Polymet Mining (PLM) 40-F 18 Mar 21 2020 FY Annual report (Canada) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2020shares
Cover [Abstract]
Entity Registrant Name	POLYMET MINING CORP
Entity Central Index Key	0000866028
Document Type	40-F
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding	100,733,778
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Entity Emerging Growth Company	false
Entity Interactive Data Current	Yes

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current
Cash	$ 3,554	$ 7,401
Amounts receivable	385	472
Prepaid expenses	1,203	1,039
Total current assets	5,142	8,912
Non-Current
Restricted deposits	12,976	11,449
Amounts receivable and other assets	2,647	2,442
Mineral property, plant and equipment	415,559	410,132
Intangibles	24,390	24,380
Total assets	460,714	457,315
Current
Accounts payable and accruals	2,755	4,533
Lease liabilities	106	60
Promissory note	16,629
Environmental rehabilitation provision	893	1,276
Total Current Liabilities	20,383	5,869
Non-Current
Accruals	637
Lease liabilities	451	556
Promissory note		15,501
Convertible Debt	18,747	0
Environmental rehabilitation provision	50,857	51,249
Total Liabilities	91,075	73,175
SHAREHOLDERS' EQUITY
Share Capital	527,908	526,884
Equity reserves	69,953	64,648
Deficit	(228,222)	(207,392)
Total Shareholders' Equity	369,639	384,140
Total Liabilities and Shareholders' Equity	$ 460,714	$ 457,315

Consolidated Statements of Loss

Consolidated Statements of Loss and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operations Expense
Resource evaluation	$ 10,811
Salaries, directors' fees and related benefits	4,129	$ 2,933
Share-based compensation	1,842	1,558
Public company and public relations	1,381	1,233
Professional fees	892	1,444
Office and administration	798	580
Depreciation	224	122
Loss from Operations	20,077	7,870
Other Expenses (Income)
Finance costs - net	1,044	1,532
Loss (gain) on foreign exchange	(1)	12
Loss on debenture modification		2,004
Loss (gain) on disposal of assets	142	(383)
Gain on financial asset fair value	(408)	(264)
Asset impairment		47,168
Other income	(24)	(36)
Total Other Expenses	753	50,033
Total Loss and Comprehensive Loss for the Period	$ 20,830	$ 57,903
Basic and Diluted Loss per Share (in dollars per share)	$ 0.21	$ 0.86
Weighted Average Number of Shares - basic and diluted (in shares)	100,663,439	67,209,105

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Shares Capital [Member]	Equity Reserves [Member]	Deficit [Member]	Total
Balance at Dec. 31, 2018	$ 272,420	$ 62,111	$ (149,489)	$ 185,042
Balance (shares) at Dec. 31, 2018	32,119,007
Statement [Line Items]
Total comprehensive loss for the period			(57,903)	(57,903)
Rights offering & issuance costs	$ 253,047			253,047
Rights offering & issuance costs (shares)	68,281,384
Debenture refinancing warrants		1,564		1,564
Payment of land purchase options	$ 46			46
Payment of land purchase options (shares)	7,875
Exercise of share options	$ 572	(298)		274
Exercise of share options (shares)	40,017
Vesting of restricted shares and RSU's	$ 715	(715)
Vesting of restricted shares and RSU's (shares)	64,451
Share-based compensation and rounding	$ 84	1,986		2,070
Share-based compensation and rounding (shares)	10,292
Balance at Dec. 31, 2019	$ 526,884	64,648	(207,392)	384,140
Balance (shares) at Dec. 31, 2019	100,523,026
Statement [Line Items]
Total comprehensive loss for the period			(20,830)	(20,830)
Debenture exchange warrants		4,976		4,976
Vesting of restricted shares and RSU's	$ 874	(874)
Vesting of restricted shares and RSU's (shares)	153,304
Share-based compensation and rounding	$ 150	1,203		1,353
Share-based compensation and rounding (shares)	57,448
Balance at Dec. 31, 2020	$ 527,908	$ 69,953	$ (228,222)	$ 369,639
Balance (shares) at Dec. 31, 2020	100,733,778

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Loss for the period	$ (20,830)	$ (57,903)
Items not involving cash:
Depreciation	224	122
Interest expense	1,963	160
Environmental rehabilitation provision accretion	2,083	2,072
Share-based compensation	1,842	1,558
Unrealized (gain) loss on foreign exchange	(1)	16
Loss on debenture modification		2,004
Loss (gain) on disposal of assets	142	(383)
Gain on financial asset fair value	(408)	(264)
Asset impairment		47,168
Changes in non-cash working capital
Restricted deposits	(1,527)	(1,163)
Amounts receivable and other assets	290	442
Prepaid expenses	(164)	122
Accounts payable and accruals	(1,554)	1,577
Net cash used in operating activities	(17,940)	(4,472)
Financing Activities
Share issuance proceeds		21,839
Share issuance costs		(11,953)
Debenture funding, net of costs	22,888	15,000
Debenture repayment		(6,882)
Cash settled RSU's	(204)	(232)
Net cash provided by financing activities	22,684	17,772
Investing Activities
Property, plant and equipment purchases	(8,530)	(20,795)
Property, plant and equipment disposal proceeds		1,250
Intangible purchases	(62)	(195)
Net cash used in investing activities	(8,592)	(19,740)
Net Decrease in Cash	(3,848)	(6,440)
Effect of foreign exchange on Cash	1	(16)
Cash - Beginning of period	7,401	13,857
Cash - End of period	3,554	7,401
Supplemental information: non-cash investing and financing
Capitalization of accounts payable and accruals to mineral property	(223)	(712)
Capitalization of borrowing costs to mineral property		14,751
Capitalization of share-based compensation to mineral property	$ 351	497
Capitalization of shares for land options to mineral property		46
Share issuance proceeds		243,435
Debenture repayment		$ (243,435)

Nature of Business and Liquidit

Nature of Business and Liquidity	12 Months Ended
	Dec. 31, 2020
Disclosure Of Nature Of Business And Going Concern [Abstract]
Nature of Business and Liquidity [Text Block]	1. Nature of Business and Liquidity PolyMet Mining Corp. was incorporated in British Columbia, Canada on March 4, 1981 under the name Fleck Resources Ltd. and changed its name to PolyMet Mining Corp. on June 10, 1998. Through its 100%-owned subsidiary, Poly Met Mining, Inc. (“PolyMet US” and, together with PolyMet Mining Corp., “PolyMet” or the “Company”), the Company is engaged in the exploration and development of natural resource properties. The Company's shares are listed on the TSX and NYSE American. Glencore AG, a wholly owned subsidiary of Glencore plc (together "Glencore"), has a majority shareholder relationship with the Company as a result of Glencore's ownership of 71.5% of the Company's issued shares. The Company’s primary mineral property is the NorthMet Project (“NorthMet” or “Project”), a polymetallic project in northeastern Minnesota, United States of America, which comprises the NorthMet copper-nickel-precious metals ore body and the Erie Plant, a processing facility located approximately six miles from the ore body. PolyMet received its Permit to Mine from the State of Minnesota on November 1, 2018, a crucial permit for construction and operation of the Project. The Minnesota Department of Natural Resources ("MDNR") also issued all other permits for which the Company had applied including dam safety, water appropriations, endangered and threatened species takings, and public waters work permits, along with Wetlands Conservation Act approval. In addition, PolyMet received air and water permits from the Minnesota Pollution Control Agency ("MPCA") on December 18, 2018. Further, PolyMet received the federal Record of Decision and Section 404 Wetlands Permit from the U.S. Army Corps of Engineers on March 21, 2019, which was the last key permit or approval needed to construct and operate the Project. Legal challenges were filed in the Minnesota Court of Appeals contesting various aspects of the MDNR and MPCA decisions. During the first quarter of 2020, the Court of Appeals remanded the Permit to Mine and dam safety permits to the MDNR for a contested case hearing and the air permit to the MPCA with instructions to provide additional information. The Company, MDNR, and MPCA petitioned the Minnesota Supreme Court to review these decisions. Oral arguments were heard in October 2020 on the Permit to Mine and dam safety permits and in November 2020 on the air permit. In February 2021, the Minnesota Supreme Court overturned a decision by the Court of Appeals that had remanded the air permit back to the MPCA. The Supreme Court returned the case to the Court of Appeals to resolve items not specifically addressed in the Court of Appeals' original decision. PolyMet cannot act on these permits until the litigation is resolved of which the timing is uncertain. The realization of the Company’s investment in NorthMet and other assets is dependent upon various factors, including the existence of economically recoverable mineral reserves, the ability to obtain and maintain permits necessary to construct and operate NorthMet, the ability to obtain financing necessary to complete the development of NorthMet, and to conduct future profitable operations or alternatively, disposal of the investment on an advantageous basis. Given the ongoing development of the Project, the Company has experienced recurring losses from operations and net cash outflows for operating and investing activities, which are expected to continue until the Project is constructed and operational. As at December 31, 2020, the Company had cash of $3.554 million, a working capital deficiency of $15.241 million and an agreement with Glencore to issue unsecured convertible debentures to Glencore in four tranches with a total minimum principal amount of $20.0 million and total maximum principal amount of $30.0 million, the amount of each tranche to be determined jointly by the Company and Glencore. As of December 31, 2020, the Company had issued $23.0 million of convertible debentures to Glencore under this agreement. The final tranche of $7.0 million was issued subsequent to year end on January 28, 2021 (see Note 8). The Company believes it is probable it will continue to receive funding from Glencore or other financing sources, including funding from the issuance of unsecured convertible debentures, allowing the Company to satisfy future financial obligations, complete development of the Project and to conduct future profitable operations. Management's belief is based upon the underlying value of the Project, progress on obtaining and maintaining permits, ongoing discussions with potential financiers and the majority shareholder relationship with Glencore. Glencore has committed to provide financial support to enable the Company to continue its business operations for the next twelve months from the date of the consolidated financial statements. In late December 2019, a novel coronavirus ("COVID-19") was identified and subsequently spread worldwide. On March 11, 2020, the World Health Organization declared the COVID-19 outbreak a pandemic creating an unprecedented global health and economic crisis. COVID-19's impact on global markets has been significant. The duration and magnitude of COVID-19's effects on the economy, movement of goods and services, the copper market, and on the Company's financial and operational performance remains uncertain at this time. As of the date of these statements, there has not been any direct impact on the Company's operations as a result of COVID-19. The Company will continue to closely monitor the potential impact of COVID-19 on its business. Should the duration, spread or intensity of the COVID-19 pandemic deteriorate in the future, there could be a potentially material and negative impact on the Company's business, including the market for its securities, the ability to raise capital, and the valuation of its non-financial assets including mineral property, plant and equipment and intangibles due to sustained decreases in metal prices. Impacts from COVID-19 could also include a temporary cessation of operations due to a localized outbreak amongst Company personnel or in the Company's supply chain.

