications	0	0
Corporate development and due diligence	0	0
Total	40	1
Investor relations and marketing communications
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	1	7
Exploration and evaluation	8	7
Investor relations and marketing communications	592	803
Corporate development and due diligence	0	2
Total	601	819
Professional fees
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	614	342
Exploration and evaluation	5	0
Investor relations and marketing communications	0	0
Corporate development and due diligence	0	0
Total	619	342
Salaries
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	899	1,110
Exploration and evaluation	329	145
Investor relations and marketing communications	175	228
Corporate development and due diligence	179	238
Total	1,582	1,721
Share-based payments (non-cash)
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	824	2,254
Exploration and evaluation	143	106
Investor relations and marketing communications	325	437
Corporate development and due diligence	304	235
Total	1,596	3,032
Transfer agent and filing fees
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	193	162
Exploration and evaluation	0	0
Investor relations and marketing communications	1	8
Corporate development and due diligence	0	0
Total	194	170
Travel and accommodation
DisclosureOfExpenseByNatureLineItems [Line Items]
General and administration	60	100
Exploration and evaluation	95	101
Investor relations and marketing communications	34	108
Corporate development and due diligence	32	25
Total	$ 221	$ 334

SEGMENT INFORMATION (Details)

SEGMENT INFORMATION (Details) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
Disclosure of operating segments [line items]
Total non-current assets	$ 254,293	$ 244,997
Canada
Disclosure of operating segments [line items]
Total non-current assets	253,587	243,854
Mexico
Disclosure of operating segments [line items]
Total non-current assets	252	334
USA
Disclosure of operating segments [line items]
Total non-current assets	$ 454	$ 809

INCOME TAXES (Details)

INCOME TAXES (Details) - CAD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Net loss before income tax	$ 6,443	$ 11,645
Combined Canadian statutory income tax rate	27.00%	27.00%
Income tax recovery computed at statutory income tax	$ 1,740	$ 3,144
Tax effect of:
Permanent differences	(678)	(599)
Difference in tax rates in foreign jurisdictions	(17)	128
Changes in estimate and others	124	(539)
Flow-through share premium liability	(430)	0
Changes in unrecognized deferred tax assets	(2,115)	(2,134)
Income tax expense	$ (516)	$ 0

INCOME TAXES (Details 1)

INCOME TAXES (Details 1) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Non-capital loss carry forwards	$ 1,162	$ 64
Property and equipment	0	4
Mineral properties	(1,978)	(68)
Mineral property investments	(130)	0
Total	$ (946)	$ 0

INCOME TAXES (Details 2)

INCOME TAXES (Details 2) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
DisclosureOfDeferredTaxAssetsAndLiabilitiesLineItems [Line Items]
Deferred income tax assets, net	$ 34,317	$ 32,194
Marketable securities
DisclosureOfDeferredTaxAssetsAndLiabilitiesLineItems [Line Items]
Deferred income tax assets, net	83	830
Property and equipment
DisclosureOfDeferredTaxAssetsAndLiabilitiesLineItems [Line Items]
Deferred income tax assets, net	304	261
Environmental reclamation provision
DisclosureOfDeferredTaxAssetsAndLiabilitiesLineItems [Line Items]
Deferred income tax assets, net	624	0
Mineral properties
DisclosureOfDeferredTaxAssetsAndLiabilitiesLineItems [Line Items]
Deferred income tax assets, net	2,242	1,417
Non-capital loss carryforwards
DisclosureOfDeferredTaxAssetsAndLiabilitiesLineItems [Line Items]
Deferred income tax assets, net	26,403	24,172
Net capital loss carryforwards
DisclosureOfDeferredTaxAssetsAndLiabilitiesLineItems [Line Items]
Deferred income tax assets, net	763	1,580
Investment tax credits
DisclosureOfDeferredTaxAssetsAndLiabilitiesLineItems [Line Items]
Deferred income tax assets, net	3,857	3,857
Undeducted financing costs and others
DisclosureOfDeferredTaxAssetsAndLiabilitiesLineItems [Line Items]
Deferred income tax assets, net	$ 41	$ 77

INCOME TAXES (Details Narrative

INCOME TAXES (Details Narrative) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
DisclosureOfIncomeTaxesLineItems [Line Items]
Non-capital loss carryforwards	$ 1,162	$ 64
Canada
DisclosureOfIncomeTaxesLineItems [Line Items]
Non-capital loss carryforwards	99,214	87,300
Investment Tax Credits	5,282	5,282
Capital loss carryforwards	2,827	5,900
Mexico
DisclosureOfIncomeTaxesLineItems [Line Items]
Non-capital loss carryforwards	$ 1,900	$ 1,603