Basis of Preparation

Basis of Preparation	12 Months Ended
	Dec. 31, 2020
Basis Of Preparation [Abstract]
Basis of Preparation [Text Block]	2. Basis of Preparation a) Statement of Compliance The consolidated financial statements have been prepared in accordance with International Financial Reporting Standards ("IFRS") as issued by the International Accounting Standards Board ("IASB"). The financial statements were approved by the Board of Directors on March 18, 2021. Effective August 26, 2020, the Company completed a consolidation of its common shares at a ratio of ten pre-consolidation common shares for one post-consolidation common share. As a result of the consolidation, shares issuable pursuant to the Company's outstanding options, warrants, restricted share units and other convertible securities were proportionally adjusted on the same basis. All common share numbers, numbers of shares issuable under options, warrants and restricted share units and related per share amounts in these consolidated financial statements have been retrospectively adjusted to reflect the share consolidation. b) Basis of Consolidation and Preparation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. Intercompany balances and transactions have been eliminated on consolidation. The consolidated financial statements have been prepared under the historical cost basis, except for those assets and liabilities that are measured at revalued amounts or fair values at the end of each reporting period. All dollar amounts presented are in United States ("U.S.") dollars unless otherwise specified. c) Critical Accounting Estimates The preparation of consolidated financial statements in conformity with IFRS requires the use of certain critical accounting estimates. This requires management to make estimates that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as at the date of the financial statements. Critical accounting estimates used in the preparation of the consolidated financial statements are as follows: Determination of mineral reserves Reserves are estimates of the amount of product that can be economically extracted from the Company's property. In order to estimate reserves, estimates are required on a range of geological, technical and economic factors, including quantities, production techniques, production costs, capital costs, transport costs, metal prices and exchange rates. Estimating the quantity of reserves requires the size, shape and depth of deposits to be determined by analyzing geological data. This process may require complex and difficult geological judgments to interpret the data. In addition, management will form a view of forecast prices for its products, based on current and long-term historical average price trends. Changes in the proven and probable reserve estimates may impact the carrying value of property, plant and equipment, rehabilitation provisions, deferred tax amounts and depreciation, depletion and amortization. Provision for Environmental Rehabilitation Costs Provisions for environmental rehabilitation costs associated with mineral property, plant and equipment, are recognized when the Company has a present legal or constructive obligation that can be estimated reliably, and it is probable an outflow of economic benefits will be required to settle the obligation. Provisions are determined by discounting the expected future cash flows at a pre-tax risk-free rate reflecting current market assessments of the time value of money. The provision for environmental rehabilitation obligations represents management's best estimate of the present value of the future cash outflows required to settle the liability. The Company's estimates of its environmental rehabilitation liabilities could be affected by changes in regulations, changes in the extent of environmental rehabilitation required, changes in the means of rehabilitation, changes in the extent of responsibility for the financial liability, changes in operating plans or changes in cost estimates. Operations of the Company may in the future be affected from time to time in varying degrees by changes in environmental regulations, including those for future removal and site restoration costs. The likelihood of new regulations and overall effect upon the Company may vary greatly and are not predictable. d) Critical Accounting Judgments The preparation of consolidated financial statements in conformity with IFRS requires the use of certain critical accounting judgments. This requires management to make judgments that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as at the date of the financial statements. Critical accounting judgments used in the preparation of the consolidated financial statements are as follows: Impairment of non-financial assets The carrying amounts of non-financial assets, including mineral property, plant and equipment, and intangibles are reviewed at each reporting date, or when events or circumstances indicate the asset may not be recoverable, to determine whether there is any indication of impairment. If any such indication exists, the asset's recoverable amount is estimated at the greater of its value in use and its fair value less costs of disposal ("FVLCD"). In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset. NorthMet meets the criteria of a cash-generating unit as it is the smallest identifiable group of assets that generates cash inflows largely independent of the cash inflows from other assets or groups of assets. An impairment loss is recognized if the carrying amount of an asset exceeds its estimated recoverable amount. An impairment loss previously recorded is reversed if there has been a change in the estimates used to determine the recoverable amount resulting in an increase in the estimated service potential of an asset. The Company considers both external and internal sources of information in assessing whether there are any indications of impairment. External sources of information include changes in the market, economic, and legal environment in which the Company operates and that are not within its control and affect the recoverable amount. Internal sources of information include indications of economic performance of the asset. Going concern assumptions The Company must assess its ability to continue as a going concern and prepare financial statements on a going concern basis unless it either intends to liquidate or cease trading or has no realistic alternative but to do so. In assessing whether the going concern assumption is appropriate, the Company takes into account all available information about the future, which is at least, but is not limited to, twelve months from the end of the reporting period. e) Summary of Significant Accounting Policies Cash and Restricted Deposits Cash include amounts held in banks and highly liquid investments with original maturities of three months or less. Restricted deposits are held in a trust account and invested in highly liquid investments with a major financial institution as security and collateral primarily for legacy reclamation activities. Financial Assets All financial assets are initially recorded at fair value and designated upon inception as one of the following categories: fair value through profit or loss ("FVTPL") or amortized cost. Financial assets classified as FVTPL are measured at fair value with gains and losses recognized through profit and loss. Financial assets classified as amortized cost are measured at amortized cost using the effective interest method less any allowance for impairment. The effective interest method is a method of calculating the amortized cost of a financial asset and allocating interest income over the relevant period. The effective interest rate is the rate that discounts estimated future cash flows through the expected life of the financial asset, or, where appropriate, a shorter period. Loss allowances are recognized for Expected Credit Losses ("ECL") for amounts receivable and other assets not measured at FVTPL. Loss allowances for amounts receivable and other assets are measured at an amount equal to lifetime ECL. ECL is a probability-weighted estimate and measured as the present value of all cash shortfalls including the impact of forward looking information. The loss allowance is presented as a deduction to amounts receivable and other assets. Transaction costs associated with FVTPL financial assets are expensed as incurred, while transaction costs associated with amortized cost financial assets are included in the initial carrying amount of the asset (see Note 15). Mineral Property Exploration costs are incurred to discover mineral resources. Evaluation costs are incurred to assess the technical feasibility and commercial viability of the resources found. Exploration and evaluation costs are expensed as incurred. Capitalization of expenditures begins upon receipt and approval of a feasibility study confirming the technical feasibility and commercial viability of extracting the mineral resource ("Definitive Feasibility Study"). Development costs incurred subsequent to a Definitive Feasibility Study and mineral property acquisition costs are capitalized until the property is placed into production, sold, allowed to lapse or abandoned. Development costs are capitalized to the extent they are necessary to bring the property to commercial production and are directly attributable to an area of interest or capable of being reasonably allocated to an area of interest. Upon commencement of production, related mineral property acquisition and development costs will be amortized on a unit of production basis over the estimated proven and probable mineral reserves not to exceed the assets' useful lives. Plant and Equipment Plant and equipment are recorded at historical cost less accumulated depreciation and if applicable, accumulated impairment losses. Subsequent costs are included in the asset's carrying amount or recognized as a separate asset, as appropriate, if it is probable that the future economic benefits of the expenditure will flow to the Company and its cost can be measured reliably. The carrying amount of a replaced part is derecognized. All other repairs and maintenance are charged to the statement of loss and comprehensive loss during the period in which they are incurred. Depreciation of plant and equipment is calculated using the cost of the asset, less its residual value, over the estimated useful life of the asset on a unit of production or straight-line basis, as appropriate. Leases The Company recognizes a right-of-use asset and a lease liability at the lease commencement date. The right-of-use asset is initially measured at cost, which comprises the initial amount of the lease liability, plus any initial direct costs incurred and an estimate of costs to dismantle and remove the underlying asset or to restore the underlying asset or the site on which it is located, less any lease incentives received. The right-of-use asset is subsequently depreciated using the straight-line method from the commencement date to the earlier of the end of the useful life of the right-of-use asset or the end of the lease term. The lease liability is initially measured at the present value of the lease payments, discounted using the incremental borrowing rate. Intangibles Intangibles include wetland credits and software. Acquisition costs are capitalized until the asset is used, sold, or abandoned. Wetland credits are used to offset and mitigate wetlands disturbed during construction and operation of the Project. As such, costs will be transferred to Mineral Property, Plant and Equipment once placed into service and amortized on a unit of production basis over the estimated proven and probable mineral reserves not to exceed the assets' useful lives. Software is amortized over the useful life once placed into service. Financial Liabilities All financial liabilities are initially recorded at fair value and designated upon inception as FVTPL or other financial liabilities. Financial liabilities classified as FVTPL are initially recognized at fair value with directly attributable transaction costs expensed as incurred. At the end of each reporting period, financial liabilities at FVTPL are measured at fair value, with changes in fair value recognized directly in profit or loss in the period in which they arise. Financial liabilities classified as other financial liabilities are initially recognized at fair value less directly attributable transaction costs and subsequently measured at amortized cost using the effective interest method which calculates the amortized cost of a financial liability and allocates interest expense over the expected life of the financial liability. Exchanges of instruments and modifications to debt are assessed using quantitative and qualitative factors to consider whether the exchange or modification constitutes an extinguishment of the original financial liability and establishment of a new financial liability. In the case of extinguishment, any fees or costs incurred are recognized in profit or loss in the period in which they arise. Where the terms in an exchange or modification are not assessed to be substantially different, a modification gain or loss is recognized at an amount equal to the difference between the modified cash flows discounted at the original effective interest rate and the carrying value of the debt. The carrying value of the debt is adjusted for this modification gain or loss, directly attributable transaction costs, and any cash paid to or received from the debt holder (see Note 15). Borrowing costs Borrowing costs directly attributable to the acquisition, construction or production of a qualifying asset are capitalized as part of the cost of that asset until such time as the asset is substantially complete and ready for its intended use or sale. Where funds have been borrowed specifically to finance an asset, the amount capitalized is the actual borrowing costs incurred. Where the funds used to finance an asset form part of general borrowings, the amount capitalized is calculated using a weighted average of rates applicable to relevant borrowings of the Company during the period. Other borrowing costs not directly attributable to a qualifying asset are expensed in the year incurred. Classification in the cash flow statement is in accordance with the classification of the underlying asset to which those payments were capitalized. Share-Based Compensation All share-based compensation awards made to directors, employees and non-employees are measured and recognized using a fair value based method. For directors and employees, or those providing services similar to employees, the fair value of options is determined using the Black-Scholes pricing model. The fair value of the bonus shares, restricted shares, and restricted share units expected to be settled in shares is amortized over the vesting period. For awards expected to be settled in cash, the change in market value and corresponding liability is adjusted to fair value at each reporting period. The award is accrued and charged over the vesting period either to operations or mineral property, plant and equipment, with the offsetting credit to equity reserves for equity settled awards or liabilities for cash settled awards. If and when share options are ultimately exercised or bonus shares, restricted shares, and restricted share units vest, the applicable amounts are transferred to share capital or removed from liabilities. Certain awards vest upon achievement of non-market performance conditions. On a quarterly basis, management assesses the probability of achieving those performance conditions using the best available information and estimates the appropriate vesting period. When the Company amends the terms of share options, the incremental change in the fair value of the options due to the amendment, as determined using the Black-Scholes pricing model, is recognized over the vesting period in the statement of loss or capitalized as appropriate. Share Purchase Warrants The Company issues share purchase warrants in connection with certain financing transactions. The fair value of the warrants, as determined using the Black-Scholes pricing model or fair value of goods or services received, is credited to equity reserves. The recorded value of share purchase warrants is transferred to share capital upon exercise. Foreign Currency Translation The U.S. dollar is the functional currency of the Company and its wholly-owned subsidiary. Amounts in the consolidated financial statements are expressed in U.S. dollars unless otherwise stated. Transactions in foreign currencies are translated into the functional currency at the exchange rates at the date of the transactions. Monetary assets and liabilities of the Company's operations denominated in a currency other than the U.S. dollar are translated using exchange rates prevailing at the balance sheet date. Revenue and expense items are translated at the exchange rates in effect at the date of the underlying transaction. Exchange differences are recognized in net loss in the year in which they arise. Loss Per Share Loss per share is computed by dividing the loss for the year by the weighted average number of common shares outstanding during the year. Basic and diluted loss per share for each year presented are the same due to the effect of potential issuances of shares under warrant or share option agreements being, in total, anti-dilutive. Income Taxes and Deferred Taxes The income tax expense or benefit for the year consists of current and deferred. Current tax is the expected tax payable or receivable on the taxable profit or loss for the year. Current tax is calculated using tax rates and laws that were enacted or substantively enacted at the balance sheet date in each of the jurisdictions and includes any adjustments for taxes payable or recovery in respect of prior periods. Taxable profit or loss differs from profit or loss as reported in the Consolidated Statements of Loss and Comprehensive Loss because of items of income or expense that are taxable or deductible in other years, and items that are never taxable or deductible. Deferred tax is recognized on temporary differences between the carrying amounts of assets and liabilities in the financial statements and the corresponding tax basis used in the computation of taxable profit. Deferred tax liabilities are generally recognized for all taxable temporary differences not eligible for offset. Deferred tax assets are generally recognized for all deductible temporary differences, loss carry forwards and tax credit carry forwards to the extent that it is probable that taxable profits will be available against which they can be utilized. To the extent that the Company does not consider it to be probable that taxable profits will be available against which deductible temporary differences, loss carry forwards, and tax credit carry forwards can be utilized, a deferred tax asset is not recognized.

Mineral Property Agreements

Mineral Property Agreements	12 Months Ended
	Dec. 31, 2020
Disclosure Of Mineral Property Agreements [Abstract]
Mineral Property Agreements [Text Block]	3. Mineral Property Agreements NorthMet, Minnesota, U.S.A. Pursuant to an agreement dated January 4, 1989, subsequently amended and assigned, the Company leases certain mineral property rights in St. Louis County, Minnesota from RGGS Land & Minerals Ltd., L.P. Provided the Company continues to make annual lease payments, the lease period continues until June 12, 2048 with an option to extend the lease for up to five additional ten-year periods on the same terms and further extend as long as there are commercial mining operations. All lease payments have been paid to date with the next annual payment of $0.175 million due in January 2022. Pursuant to an agreement dated December 1, 2008, the Company leases certain mineral property rights in St. Louis County, Minnesota from LMC Minerals. Provided the Company continues to make annual lease payments, the lease period continues until December 1, 2028 with an option to extend the lease for up to four additional five-year periods on the same terms. All lease payments have been paid to date with the next annual payment of $0.030 million due in November 2021. The lease payments are considered advance royalty payments and will be deducted from future production royalties payable to the lessor, which range from 3% to 5% based on the net smelter return per ton received by the Company. The Company's recovery of $3.370 million in advance royalty payments to RGGS Land & Minerals Ltd., L.P. is subject to the lessor receiving an amount not less than the amount of the annual lease payment due for that year. The Company's recovery of $0.279 million in advance royalty payments to LMC Minerals is subject to the lessor receiving an amount not less than the amount of the annual lease payment due for that year.

Mineral Property, Plant and Equ

Mineral Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [abstract]
Mineral Property, Plant and Equipment [Text Block]	4. Mineral Property, Plant and Equipment Details of the Mineral Property, Plant and Equipment are as follows: Net Book Value Mineral Property Plant and Equipment Total Balance at December 31, 2019 $ 409,356 $ 776 $ 410,132 Additions 7,668 255 7,923 Disposals — (9 ) (9 ) Changes to environmental rehabilitation provision (Note 6) (2,315 ) — (2,315 ) Amortization and depreciation — (172 ) (172 ) Balance at December 31, 2020 414,709 850 415,559 Gross carrying value 461,877 2,166 464,043 Accumulated depreciation and impairment $ (47,168 ) $ (1,316 ) $ (48,484 ) Net Book Value Mineral Property Plant and Equipment Total Balance at January 1, 2019 $ 433,347 $ 201 $ 433,548 Additions 33,956 746 34,702 Disposals (867 ) — (867 ) Changes to environmental rehabilitation provision (Note 6) (9,912 ) — (9,912 ) Asset Impairment (47,168 ) — (47,168 ) Amortization and depreciation — (171 ) (171 ) Balance at December 31, 2019 409,356 776 410,132 Gross carrying value 456,524 1,931 458,455 Accumulated depreciation and impairment $ (47,168 ) $ (1,155 ) $ (48,323 ) Mineral Property December 31, 2020 December 31, Mineral property acquisition and interest costs $ 79,625 $ 79,625 Mine plan and development 52,178 51,388 Environmental 146,094 142,814 Consulting and wages 61,653 58,610 Reclamation and remediation (Note 6) 44,584 46,899 Site activities 30,497 29,942 Mine equipment 78 78 Total $ 414,709 $ 409,356 In November 2005, the Company acquired from Cliffs Erie LLC, a subsidiary of Cleveland Cliffs Inc. (together "Cliffs") large parts of a processing facility located approximately six miles from the ore body. In December 2006, the Company acquired from Cliffs additional property and associated rights sufficient to provide it with a railroad connection linking the mine development site and the processing facility. The transaction also included a railcar fleet, locomotive fueling and maintenance facilities, water rights and pipelines, administrative offices on site and an additional 6,000 acres of land to the east and west of the existing tailings storage facilities. The consideration paid for the processing facility and associated infrastructure was $18.9 million in cash and $13.953 million in shares. As part of the consideration, the Company indemnified Cliffs for reclamation and remediation obligations of the acquired property (see Note 6). During 2020, the Company capitalized development costs of $7.668 million (2019 - $19.205 million) necessary to bring the Project to commercial production. In addition, borrowing costs directly attributable to the Project were capitalized in the amount of $ nil The Company regularly assesses whether there are indicators of asset impairment. During the first quarter of 2020, indicators were identified, including updates to the Project and developments related to ongoing legal challenges, which potentially affect the timing of the Project. The recoverable amounts of mineral property, plant and equipment and intangibles were measured based on fair value less costs of disposal ("FVLCD"), determined by assessing future expected cash flows based on future business plans supported by life of mine plans. The valuation assessment uses the most recent reserve and resource estimates, relevant cost assumptions and market forecasts of commodity prices discounted using an operation specific weighted average cost of capital. The determination of FVLCD used Level 3 valuation techniques (see Note 15). Based on the results of the Company's recoverability analysis, the FVLCD exceeded the carrying amount of the assets and no impairment was required during the first quarter of 2020. No indicators of asset impairment were identified during the second, third, or fourth quarters of 2020.

Intangibles

Intangibles	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about intangible assets [abstract]
Intangibles [Text Block]	5. Intangibles Details of the Intangibles are as follows: Year ended December 31, 2020 2019 Intangibles - beginning of period $ 24,380 $ 24,185 Additions 62 195 Amortization (52 ) — Intangibles - end of period 24,390 24,380 Gross carrying value 24,442 24,380 Accumulated amortization and impairment $ (52 ) $ — In October 2017, the Company entered into an agreement with EIP Credit Co., LLC to reserve wetland mitigation bank credits the Company can use for the Project for a minimum of five years During 2020, the Company capitalized $0.062 million related to software costs (December 31, 2019 - $0.195 million). As at December 31, 2020, the carrying amount of software intangibles was $0.205 million (December 31, 2019 - $0.195 million).

Environmental Rehabilitation Pr

Environmental Rehabilitation Provision	12 Months Ended
	Dec. 31, 2020
Disclosure Of Environmental Rehabilitation Provision [Abstract]
Environmental Rehabilitation Provision [Text Block]	6. Environmental Rehabilitation Provision Details of the Environmental Rehabilitation Provision are as follows: Year ended December 31, 2020 2019 Environmental Rehabilitation Provision - beginning of period $ 52,525 $ 61,107 Change in estimate (2,315 ) (9,912 ) Liabilities discharged (543 ) (742 ) Accretion expense 2,083 2,072 Environmental Rehabilitation Provision - end of period 51,750 52,525 Less current portion (893 ) (1,276 ) Non-current portion $ 50,857 $ 51,249 Federal, state and local laws and regulations concerning environmental protection affect the Company's assets. As part of the consideration for the asset acquisitions from Cliffs (see Note 4), the Company indemnified Cliffs for reclamation and remediation obligations of the acquired property. The Company's provisions are based upon existing laws and regulations. It is not currently possible to estimate the impact on operating results, if any, of future legislative or regulatory developments. The Company's best estimate of the environmental rehabilitation provision as at December 31, 2020 was $51.750 million (December 31, 2019 - $52.525 million) based on estimated cash flows required to settle this obligation in present day costs of $67.597 million (December 31, 2019 - $70.480 million), a projected inflation rate of 2.0% (December 31, 2019 - 2.2%), a market risk-free nominal interest rate of 3.7% (December 31, 2019 - 4.0%) and expenditures expected to occur over a period of approximately 30 years. During 2019, the Company changed its estimate for determining the discount rate in order to better reflect the expected rates over the period of future cash flows. This change in estimate resulted in a $9.9 million decrease to the environmental rehabilitation provision during 2019 and was accounted for prospectively as a change in accounting estimate in accordance with IAS 8, Accounting Policies, Changes in Accounting Estimates, and Errors. The carrying value of the provision is sensitive to the estimates and assumptions used in its measurement. If the discount rate had been 1% lower than management's estimate, the liability would have increased by $8.2 million as at December 31, 2020 and conversely, if the discount rate had been 1% higher than management's estimate, the liability would have decreased by $6.6 million as at December 31, 2020. On November 1, 2018, the Company received the Permit to Mine and certain other permits for the Project from the MDNR which included a schedule for financial assurance obligations, including required cash contributions to a trust fund. The Company has satisfied its current financial assurance obligations primarily by establishing and contributing $10.0 million in restricted deposits to a trust fund and providing $65.0 million in surety bonds and letters of credit, with the MDNR as the beneficiary in each case. Financial assurance obligations are reviewed annually based on the Company's planned reclamation activities, with the total assurance and related financial instruments adjusted accordingly. The Company may terminate these financial instruments, partially or in full, only upon fulfilling site reclamation requirements and receiving approval from the MDNR. Future required cash contributions to the trust fund are $2.0 million per year beginning in the first year of mining operations and continue until the eighth year after which annual contributions will be prorated based on the expected reclamation obligation at the end of mining. In addition, the Company provided Cliffs with a $13.4 million letter of credit to satisfy requirements under the asset acquisition agreements and related obligations. There were no changes in the financial assurance obligations during 2020. As at December 31, 2020, the trust fund balance was $12.725 million (December 31, 2019 - $11.198 million).

Glencore Financing

Glencore Financing	12 Months Ended
	Dec. 31, 2020
Disclosure Of Glencore Financing [Abstract]
Glencore Financing [Text Block]	7. Glencore Financing Since October 2008, the Company and Glencore have entered into a series of financing agreements resulting in the following financial interests as at December 31, 2020: Equity (see Note 10) - 72,008,404 common shares of the Company acquired between 2009 and 2019 which represent 71.5% of the Company's issued shares; Convertible debt (see Note 8) - $23.0 million initial principal unsecured convertible debentures due March 31, 2023; and Promissory note (see Note 9) - $15.0 million initial principal note due December 31, 2021. See additional discussion of Glencore agreements in Notes 8, 9, and 10.

Convertible Debt

Convertible Debt	12 Months Ended
	Dec. 31, 2020
Disclosure Of Convertible Debt [Abstract]
Convertible Debt [Text Block]	8. Convertible Debt Details of the Convertible Debt are as follows: Year ended December 31, 2020 2019 Convertible Debt - beginning of period $ — $ 56,984 Fair value of debenture funding 17,912 — Change due to modification — 792 Accretion and capitalized interest 835 2,105 Repayment — (59,881 ) Convertible Debt - end of period $ 18,747 $ — During 2008 and 2009, the Company issued $25.0 million of secured convertible debentures to Glencore. The Company provided security on these debentures covering all of the assets of PolyMet. Interest was compounded quarterly and payable by increasing the principal amount of the debentures. On March 22, 2019, the Company entered into an extension agreement with Glencore with respect to the secured convertible and non-convertible debt set to mature on March 31, 2019. Glencore agreed to extend the maturity date of the debt to June 30, 2019 to provide the Company time to complete a rights offering, fully backstopped by Glencore, to raise sufficient funds to repay all outstanding debt. In connection with the extension agreement, the Company issued 6,458,001 purchase warrants to Glencore with an expiration date of March 31, 2024 and an exercise price of $0.7368 which was approved by the NYSE American and TSX. In addition, the Company agreed to extend the expiration date of the convertible debt exchange warrant to the earlier of March 31, 2020 or the date on which the convertible debt is fully repaid, which occurred on June 28, 2019. The March 2019 transaction was accounted for as a modification of the existing debentures with a $2.014 million modification loss consisting of the following: • • • Upon closing of the Rights Offering, these debentures were fully repaid on June 28, 2019. Since inception, $34.881 million of interest was capitalized to the principal amount of the debenture. All borrowing costs were eligible for capitalization and $2.105 million was capitalized during 2019. On March 17, 2020, the Company agreed to issue unsecured convertible debentures to Glencore in four tranches with a total minimum principal amount of $20.0 million and total maximum principal amount of $30.0 million, the amount of each tranche to be determined jointly by the Company and Glencore. The debentures are due on the earlier of March 31, 2023 or upon US$100 million of Project financing. Interest accrues on the unsecured debentures balance drawn at 4% per annum and the principal amount of the debentures is convertible into common shares of the Company at a conversion price equal to $2.223. The first tranche in the amount of $7.0 million was issued on March 18, 2020, the second tranche in the amount of $7.0 million was issued on June 23, 2020 and the third tranche in the amount of $9.0 million was issued on September 30, 2020. The final tranche of $7.0 million was issued subsequent to year end on January 28, 2021. The convertible debenture proceeds were bifurcated between the debt and equity components. The fair value of the debt component was estimated using a discounted cash flow model method. Transaction costs for the financing was $0.112 million. The fair value of the debt components issued during 2020 was $17.912 million with the residual of $4.976 million allocated to equity. The debt component has been recorded at amortized cost, net of transaction costs, and is being accreted to face value over the expected life using the effective interest method. No borrowing costs were capitalized during 2020.