RELATED PARTY TRANSACTIONS (Det

RELATED PARTY TRANSACTIONS (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Related party transactions [abstract]
Directors' fees	$ 277	$ 143
Salaries and consultants' fees	1,188	1,208
Severance payments	0	410
Share-based payments (non-cash)	1,601	2,991
Total	$ 3,066	$ 4,752

FAIR VALUE (Details)

FAIR VALUE (Details) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets [line items]
Marketable securities	$ 1,775	$ 2,597
Mineral property investments	5,398	4,417	$ 4,417
Total	7,173	7,014
Level 1
Disclosure of financial assets [line items]
Marketable securities	1,775	2,597
Mineral property investments	0	0
Total	1,775	2,597
Level 3
Disclosure of financial assets [line items]
Marketable securities	0	0
Mineral property investments	5,398	4,417
Total	$ 5,398	$ 4,417

FAIR VALUE (Details 1)

FAIR VALUE (Details 1) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]
Financial assets at amortized cost	$ 6,118	$ 5,248
Financial assets at fair value through other comprehensive income	7,173	7,014
Total financial assets	13,291	12,262
Financial liabilities at amortized cost	1,398	582
Accounts payable and accrued liabilities
Disclosure of fair value measurement of assets [line items]
Financial assets at amortized cost		0
Financial assets at fair value through other comprehensive income		0
Financial liabilities at amortized cost	1,398	582
Cash and cash equivalents
Disclosure of fair value measurement of assets [line items]
Financial assets at amortized cost	5,902	5,115
Financial assets at fair value through other comprehensive income	0	0
Total financial assets	5,902	5,115
Financial liabilities at amortized cost	0	0
Current accounts and other receivables
Disclosure of fair value measurement of assets [line items]
Financial assets at amortized cost	97	17
Financial assets at fair value through other comprehensive income	0	0
Total financial assets	97	17
Financial liabilities at amortized cost	0	0
Marketable securities
Disclosure of fair value measurement of assets [line items]
Financial assets at amortized cost	0	0
Financial assets at fair value through other comprehensive income	1,775	2,597
Total financial assets	1,775	2,597
Financial liabilities at amortized cost	0	0
Mineral property investments
Disclosure of fair value measurement of assets [line items]
Financial assets at amortized cost	0	0
Financial assets at fair value through other comprehensive income	5,398	4,417
Total financial assets	5,398	4,417
Financial liabilities at amortized cost	0	0
Reclamation deposit
Disclosure of fair value measurement of assets [line items]
Financial assets at amortized cost	119	116
Financial assets at fair value through other comprehensive income	0	0
Total financial assets	119	116
Financial liabilities at amortized cost	$ 0	$ 0

FINANCIAL AND CAPITAL RISK MA_3

FINANCIAL AND CAPITAL RISK MANAGEMENT (Details) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018
DisclosureOfLiquidityRiskExposureLineItems [Line Items]
Accounts payable and accrued liabilities	$ 1,398	$ 582
Lease liability	648
Contractual Cash Flows
DisclosureOfLiquidityRiskExposureLineItems [Line Items]
Accounts payable and accrued liabilities	1,398
Lease liability	827
Less than 1 year
DisclosureOfLiquidityRiskExposureLineItems [Line Items]
Accounts payable and accrued liabilities	1,398
Lease liability	149
1 - 3 years
DisclosureOfLiquidityRiskExposureLineItems [Line Items]
Accounts payable and accrued liabilities	0
Lease liability	496
4 - 5 years
DisclosureOfLiquidityRiskExposureLineItems [Line Items]
Accounts payable and accrued liabilities	0
Lease liability	182
After 5 years
DisclosureOfLiquidityRiskExposureLineItems [Line Items]
Accounts payable and accrued liabilities	0
Lease liability	$ 0

FINANCIAL AND CAPITAL RISK MA_4

FINANCIAL AND CAPITAL RISK MANAGEMENT (Details Narrative) - CAD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of credit risk exposure [abstract]
Cash and cash equivalents	$ 5,902	$ 5,115	$ 15,400

Uncategorized Items - ffmgf-201

Label	Element	Value
Cash	ifrs-full_Cash	$ 5,858
Cash	ifrs-full_Cash	867
Term deposits	ifrs-full_ShorttermDepositsClassifiedAsCashEquivalents	44
Term deposits	ifrs-full_ShorttermDepositsClassifiedAsCashEquivalents	$ 4,248