Non-Convertible Debt and Promis

Non-Convertible Debt and Promissory Note	12 Months Ended
	Dec. 31, 2020
Disclosure Of Non Convertible Debt And Promissory Note [Abstract]
Non-Convertible Debt and Promissory Note [Text Block]	9. Non-Convertible Debt and Promissory Note Details of the Non-Convertible Debt are as follows: Year ended December 31, 2020 2019 Non-Convertible Debt - beginning of period — 178,483 Change due to modification (Note 7) — (352 ) Accretion and capitalized interest — 12,305 Repayment — (190,436 ) Non-Convertible Debt - end of period — — Since January 2015, the Company issued $140.0 million of secured non-convertible debentures to Glencore. The Company provided security on these debentures covering all of the assets of PolyMet. Interest was compounded quarterly and payable by increasing the principal amount of the debentures. On March 22, 2019, the Company entered into an extension agreement with Glencore with respect to the secured convertible and non-convertible debt set to mature on March 31, 2019. Glencore agreed to extend the maturity date of the debt to June 30, 2019 to provide the Company time to complete a rights offering, fully backstopped by Glencore, to raise sufficient funds to repay all outstanding debt. See further discussion of the transaction in Note 8. Upon closing of the Rights Offering, these debentures were fully repaid on June 28, 2019. Since inception, $50.436 million of interest was capitalized to the principal amount of the debenture. All borrowing costs were eligible for capitalization and $12.305 million was capitalized during 2019. Details of the Promissory Note are as follows: Year ended December 31, 2020 2019 Promissory Note - beginning of period $ 15,501 $ — Funding, net of costs — 15,000 Accretion and capitalized interest 1,128 501 Promissory Note - end of period $ 16,629 $ 15,501 On August 7, 2019, the Company issued to Glencore a promissory note in the amount of $15.0 million with proceeds to be used for general corporate purposes. The promissory note bears interest at three month U.S. dollar LIBOR plus 6.0% and is payable on the earlier of (i) December 31, 2021 or (ii) the availability of at least $100 million of debt or equity financing, on which date all principal and interest accrued to such date will be due and payable. Since inception, $1.629 million of interest has been capitalized to the principal amount of the promissory note. Borrowing costs of $0.341 million were eligible for and were capitalized during 2019. No borrowing costs were capitalized during 2020.

Share Capital

Share Capital	12 Months Ended
	Dec. 31, 2020
Disclosure of classes of share capital [abstract]
Share Capital [Text Block]	10. Share Capital a) Issuances for Cash and Land Acquisition On May 24, 2019, the Company filed a prospectus for an offering of rights to holders of common shares of the Company to raise up to $265.0 million in gross proceeds (“Rights Offering”). Every shareholder received one right ("Right") for each common share owned on June 3, 2019, the Record Date, and each Right entitled the holder to acquire 2.119069 new common shares of the Company at $0.3881 per share. This offering of Rights expired on June 26, 2019. Under the terms of a Standby Purchase Agreement, Glencore agreed to purchase any common shares not subscribed for by holders of Rights, subject to certain conditions. Because the Rights Offering was not fully subscribed, Glencore purchased 430,521,941 common shares under its standby commitment in addition to the 196,726,042 common shares purchased under Glencore’s Rights which resulted in Glencore owning 71.6% of the Company’s issued shares. Upon closing of the Rights Offering on June 28, 2019, the Company issued a total of 682,813,838 common shares for gross proceeds of $265.0 million. Expenses and fees relating to the Rights Offering were $11.953 million, including a $7.690 million standby commitment fee paid to Glencore, and reduced the gross proceeds recorded as share capital. Closing of the Rights Offering triggered customary anti-dilution provisions for outstanding warrants, share options, and unissued restricted share units. Proceeds of the Rights Offering were used to repay the convertible debt of $59.881 million owed to Glencore and non-convertible debt of $190.436 million owed to Glencore (see Notes 8 and 9). The Company and Glencore agreed to net settle Glencore’s Rights Offering subscription amount of $243.435 million against the debt amounts owed. During 2020, the Company issued nil nil During 2020, the Company issued nil nil On June 24, 2020, shareholders approved the proposed consolidation of the issued and outstanding common shares of the Company on the basis of up to ten (10) pre-consolidation shares for every one (1) post-consolidation share and further authorized the Board of Directors to determine when and if to effect such consolidation. Effective August 26, 2020, the Company completed the consolidation at a ratio of ten pre-consolidation common shares for one post-consolidation common share. b) Share-Based Compensation The Omnibus Share Compensation Plan (“Omnibus Plan”) was created to align the interests of the Company’s employees, directors, officers and consultants with those of shareholders. Effective May 25, 2007, the Company adopted the Omnibus Plan, which was approved by the Company’s shareholders on June 27, 2007, modified and further ratified and reconfirmed by the Company’s shareholders most recently on June 27, 2018. The Omnibus Plan restricts the award of share options, restricted shares, restricted share units, and other share-based awards to 10% of the common shares issued and outstanding on the grant date, excluding 250,000 common shares underlying options pursuant to an exemption approved by the Toronto Stock Exchange. During 2020, the Company recorded $2.193 million for share-based compensation (2019 - $ 2.055 c) Share Options Share options granted may not exceed a term of ten years and the expiration date is accelerated if the grantee ceases to be an eligible person under the Omnibus Plan. Details of the share options outstanding are as follows: Year ended December 31, 2020 2019 Number of Options Weighted Average Exercise Price Number of Options Weighted Average Exercise Price Outstanding - beginning of period 2,406,600 $ 7.68 2,269,200 $ 9.11 Granted 25,000 3.90 362,500 8.10 Exercised — — (62,500 ) 7.11 Expired (136,400 ) 9.84 (162,600 ) 10.09 Anti-dilution adjustment — — — (1.21 ) Outstanding - end of period 2,295,200 $ 7.51 2,406,600 $ 7.68 Range of Exercise Prices Number of options outstanding Number of options exercisable Weighted Average Exercise Price Weighted Average Remaining Life 3.90 1,048,500 1,048,500 $ 6.27 1.44 7.01 966,700 896,800 7.68 2.79 8.71 to 13.00 175,000 175,000 9.21 2.38 13.01 to 16.30 105,000 105,000 15.61 0.15 2,295,200 2,225,300 $ 7.51 2.02 As at December 31, 2020 all outstanding share options had vested and were exercisable, with the exception of 69,900, which are scheduled to vest upon production. The outstanding share options have expiry periods between 0.07 and 9.49 years and are expected to primarily be settled in shares upon exercise. During 2020, the Company granted 25,000 share options (2019 - 362,500) which had a fair value of $0.057 million (2019 - $1.042 million) to be expensed and capitalized over the vesting periods. The fair value of share options granted were estimated at the date of grant using the Black-Scholes pricing model with the following weighted average assumptions: Year ended December 31, 2020 2019 Risk-free interest rate 0.33 % 2.52 % Expected dividend yield — — Expected forfeiture rate — — Expected volatility 71.88 % 54.56 % Expected life in years 5.00 2.50 Weighted average fair value of each option $ 2.27 $ 2.87 The expected volatility reflects the Company’s expectation that historical volatility over a period similar to the life of the option is indicative of future trends, which may or may not necessarily be the actual outcome. Effective June 28, 2019, the Company reduced the exercise price of all options that were outstanding prior to the Rights Offering, to reflect the dilutive effect of the common shares that were issued in connection with the Rights Offering. The adjustment did not impact the financial statements. d) Restricted Shares and Restricted Share Units Restricted shares and restricted share units granted are forfeited if the grantee ceases to be an eligible person under the Omnibus Plan. Details of the restricted shares and restricted share units are as follows: Year ended December 31, 2020 2019 Outstanding - beginning of period 464,886 334,791 Granted 918,252 172,587 Vested (221,979 ) (104,937 ) Forfeited (10,099 ) — Anti-dilution adjustment — 62,445 Rounding due to share consolidation (25 ) — Outstanding - end of period 1,151,035 464,886 As at December 31, 2020, outstanding restricted shares and restricted share units are scheduled to vest upon completion of specific targets or dates (Construction Finance - 86,557; Production - 45,261; January 2021 - 152,312; January 2022 - 800,459 and Other - 6,250). The remaining 60,196 outstanding restricted share units have vested but share delivery is deferred until retirement, termination, or death. The Company expects 418,187 outstanding restricted share units will be settled in cash and the remainder will be settled in shares as allowed under the Omnibus Plan. During 2020, the Company granted 918,252 restricted share units (2019 - 172,587) which had a fair value of $2.389 million (2019 - $1.355 million) to be expensed and capitalized over the vesting periods. During 2020, there were nil Effective June 28, 2019, the Company increased the number of common shares issuable for all restricted share units outstanding prior to the Rights Offering, to reflect the dilutive effect of the common shares that were issued in connection with the Rights Offering. The adjustment did not impact the financial statements. e) Bonus Shares The bonus share incentive plan was established for the Company’s directors and key employees and was approved by the disinterested shareholders at the Company’s shareholders’ meeting held in May 2004. The Company has authorized 364,000 bonus shares for the achievement of Milestone 4 representing commencement of commercial production at NorthMet. At the Company's Annual General Meeting of shareholders held in June 2008, the disinterested shareholders approved issuance of these shares upon achievement of Milestone 4. Regulatory approval is also required prior to issuance of these shares. The fair value of these unissued bonus shares has been fully amortized. Details of the bonus shares are as follows: Year ended December 31, 2020 2019 Allocated Authorized & Unissued Allocated Authorized & Unissued Outstanding - beginning of period 270,000 364,000 270,000 364,000 Outstanding - end of period 270,000 364,000 270,000 364,000 f) Share Purchase Warrants Details of the share purchase warrants are as follows: Year ended December 31, 2020 2019 Number of Purchase Warrants Weighted Average Exercise P rice Number of Purchase Warrants Weighted Average Exercise Price Outstanding - beginning of period 3,137,918 $ 8.04 2,718,971 $ 9.49 Granted — — 645,800 7.37 Expired — — (645,800 ) 8.23 Anti-dilution adjustment — — 418,947 (1.20 ) Outstanding - end of period 3,137,918 $ 8.04 3,137,918 $ 8.04 The outstanding share purchase warrants have expiry periods between 0.80 years and 3.25 years, subject to acceleration in certain circumstances. Effective June 28, 2019, the Company increased the number of common shares issuable and reduced the exercise price of all warrants that were outstanding prior to the Rights Offering, to reflect the dilutive effect of the common shares that were issued in connection with the Rights Offering. The adjustment did not impact the financial statements. The fair value of share purchase warrants granted were estimated at the date of grant using the Black-Scholes pricing model with the following weighted average assumptions: Year ended December 31, 2020 2019 Risk-free interest rate — 2.18 % Expected dividend yield — — Expected forfeiture rate — — Expected volatility — 52.59 % Expected life in years — 3.00 Weighted average fair value of each warrant $ — $ 2.42 The expected volatility reflects the Company’s expectation that historical volatility over a period similar to the life of the warrant is indicative of future trends, which may or may not necessarily be the actual outcome.

Finance Costs - Net

Finance Costs - Net	12 Months Ended
	Dec. 31, 2020
Disclosure Of Finance Costs Net [Abstract]
Finance Costs - Net [Text Block]	11. Finance Costs - Net Details of net finance costs are as follows: Year ended December 31, 2020 2019 Debt accretion and capitalized interest: Promissory note (Note 9) $ 1,128 $ 501 Convertible debt (Note 8) 835 2,105 Non-convertible debt (Note 9) — 12,305 Less: amounts capitalized on qualifying assets — (14,751 ) Environmental rehabilitation accretion (Note 6) 2,083 2,072 Restricted deposit income (1,527 ) (1,163 ) Cash interest income (23 ) (218 ) Other finance (income) costs (1,452 ) 681 Finance costs - net $ 1,044 $ 1,532

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2020
Related party transactions [abstract]
Related Party Transactions [Text Block]	12. Related Party Transactions The Company conducted transactions with senior management, directors and persons or companies related to these individuals, and paid or accrued amounts as follows: Year ended December 31, 2020 2019 Salaries and other short-term benefits $ 2,351 $ 2,247 Other long-term benefits 59 47 Share-based payment (1) 1,781 1,917 Total $ 4,191 $ 4,211 (1) Agreements with senior management contain severance provisions in certain circumstances, including, for example, for termination without cause, in the event of a change in control, or in the event of the employee having good reason. Other than Jonathan Cherry, no PolyMet director has an agreement providing for benefits upon termination. As a result of Glencore's ownership of 71.5% it is also a related party. In addition to the transactions described in Notes 7, 8 and 9 the Company is party to a Technical Services Agreement with Glencore whereby the Company reimburses Glencore for Project technical support costs requested under an agreed scope of work, primarily in detailed project design and mineral processing. During 2020, the Company recorded $0.309 million (2019 - $0.474 million) for services under this agreement.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Major components of tax expense (income) [abstract]
Income Taxes [Text Block]	13. Income Taxes a) Effective tax rate The effective tax rate differs from the cumulative Canadian federal and provincial income tax rate due to the following: Year ended December 31, 2020 2019 Loss for the year before taxes $ (20,830 ) $ (57,903 ) Combined statutory tax rate 27.0% 27.0% Expected tax recovery (5,624 ) (15,634 ) Difference in foreign tax rates (303 ) (914 ) Non-deductible items — 541 Change in unrecognized deferred tax and other items 5,927 16,007 Income Tax Expense / (Recovery) $ — $ — b) Deferred income tax assets and liabilities Deferred income tax assets and liabilities have been recognized in respect of the following items: Year ended December 31, 2020 2019 Non-capital loss carry forward assets $ 17,738 $ 16,994 Mineral property acquisition, exploration and development costs (17,738 ) (16,994 ) Net deferred income tax liabilities $ — $ — Deferred income tax assets have not yet been recognized in respect of the following items: Year ended December 31, 2020 2019 Non-capital loss carry forward assets $ 46,414 $ 41,104 Capital loss carry forward assets 360 360 Intercompany receivable assets 2,690 2,690 Other assets 4,186 4,288 Unrecognized deferred income tax assets $ 53,650 $ 48,442 As at December 31, 2020, the Company has Canadian non-capital loss carry forwards of approximately $60.1 million (December 31, 2019 - $53.8 million), which expire between 2026 and 2040. The Company also has US federal non-capital loss carry forwards of approximately $167.5 million (December 31, 2019 - $152.3 million), of which approximately $134.2 million were generated prior to 2018 and expire between 2021 and 2037. The remaining $33.3 million were generated in tax years since 2018 and do not expire. The Company’s US state non-capital loss carry forwards expire between 2021 and 2035. Further, US net operating loss carry forwards may be subject to an annual limitation in the event of a 50% or greater change of ownership within a 3 year period as defined under Section 382 of the Internal Revenue Code. The Company is not recognizing these deferred tax assets because they relate to entities with a history of losses and there is not convincing evidence that future taxable income will enable timely offset.

Commitments And Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2020
Disclosure Of Commitments And Contingencies [Abstract]
Commitments and Contingencies [Text Block]	14. Commitments and Contingencies In the normal course of business, the Company enters into contracts that give rise to firm commitments for future minimum payments. In addition to items described elsewhere in these financial statements, the following table summarizes the Company's contractual obligations as at December 31, 2020: Contractual Obligations Carrying Value Contractual Cash flows Less than 1 year 1 - 3 years 3 - 5 years More than 5 years Accounts payable and accruals $ 3,392 $ 3,392 $ 2,755 $ 637 $ — $ — Lease liability 557 659 145 297 217 — Promissory note (Note 9) 16,629 16,919 16,919 — — — Convertible debt (Note 8) 18,747 24,056 — 24,056 — — Firm commitments — 436 64 284 88 — Total $ 39,325 $ 45,462 $ 19,883 $ 25,274 $ 305 $ — The Company is involved in various claims, litigation and other matters arising in the ordinary course and conduct of business. While it is not possible to determine the ultimate outcome of such actions at this time, and inherent uncertainties exist in predicting such outcomes, it is the Company's belief that the ultimate resolution of such actions is not reasonably likely to have a material adverse effect on its consolidated financial position or results of operations. The assessment of contingencies inherently involves the exercise of significant judgment and estimates of the outcome of future events. As a result of the assessment, no significant contingent liabilities

Financial Instruments and Risk

Financial Instruments and Risk Management	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about financial instruments [abstract]
Financial Instruments and Risk Management [Text Block]	15. Financial Instruments and Risk Management The carrying values of each classification of financial instrument as at December 31, 2020 are: Amortized Cost Fair value through profit or loss Total carrying value Financial assets Cash $ 3,554 $ — $ 3,554 Restricted deposits 575 12,401 12,976 Amounts receivable and other assets 650 2,382 3,032 Total financial assets 4,779 14,783 19,562 Financial liabilities Accounts payable and accruals 2,620 772 3,392 Convertible debt 18,747 — 18,747 Promissory note 16,629 — 16,629 Lease liabilities 557 — 557 Total financial liabilities $ 38,553 $ 772 $ 39,325 The carrying values of each classification of financial instrument as at December 31, 2019 are: Amortized Fair value through Total carrying value Financial assets Cash $ 7,401 $ — $ 7,401 Restricted deposits 809 10,640 11,449 Amounts receivable and other assets 738 2,176 2,914 Total financial assets 8,948 12,816 21,764 Accounts payable and accruals 4,408 125 4,533 Promissory note 15,501 — 15,501 Lease liabilities 616 — 616 Total financial liabilities $ 20,525 $ 125 $ 20,650 Fair Value Measurements The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: Level 1 - Level 2 - Level 3 - Financial instruments measured at fair value subsequent to recognition include restricted deposits (see Note 6) measured at fair value through profit or loss using Level 1 inputs resulting in a carrying value of $12.401 million (December 31, 2019 - $10.640 million), amounts receivable measured at fair value through profit or loss using Level 3 inputs resulting in a carrying value of $2.382 million (December 31, 2019 - $2.176 million) and accruals for expected payments to settle restricted share units measured at fair value through profit or loss using Level 2 inputs resulting in a carrying value of $0.772 million (December 31, 2019 - $0.125 million). The fair values of the convertible debt and promissory note approximate the carrying amount at amortized cost using the effective interest method. The fair values of other financial assets and other financial liabilities approximate their carrying amounts due to their short-term nature. Risks Arising from Financial Instruments and Risk Management The Company's activities expose it to a variety of financial risks: market risk (including currency and interest rate), credit risk, and liquidity risk. Reflecting the current stage of development of the Company's Project, the overall risk management program focuses on facilitating the Company's ability to continue as a going concern and seeks to minimize potential adverse effects on the Company's ability to execute its business plan. Risk management is the responsibility of executive management. Material risks are identified and monitored and are discussed with the Audit Committee and the Board of Directors. Currency Risk The Company incurs expenditures in Canada and the United States. The functional and reporting currency of the Company and its subsidiary is the U.S. dollar. Foreign exchange risk arises because the amount of Canadian dollar cash, amounts receivable, or accounts payable and accruals will vary in U.S. dollar terms due to changes in exchange rates. As the majority of the Company's expenditures are in U.S. dollars, the Company has kept a significant portion of its cash in U.S. dollars. The Company has not hedged its exposure to currency fluctuations as the exposure to currency risk is currently insignificant. Interest Rate Risk Interest rate risk arises from interest paid on floating rate debt and interest received on cash and liquid short-term deposits. The Company has not hedged any of its interest rate risk. The Company was exposed to interest rate risk through the following assets and liabilities: December 31, 2020 December 31, Cash and restricted deposits $ 16,530 $ 18,850 Promissory Note $ 16,629 $ 15,501 Based on the above net exposures, as at December 31, 2020, a 1% change in interest rates would have impacted the Company's loss by approximately $0.165 million and carrying value of the promissory note by approximately $0.166 million. Credit Risk Credit risk arises on cash and restricted deposits held with banks and financial institutions, as well as credit exposure on outstanding amounts receivable and other assets. The maximum exposure to credit risk is equal to the carrying value of the financial assets of $19.562 million. The Company's cash and restricted deposits are primarily held through large Canadian and United States financial institutions. Liquidity Risk Liquidity risk is the risk the Company will not be able to meet its financial obligations as they become due and arises through the excess of financial obligations over available financial assets due at any point in time. The Company's objective in managing liquidity risk is to maintain sufficient readily available reserves in order to meet its liquidity requirements at any point in time and is achieved by maintaining sufficient cash. See additional discussion in Note 1. Capital Management The Company's capital management objective is to safeguard the Company's ability to continue as a going concern in order to pursue the development of its mineral property. In the management of capital, the Company includes the components of shareholders' equity, convertible debt and non-convertible debt. The Company manages the capital structure and makes adjustments to it depending on economic conditions and the rate of anticipated expenditures. To maintain or adjust the capital structure, the Company may attempt to issue new shares, issue new debt, acquire or dispose of assets. The Company has no externally imposed capital requirements. In order to assist in management of its capital requirements, the Company prepares budgets that are updated as necessary depending on various factors. The budgets are approved by the Company's Board of Directors. Although the Company expects to have the necessary resources to carry out its plans and operations through December 31, 2021, it does not currently have sufficient capital to complete the development of the Project and generate future profitable operations and is in discussions to arrange sufficient capital to meet these requirements. The Company's objective is to identify the source or sources from which it will obtain the capital required to complete the Project and manage liquidity risk. Further, Glencore has committed to provide financial support to enable the Company to continue its business operations for the next twelve months from the date of the consolidated financial statements (see Note 1).

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2020
Disclosure of non-adjusting events after reporting period [abstract]
Subsequent Events [Text Block]	16. Subsequent Events On February 24, 2021, the Minnesota Supreme Court overturned a decision by the Court of Appeals that had remanded the air permit back to the MPCA. The Supreme Court returned the case to the Court of Appeals to resolve items not specifically addressed in the original decision of the Court of Appeals.

Basis of Preparation (Policies)

Basis of Preparation (Policies)	12 Months Ended
	Dec. 31, 2020
Basis Of Preparation [Abstract]
Statement of Compliance [Policy Text Block]	a) Statement of Compliance The consolidated financial statements have been prepared in accordance with International Financial Reporting Standards ("IFRS") as issued by the International Accounting Standards Board ("IASB"). The financial statements were approved by the Board of Directors on March 18, 2021. Effective August 26, 2020, the Company completed a consolidation of its common shares at a ratio of ten pre-consolidation common shares for one post-consolidation common share. As a result of the consolidation, shares issuable pursuant to the Company's outstanding options, warrants, restricted share units and other convertible securities were proportionally adjusted on the same basis. All common share numbers, numbers of shares issuable under options, warrants and restricted share units and related per share amounts in these consolidated financial statements have been retrospectively adjusted to reflect the share consolidation.
Basis of Consolidation and Preparation [Policy Text Block]	b) Basis of Consolidation and Preparation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. Intercompany balances and transactions have been eliminated on consolidation. The consolidated financial statements have been prepared under the historical cost basis, except for those assets and liabilities that are measured at revalued amounts or fair values at the end of each reporting period. All dollar amounts presented are in United States ("U.S.") dollars unless otherwise specified.
Critical Accounting Estimates [Policy Text Block]	c) Critical Accounting Estimates The preparation of consolidated financial statements in conformity with IFRS requires the use of certain critical accounting estimates. This requires management to make estimates that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as at the date of the financial statements. Critical accounting estimates used in the preparation of the consolidated financial statements are as follows: Determination of mineral reserves Reserves are estimates of the amount of product that can be economically extracted from the Company's property. In order to estimate reserves, estimates are required on a range of geological, technical and economic factors, including quantities, production techniques, production costs, capital costs, transport costs, metal prices and exchange rates. Estimating the quantity of reserves requires the size, shape and depth of deposits to be determined by analyzing geological data. This process may require complex and difficult geological judgments to interpret the data. In addition, management will form a view of forecast prices for its products, based on current and long-term historical average price trends. Changes in the proven and probable reserve estimates may impact the carrying value of property, plant and equipment, rehabilitation provisions, deferred tax amounts and depreciation, depletion and amortization. Provision for Environmental Rehabilitation Costs Provisions for environmental rehabilitation costs associated with mineral property, plant and equipment, are recognized when the Company has a present legal or constructive obligation that can be estimated reliably, and it is probable an outflow of economic benefits will be required to settle the obligation. Provisions are determined by discounting the expected future cash flows at a pre-tax risk-free rate reflecting current market assessments of the time value of money. The provision for environmental rehabilitation obligations represents management's best estimate of the present value of the future cash outflows required to settle the liability. The Company's estimates of its environmental rehabilitation liabilities could be affected by changes in regulations, changes in the extent of environmental rehabilitation required, changes in the means of rehabilitation, changes in the extent of responsibility for the financial liability, changes in operating plans or changes in cost estimates. Operations of the Company may in the future be affected from time to time in varying degrees by changes in environmental regulations, including those for future removal and site restoration costs. The likelihood of new regulations and overall effect upon the Company may vary greatly and are not predictable.
Critical Accounting Judgments [Policy Text Block]	d) Critical Accounting Judgments The preparation of consolidated financial statements in conformity with IFRS requires the use of certain critical accounting judgments. This requires management to make judgments that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as at the date of the financial statements. Critical accounting judgments used in the preparation of the consolidated financial statements are as follows: Impairment of non-financial assets The carrying amounts of non-financial assets, including mineral property, plant and equipment, and intangibles are reviewed at each reporting date, or when events or circumstances indicate the asset may not be recoverable, to determine whether there is any indication of impairment. If any such indication exists, the asset's recoverable amount is estimated at the greater of its value in use and its fair value less costs of disposal ("FVLCD"). In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset. NorthMet meets the criteria of a cash-generating unit as it is the smallest identifiable group of assets that generates cash inflows largely independent of the cash inflows from other assets or groups of assets. An impairment loss is recognized if the carrying amount of an asset exceeds its estimated recoverable amount. An impairment loss previously recorded is reversed if there has been a change in the estimates used to determine the recoverable amount resulting in an increase in the estimated service potential of an asset. The Company considers both external and internal sources of information in assessing whether there are any indications of impairment. External sources of information include changes in the market, economic, and legal environment in which the Company operates and that are not within its control and affect the recoverable amount. Internal sources of information include indications of economic performance of the asset. Going concern assumptions The Company must assess its ability to continue as a going concern and prepare financial statements on a going concern basis unless it either intends to liquidate or cease trading or has no realistic alternative but to do so. In assessing whether the going concern assumption is appropriate, the Company takes into account all available information about the future, which is at least, but is not limited to, twelve months from the end of the reporting period.
Cash and Restricted Deposits [Policy Text Block]	Cash and Restricted Deposits Cash include amounts held in banks and highly liquid investments with original maturities of three months or less. Restricted deposits are held in a trust account and invested in highly liquid investments with a major financial institution as security and collateral primarily for legacy reclamation activities.
Financial Assets [Policy Text Block]	Financial Assets All financial assets are initially recorded at fair value and designated upon inception as one of the following categories: fair value through profit or loss ("FVTPL") or amortized cost. Financial assets classified as FVTPL are measured at fair value with gains and losses recognized through profit and loss. Financial assets classified as amortized cost are measured at amortized cost using the effective interest method less any allowance for impairment. The effective interest method is a method of calculating the amortized cost of a financial asset and allocating interest income over the relevant period. The effective interest rate is the rate that discounts estimated future cash flows through the expected life of the financial asset, or, where appropriate, a shorter period. Loss allowances are recognized for Expected Credit Losses ("ECL") for amounts receivable and other assets not measured at FVTPL. Loss allowances for amounts receivable and other assets are measured at an amount equal to lifetime ECL. ECL is a probability-weighted estimate and measured as the present value of all cash shortfalls including the impact of forward looking information. The loss allowance is presented as a deduction to amounts receivable and other assets. Transaction costs associated with FVTPL financial assets are expensed as incurred, while transaction costs associated with amortized cost financial assets are included in the initial carrying amount of the asset (see Note 15).
Mineral Property [Policy Text Block]	Mineral Property Exploration costs are incurred to discover mineral resources. Evaluation costs are incurred to assess the technical feasibility and commercial viability of the resources found. Exploration and evaluation costs are expensed as incurred. Capitalization of expenditures begins upon receipt and approval of a feasibility study confirming the technical feasibility and commercial viability of extracting the mineral resource ("Definitive Feasibility Study"). Development costs incurred subsequent to a Definitive Feasibility Study and mineral property acquisition costs are capitalized until the property is placed into production, sold, allowed to lapse or abandoned. Development costs are capitalized to the extent they are necessary to bring the property to commercial production and are directly attributable to an area of interest or capable of being reasonably allocated to an area of interest. Upon commencement of production, related mineral property acquisition and development costs will be amortized on a unit of production basis over the estimated proven and probable mineral reserves not to exceed the assets' useful lives.
Plant and Equipment [Policy Text Block]	Plant and Equipment Plant and equipment are recorded at historical cost less accumulated depreciation and if applicable, accumulated impairment losses. Subsequent costs are included in the asset's carrying amount or recognized as a separate asset, as appropriate, if it is probable that the future economic benefits of the expenditure will flow to the Company and its cost can be measured reliably. The carrying amount of a replaced part is derecognized. All other repairs and maintenance are charged to the statement of loss and comprehensive loss during the period in which they are incurred. Depreciation of plant and equipment is calculated using the cost of the asset, less its residual value, over the estimated useful life of the asset on a unit of production or straight-line basis, as appropriate.
Leases [Policy Text Block]	Leases The Company recognizes a right-of-use asset and a lease liability at the lease commencement date. The right-of-use asset is initially measured at cost, which comprises the initial amount of the lease liability, plus any initial direct costs incurred and an estimate of costs to dismantle and remove the underlying asset or to restore the underlying asset or the site on which it is located, less any lease incentives received. The right-of-use asset is subsequently depreciated using the straight-line method from the commencement date to the earlier of the end of the useful life of the right-of-use asset or the end of the lease term. The lease liability is initially measured at the present value of the lease payments, discounted using the incremental borrowing rate.
Intangibles [Policy Text Block]	Intangibles Intangibles include wetland credits and software. Acquisition costs are capitalized until the asset is used, sold, or abandoned. Wetland credits are used to offset and mitigate wetlands disturbed during construction and operation of the Project. As such, costs will be transferred to Mineral Property, Plant and Equipment once placed into service and amortized on a unit of production basis over the estimated proven and probable mineral reserves not to exceed the assets' useful lives. Software is amortized over the useful life once placed into service.
Financial Liabilities [Policy Text Block]	Financial Liabilities All financial liabilities are initially recorded at fair value and designated upon inception as FVTPL or other financial liabilities. Financial liabilities classified as FVTPL are initially recognized at fair value with directly attributable transaction costs expensed as incurred. At the end of each reporting period, financial liabilities at FVTPL are measured at fair value, with changes in fair value recognized directly in profit or loss in the period in which they arise. Financial liabilities classified as other financial liabilities are initially recognized at fair value less directly attributable transaction costs and subsequently measured at amortized cost using the effective interest method which calculates the amortized cost of a financial liability and allocates interest expense over the expected life of the financial liability. Exchanges of instruments and modifications to debt are assessed using quantitative and qualitative factors to consider whether the exchange or modification constitutes an extinguishment of the original financial liability and establishment of a new financial liability. In the case of extinguishment, any fees or costs incurred are recognized in profit or loss in the period in which they arise. Where the terms in an exchange or modification are not assessed to be substantially different, a modification gain or loss is recognized at an amount equal to the difference between the modified cash flows discounted at the original effective interest rate and the carrying value of the debt. The carrying value of the debt is adjusted for this modification gain or loss, directly attributable transaction costs, and any cash paid to or received from the debt holder (see Note 15).
Borrowing costs [Policy Text Block]	Borrowing costs Borrowing costs directly attributable to the acquisition, construction or production of a qualifying asset are capitalized as part of the cost of that asset until such time as the asset is substantially complete and ready for its intended use or sale. Where funds have been borrowed specifically to finance an asset, the amount capitalized is the actual borrowing costs incurred. Where the funds used to finance an asset form part of general borrowings, the amount capitalized is calculated using a weighted average of rates applicable to relevant borrowings of the Company during the period. Other borrowing costs not directly attributable to a qualifying asset are expensed in the year incurred. Classification in the cash flow statement is in accordance with the classification of the underlying asset to which those payments were capitalized.
Share-Based Compensation [Policy Text Block]	Share-Based Compensation All share-based compensation awards made to directors, employees and non-employees are measured and recognized using a fair value based method. For directors and employees, or those providing services similar to employees, the fair value of options is determined using the Black-Scholes pricing model. The fair value of the bonus shares, restricted shares, and restricted share units expected to be settled in shares is amortized over the vesting period. For awards expected to be settled in cash, the change in market value and corresponding liability is adjusted to fair value at each reporting period. The award is accrued and charged over the vesting period either to operations or mineral property, plant and equipment, with the offsetting credit to equity reserves for equity settled awards or liabilities for cash settled awards. If and when share options are ultimately exercised or bonus shares, restricted shares, and restricted share units vest, the applicable amounts are transferred to share capital or removed from liabilities. Certain awards vest upon achievement of non-market performance conditions. On a quarterly basis, management assesses the probability of achieving those performance conditions using the best available information and estimates the appropriate vesting period. When the Company amends the terms of share options, the incremental change in the fair value of the options due to the amendment, as determined using the Black-Scholes pricing model, is recognized over the vesting period in the statement of loss or capitalized as appropriate.
Share Purchase Warrants [Policy Text Block]	Share Purchase Warrants The Company issues share purchase warrants in connection with certain financing transactions. The fair value of the warrants, as determined using the Black-Scholes pricing model or fair value of goods or services received, is credited to equity reserves. The recorded value of share purchase warrants is transferred to share capital upon exercise.
Foreign Currency Translation [Policy Text Block]	Foreign Currency Translation The U.S. dollar is the functional currency of the Company and its wholly-owned subsidiary. Amounts in the consolidated financial statements are expressed in U.S. dollars unless otherwise stated. Transactions in foreign currencies are translated into the functional currency at the exchange rates at the date of the transactions. Monetary assets and liabilities of the Company's operations denominated in a currency other than the U.S. dollar are translated using exchange rates prevailing at the balance sheet date. Revenue and expense items are translated at the exchange rates in effect at the date of the underlying transaction. Exchange differences are recognized in net loss in the year in which they arise.
Loss Per Share [Policy Text Block]	Loss Per Share Loss per share is computed by dividing the loss for the year by the weighted average number of common shares outstanding during the year. Basic and diluted loss per share for each year presented are the same due to the effect of potential issuances of shares under warrant or share option agreements being, in total, anti-dilutive.
Income Taxes and Deferred Taxes [Policy Text Block]	Income Taxes and Deferred Taxes The income tax expense or benefit for the year consists of current and deferred. Current tax is the expected tax payable or receivable on the taxable profit or loss for the year. Current tax is calculated using tax rates and laws that were enacted or substantively enacted at the balance sheet date in each of the jurisdictions and includes any adjustments for taxes payable or recovery in respect of prior periods. Taxable profit or loss differs from profit or loss as reported in the Consolidated Statements of Loss and Comprehensive Loss because of items of income or expense that are taxable or deductible in other years, and items that are never taxable or deductible. Deferred tax is recognized on temporary differences between the carrying amounts of assets and liabilities in the financial statements and the corresponding tax basis used in the computation of taxable profit. Deferred tax liabilities are generally recognized for all taxable temporary differences not eligible for offset. Deferred tax assets are generally recognized for all deductible temporary differences, loss carry forwards and tax credit carry forwards to the extent that it is probable that taxable profits will be available against which they can be utilized. To the extent that the Company does not consider it to be probable that taxable profits will be available against which deductible temporary differences, loss carry forwards, and tax credit carry forwards can be utilized, a deferred tax asset is not recognized.

Mineral Property, Plant and E_2

Mineral Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [abstract]
Disclosure of net book value of mineral property, plant and equipment [Table Text Block]	Net Book Value Mineral Property Plant and Equipment Total Balance at December 31, 2019 $ 409,356 $ 776 $ 410,132 Additions 7,668 255 7,923 Disposals — (9 ) (9 ) Changes to environmental rehabilitation provision (Note 6) (2,315 ) — (2,315 ) Amortization and depreciation — (172 ) (172 ) Balance at December 31, 2020 414,709 850 415,559 Gross carrying value 461,877 2,166 464,043 Accumulated depreciation and impairment $ (47,168 ) $ (1,316 ) $ (48,484 ) Net Book Value Mineral Property Plant and Equipment Total Balance at January 1, 2019 $ 433,347 $ 201 $ 433,548 Additions 33,956 746 34,702 Disposals (867 ) — (867 ) Changes to environmental rehabilitation provision (Note 6) (9,912 ) — (9,912 ) Asset Impairment (47,168 ) — (47,168 ) Amortization and depreciation — (171 ) (171 ) Balance at December 31, 2019 409,356 776 410,132 Gross carrying value 456,524 1,931 458,455 Accumulated depreciation and impairment $ (47,168 ) $ (1,155 ) $ (48,323 )
Disclosure of detailed information about mineral property, plant and equipment [Table Text Block]	Mineral Property December 31, 2020 December 31, Mineral property acquisition and interest costs $ 79,625 $ 79,625 Mine plan and development 52,178 51,388 Environmental 146,094 142,814 Consulting and wages 61,653 58,610 Reclamation and remediation (Note 6) 44,584 46,899 Site activities 30,497 29,942 Mine equipment 78 78 Total $ 414,709 $ 409,356

Intangibles (Tables)

Intangibles (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about intangible assets [abstract]
Disclosure of detailed information about intangible assets [Table Text Block]	Year ended December 31, 2020 2019 Intangibles - beginning of period $ 24,380 $ 24,185 Additions 62 195 Amortization (52 ) — Intangibles - end of period 24,390 24,380 Gross carrying value 24,442 24,380 Accumulated amortization and impairment $ (52 ) $ —

Environmental Rehabilitation _2

Environmental Rehabilitation Provision (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Environmental Rehabilitation Provision [Abstract]
Disclosure of environmental rehabilitation provision [Table Text Block]	Year ended December 31, 2020 2019 Environmental Rehabilitation Provision - beginning of period $ 52,525 $ 61,107 Change in estimate (2,315 ) (9,912 ) Liabilities discharged (543 ) (742 ) Accretion expense 2,083 2,072 Environmental Rehabilitation Provision - end of period 51,750 52,525 Less current portion (893 ) (1,276 ) Non-current portion $ 50,857 $ 51,249

Convertible Debt (Tables)

Convertible Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Convertible Debt [Abstract]
Disclosure of convertible debt [Table Text Block]	Year ended December 31, 2020 2019 Convertible Debt - beginning of period $ — $ 56,984 Fair value of debenture funding 17,912 — Change due to modification — 792 Accretion and capitalized interest 835 2,105 Repayment — (59,881 ) Convertible Debt - end of period $ 18,747 $ —

Non-Convertible Debt and Prom_2

Non-Convertible Debt and Promissory Note (Tables) - Glencore [Member]	12 Months Ended
	Dec. 31, 2020
Non-Convertible Debt [Member]
Disclosure of detailed information about borrowings [line items]
Disclosure of non convertible debt and promissory note [Table Text Block]	Year ended December 31, 2020 2019 Non-Convertible Debt - beginning of period — 178,483 Change due to modification (Note 7) — (352 ) Accretion and capitalized interest — 12,305 Repayment — (190,436 ) Non-Convertible Debt - end of period — —
Promissory Note [Member]
Disclosure of detailed information about borrowings [line items]
Disclosure of non convertible debt and promissory note [Table Text Block]	Year ended December 31, 2020 2019 Promissory Note - beginning of period $ 15,501 $ — Funding, net of costs — 15,000 Accretion and capitalized interest 1,128 501 Promissory Note - end of period $ 16,629 $ 15,501

Share Capital (Tables)

Share Capital (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Classes Of Share Capital Line Items
Disclosure of stock options activities [Table Text Block]	Year ended December 31, 2020 2019 Number of Options Weighted Average Exercise Price Number of Options Weighted Average Exercise Price Outstanding - beginning of period 2,406,600 $ 7.68 2,269,200 $ 9.11 Granted 25,000 3.90 362,500 8.10 Exercised — — (62,500 ) 7.11 Expired (136,400 ) 9.84 (162,600 ) 10.09 Anti-dilution adjustment — — — (1.21 ) Outstanding - end of period 2,295,200 $ 7.51 2,406,600 $ 7.68
Disclosure of stock options outstanding and exercisable [Table Text Block]	Range of Exercise Prices Number of options outstanding Number of options exercisable Weighted Average Exercise Price Weighted Average Remaining Life 3.90 to 7.00 1,048,500 1,048,500 $ 6.27 1.44 7.01 to 8.70 966,700 896,800 7.68 2.79 8.71 to 13.00 175,000 175,000 9.21 2.38 13.01 to 16.30 105,000 105,000 15.61 0.15 2,295,200 2,225,300 $ 7.51 2.02
Disclosure of fair value of options granted using black-scholes option pricing model [Table Text Block]	Year ended December 31, 2020 2019 Risk-free interest rate 0.33% 2.52% Expected dividend yield — — Expected forfeiture rate — — Expected volatility 71.88% 54.56% Expected life in years 5.00 2.50 Weighted average fair value of each option $ 2.27 $ 2.87
Disclosure of bonus shares [Table Text Block]	Year ended December 31, 2020 2019 Allocated Authorized & Unissued Allocated Authorized & Unissued Outstanding - beginning of period 270,000 364,000 270,000 364,000 Outstanding - end of period 270,000 364,000 270,000 364,000
Restricted Share Unit (RSU) [Member]
Disclosure Of Classes Of Share Capital Line Items
Disclosure of stock options activities [Table Text Block]	Year ended December 31, 2020 2019 Outstanding - beginning of period 464,886 334,791 Granted 918,252 172,587 Vested (221,979 ) (104,937 ) Forfeited (10,099 ) — Anti-dilution adjustment — 62,445 Rounding due to share consolidation (25 ) — Outstanding - end of period 1,151,035 464,886
Warrants [Member]
Disclosure Of Classes Of Share Capital Line Items
Disclosure of stock options activities [Table Text Block]	Year ended December 31, 2020 2019 Number of Purchase Warrants Weighted Average Exercise P rice Number of Purchase Warrants Weighted Average Exercise Price Outstanding - beginning of period 3,137,918 $ 8.04 2,718,971 $ 9.49 Granted — — 645,800 7.37 Expired — — (645,800 ) 8.23 Anti-dilution adjustment — — 418,947 (1.20 ) Outstanding - end of period 3,137,918 $ 8.04 3,137,918 $ 8.04
Disclosure of fair value of options granted using black-scholes option pricing model [Table Text Block]	Year ended December 31, 2020 2019 Risk-free interest rate — 2.18% Expected dividend yield — — Expected forfeiture rate — — Expected volatility — 52.59% Expected life in years — 3.00 Weighted average fair value of each warrant $ — $ 2.42

Finance Costs - Net (Tables)

Finance Costs - Net (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Finance Costs Net [Abstract]
Disclosure of finance costs net [Table Text Block]	Year ended December 31, 2020 2019 Debt accretion and capitalized interest: Promissory note (Note 9) $ 1,128 $ 501 Convertible debt (Note 8) 835 2,105 Non-convertible debt (Note 9) — 12,305 Less: amounts capitalized on qualifying assets — (14,751 ) Environmental rehabilitation accretion (Note 6) 2,083 2,072 Restricted deposit income (1,527 ) (1,163 ) Cash interest income (23 ) (218 ) Other finance (income) costs (1,452 ) 681 Finance costs - net $ 1,044 $ 1,532

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2020
Related party transactions [abstract]
Disclosure of key management personnel compensation [Table Text Block]	Year ended December 31, 2020 2019 Salaries and other short-term benefits $ 2,351 $ 2,247 Other long-term benefits 59 47 Share-based payment (1) 1,781 1,917 Total $ 4,191 $ 4,211 (1)

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Major components of tax expense (income) [abstract]
Disclosure of detailed information about of reconciliation of effective income tax rate [Table Text Block]	Year ended December 31, 2020 2019 Loss for the year before taxes $ (20,830 ) $ (57,903 ) Combined statutory tax rate 27.0% 27.0% Expected tax recovery (5,624 ) (15,634 ) Difference in foreign tax rates (303 ) (914 ) Non-deductible items — 541 Change in unrecognized deferred tax and other items 5,927 16,007 Income Tax Expense / (Recovery) $ — $ —
Disclosure of components of deferred tax assets [Table Text Block]	Year ended December 31, 2020 2019 Non-capital loss carry forward assets $ 17,738 $ 16,994 Mineral property acquisition, exploration and development costs (17,738 ) (16,994 ) Net deferred income tax liabilities $ — $ —
Disclosure of detailed information about unrecognized deductible temporary differences and unused tax losses [Table Text Block]	Year ended December 31, 2020 2019 Non-capital loss carry forward assets $ 46,414 $ 41,104 Capital loss carry forward assets 360 360 Intercompany receivable assets 2,690 2,690 Other assets 4,186 4,288 Unrecognized deferred income tax assets $ 53,650 $ 48,442

Commitments And Contingencies (

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure Of Commitments And Contingencies [Abstract]
Disclosure of contractual obligations [Table Text Block]	Contractual Obligations Carrying Value Contractual Cash flows Less than 1 year 1 - 3 years 3 - 5 years More than 5 years Accounts payable and accruals $ 3,392 $ 3,392 $ 2,755 $ 637 $ — $ — Lease liability 557 659 145 297 217 — Promissory note (Note 9) 16,629 16,919 16,919 — — — Convertible debt (Note 8) 18,747 24,056 — 24,056 — — Firm commitments — 436 64 284 88 — Total $ 39,325 $ 45,462 $ 19,883 $ 25,274 $ 305 $ —

Financial Instruments and Ris_2

Financial Instruments and Risk Management (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about financial instruments [abstract]
Disclosure of detailed information about financial instruments [Table Text Block]	The carrying values of each classification of financial instrument as at December 31, 2020 are: Amortized Cost Fair value through profit or loss Total carrying value Financial assets Cash $ 3,554 $ — $ 3,554 Restricted deposits 575 12,401 12,976 Amounts receivable and other assets 650 2,382 3,032 Total financial assets 4,779 14,783 19,562 Financial liabilities Accounts payable and accruals 2,620 772 3,392 Convertible debt 18,747 — 18,747 Promissory note 16,629 — 16,629 Lease liabilities 557 — 557 Total financial liabilities $ 38,553 $ 772 $ 39,325 The carrying values of each classification of financial instrument as at December 31, 2019 are: Amortized Fair value through Total carrying value Financial assets Cash $ 7,401 $ — $ 7,401 Restricted deposits 809 10,640 11,449 Amounts receivable and other assets 738 2,176 2,914 Total financial assets 8,948 12,816 21,764 Accounts payable and accruals 4,408 125 4,533 Promissory note 15,501 — 15,501 Lease liabilities 616 — 616 Total financial liabilities $ 20,525 $ 125 $ 20,650
Disclosure of financial instruments by type of interest rate [Table Text Block]	December 31, 2020 December 31, Cash and restricted deposits $ 16,530 $ 18,850 Promissory Note $ 16,629 $ 15,501

Nature of Business and Liquid_2

Nature of Business and Liquidity (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Jan. 28, 2021	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Cash	$ 3,554		$ 7,401
Working capital deficiency	$ 15,241
Poly Met Mining, Inc [Member]
Disclosure of detailed information about borrowings [line items]
Percentage of ownership interest in subsidiary	100.00%
Glencore [Member]
Disclosure of detailed information about borrowings [line items]
Percentage of ownership	71.50%
Glencore [Member] | Events after reporting period [Member]
Disclosure of detailed information about borrowings [line items]
Unsecured convertible debentures		$ 7,000
Glencore [Member] | Convertible Debt [Member] | Bottom of range [Member]
Disclosure of detailed information about borrowings [line items]
Unsecured convertible debentures	$ 20,000
Glencore [Member] | Convertible Debt [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [line items]
Unsecured convertible debentures	30,000
Glencore [Member] | Unsecured Convertible Debentures [Member]
Disclosure of detailed information about borrowings [line items]
Unsecured convertible debentures	$ 23,000

Mineral Property Agreements (Na

Mineral Property Agreements (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
RGGS Land & Minerals Ltd., L.P. [Member]
Disclosure of acquired receivables [line items]
Annual lease payments	$ 175
Lease annual payment date	January 2022
Recovery of advance royalty payments	$ 3,370
LMC Minerals [Member]
Disclosure of acquired receivables [line items]
Annual lease payments	$ 30
Lease annual payment date	November 2021
Recovery of advance royalty payments	$ 279
Bottom of range [Member]
Disclosure of acquired receivables [line items]
Percentage of future production royalties payable	3.00%
Top of range [Member]
Disclosure of acquired receivables [line items]
Percentage of future production royalties payable	5.00%

Mineral Property, Plant and E_3

Mineral Property, Plant and Equipment (Narrative) (Details) - Erie Plant, processing facility from Cliffs [Member] $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2006USD ($)a	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Disclosure of detailed information about property, plant and equipment [line items]
Additional area of land used for tailings storage facilities | a	6,000
Consideration paid for processing facility and associated infrastructure	$ 18,900
Fair market value of shares	$ 13,953
Capitalized development costs		$ 7,668	$ 19,205
Borrowing costs capitalized		$ 0	$ 14,751

Mineral Property, Plant and E_4

Mineral Property, Plant and Equipment - Disclosure of net book value of mineral property, plant and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]
Beginning Balance	$ 410,132	$ 433,548
Additions	7,923	34,702
Disposals	(9)	(867)
Changes to environmental rehabilitation provision	(2,315)	(9,912)
Asset Impairment		(47,168)
Amortization and Depreciation	(172)	(171)
Ending Balance	415,559	410,132
Gross carrying value [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning Balance	458,455
Ending Balance	464,043	458,455
Accumulated depreciation and impairment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning Balance	(48,323)
Ending Balance	(48,484)	(48,323)
Mineral Property [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning Balance	409,356	433,347
Additions	7,668	33,956
Disposals	0	(867)
Changes to environmental rehabilitation provision	(2,315)	(9,912)
Asset Impairment		(47,168)
Amortization and Depreciation	0	0
Ending Balance	414,709	409,356
Mineral Property [Member] | Gross carrying value [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning Balance	456,524
Ending Balance	461,877	456,524
Mineral Property [Member] | Accumulated depreciation and impairment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning Balance	(47,168)
Ending Balance	(47,168)	(47,168)
Plant and Equipment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning Balance	776	201
Additions	255	746
Disposals	(9)	0
Changes to environmental rehabilitation provision	0	0
Asset Impairment		0
Amortization and Depreciation	(172)	(171)
Ending Balance	850	776
Plant and Equipment [Member] | Gross carrying value [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning Balance	1,931
Ending Balance	2,166	1,931
Plant and Equipment [Member] | Accumulated depreciation and impairment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning Balance	(1,155)
Ending Balance	$ (1,316)	$ (1,155)

Mineral Property, Plant and E_5

Mineral Property, Plant and Equipment - Disclosure of detailed information about mineral property (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]
Total	$ 415,559	$ 410,132	$ 433,548
Mineral Property [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Mineral property acquisition and interest costs	79,625	79,625
Mine plan and development	52,178	51,388
Environmental	146,094	142,814
Consulting and wages	61,653	58,610
Reclamation and remediation	44,584	46,899
Site activities	30,497	29,942
Mine equipment	78	78
Total	$ 414,709	$ 409,356	$ 433,347

Intangibles (Narrative) (Detail

Intangibles (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]
Intangible assets		$ 24,390	$ 24,380	$ 24,185
Wetland mitigation bank credits [Member] | EIP Credit Co., LLC [Member]
Disclosure of detailed information about intangible assets [line items]
Minimum term specified to use credits for project	5 years
Annual option payments	$ 250
Intangible assets		24,185	24,185
Software [Member]
Disclosure of detailed information about intangible assets [line items]
Software costs capitalized		62	195
Intangible assets		$ 205	$ 195

Intangibles - Disclosure of Int

Intangibles - Disclosure of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]
Intangibles - beginning of period	$ 24,380	$ 24,185
Additions	62	195
Amortization	(52)	0
Intangibles - end of period	24,390	24,380
Gross carrying value [Member]
Disclosure of detailed information about intangible assets [line items]
Intangibles - beginning of period	24,380
Intangibles - end of period	24,442	24,380
Accumulated amortization and impairment [Member]
Disclosure of detailed information about intangible assets [line items]
Intangibles - beginning of period	0
Intangibles - end of period	$ (52)	$ 0

Environmental Rehabilitation _3

Environmental Rehabilitation Provision (Narrative) (Details) - USD ($) $ in Thousands	Nov. 01, 2018	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Detailed Information About Environmental Rehabilitation Provision [Line Items]
Estimated environmental rehabilitation provision		$ 51,750	$ 52,525
Estimated cash flows at present day cost		$ 67,597	$ 70,480
Projected inflation rate		2.00%	2.20%
Market risk-free interest rate		3.70%	4.00%
Change in estimated decrease in Environmental Rehabilitation Provision			$ 9,900
Estimated liability Increase if 1% lower discount rate		$ 8,200
Estimated liability decrease if 1% higher discount rate		6,600
Cash and restricted cash deposits	$ 10,000	12,976	11,449
Letter of credit	65,000
Trust fund balance		$ 12,725	$ 11,198
Acquisition Agreement [Member]
Disclosure Of Detailed Information About Environmental Rehabilitation Provision [Line Items]
Letter of credit	13,400
Future contribution to trust fund through 1 to 8 mine year	$ 2,000

Environmental Rehabilitation _4

Environmental Rehabilitation Provision - Disclosure of Environmental Rehabilitation Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Environmental Rehabilitation Provision [Abstract]
Environmental Rehabilitation Provision - beginning of period	$ 52,525	$ 61,107
Change in estimate	(2,315)	(9,912)
Liabilities discharged	(543)	(742)
Accretion expense	2,083	2,072
Environmental Rehabilitation Provision - end of period	51,750	52,525
Less current portion	(893)	(1,276)
Non-current portion	$ 50,857	$ 51,249

Glencore Financing (Narrative)

Glencore Financing (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended	132 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of transactions between related parties [line items]
Principal amount of debt instrument	$ 16,629	$ 15,501
Glencore [Member]
Disclosure of transactions between related parties [line items]
Number of common stock acquired		72,008,404
Percentage of shares acquired		71.50%
Unsecured Convertible Debentures [Member] | Glencore [Member]
Disclosure of transactions between related parties [line items]
Unsecured convertible debentures	$ 23,000
Maturity date of debt instrument	March 31, 2023
Promissory Note [Member] | Glencore [Member]
Disclosure of transactions between related parties [line items]
Principal amount of debt instrument	$ 15,000
Maturity date of debt instrument	December 31, 2021

Convertible Debt (Narrative) (D

Convertible Debt (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Mar. 17, 2020	Mar. 22, 2019	Dec. 31, 2020	Dec. 31, 2019	Jan. 28, 2021	Sep. 30, 2020	Jun. 23, 2020	Mar. 18, 2020	Dec. 31, 2009
Disclosure of detailed information about borrowings [line items]
Loss on debenture modification				$ 2,004
Glencore [Member] | Convertible Debt [Member]
Disclosure of detailed information about borrowings [line items]
Principal secured debentures amount									$ 25,000
Number of warrants issued		6,458,001
Warrants expiration date		Mar. 31, 2024
Warrants exercise price		$ 0.7368
Loss on debenture modification		$ 2,014
Effective interest rate	4.00%
Interest costs capitalized			$ 34,881
Borrowing costs capitalised				$ 2,105
Project financing threshold amount	$ 100,000
Conversion price	$ 2.223
Unsecured convertible debentures issued					$ 7,000	$ 9,000	$ 7,000	$ 7,000
Transaction costs for financing			112
Fair value of debt components issued			17,912
Residual amount allocated to equity			$ 4,976
Glencore [Member] | Convertible Debt [Member] | Condition one [Member]
Disclosure of detailed information about borrowings [line items]
Increase in convertible debt		$ 810
Effective interest rate		7.30%
Glencore [Member] | Convertible Debt [Member] | Condition two [Member]
Disclosure of detailed information about borrowings [line items]
Decrease in non-convertible debt		$ 360
Effective interest rate		14.30%
Glencore [Member] | Convertible Debt [Member] | Condition three [Member]
Disclosure of detailed information about borrowings [line items]
Fair value of purchase warrants issued		$ 1,564
Bottom of range [Member] | Glencore [Member] | Convertible Debt [Member]
Disclosure of detailed information about borrowings [line items]
Unsecured convertible debentures	$ 20,000
Top of range [Member] | Glencore [Member] | Convertible Debt [Member]
Disclosure of detailed information about borrowings [line items]
Unsecured convertible debentures	$ 30,000

Convertible Debt - Disclosure o

Convertible Debt - Disclosure of Convertible Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Convertible Debt - beginning of period	$ 0
Convertible Debt - end of period	18,747	$ 0
Glencore [Member] | Convertible Debt [Member]
Disclosure of detailed information about borrowings [line items]
Convertible Debt - beginning of period	0	56,984
Fair value of debenture funding	17,912	0
Change due to modification	0	792
Accretion and capitalized interest	835	2,105
Repayment	0	(59,881)
Convertible Debt - end of period	$ 18,747	$ 0

Non-Convertible Debt and Prom_3

Non-Convertible Debt and Promissory Note (Narrative) (Details) - Glencore [Member] - USD ($) $ in Thousands	Aug. 07, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2015
Non-Convertible Debt [Member]
Disclosure of detailed information about borrowings [line items]
Principal secured debentures amount				$ 140,000
Interest costs capitalized		$ 50,436
Borrowing costs capitalised			$ 12,305
Promissory Note [Member]
Disclosure of detailed information about borrowings [line items]
Principal secured debentures amount	$ 15,000
Borrowings, interest rate basis	LIBOR plus 6.0%
Availability of debt or equity financing	$ 100,000
Interest costs capitalized		$ 1,629
Borrowing costs capitalised			$ 341

Non-Convertible Debt and Prom_4

Non-Convertible Debt and Promissory Note - Disclosure of Non-Convertible Debt and Promissory Note (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Beginning of period	$ 15,501
End of period	16,629	$ 15,501
Glencore [Member] | Non-Convertible Debt [Member]
Disclosure of detailed information about borrowings [line items]
Beginning of period	0	178,483
Change due to modification	0	(352)
Accretion and capitalized interest	0	12,305
Repayment	0	(190,436)
End of period	0	0
Glencore [Member] | Promissory Note [Member]
Disclosure of detailed information about borrowings [line items]
Beginning of period	15,501	0
Funding, net of costs	0	15,000
Accretion and capitalized interest	1,128	501
End of period	$ 16,629	$ 15,501

Share Capital (Narrative) (Deta

Share Capital (Narrative) (Details)	Jun. 03, 2019$ / sharesshares	Jun. 28, 2019USD ($)shares	May 24, 2019USD ($)	Dec. 31, 2020USD ($)ShareYearshares	Dec. 31, 2019USD ($)Shareshares	Dec. 31, 2018ShareUSD ($)	Jun. 27, 2007shares
Disclosure Of Classes Of Share Capital Line Items
Maximum proceeds authorized under prospectus			$ 265,000,000
Number of shares issued | shares		682,813,838
Proceeds from common share		$ 265,000,000
Expense and fees related to Rights Offering		$ 11,953,000
Payment of land purchase options					$ 46,000
Share-based compensation				$ 1,842,000	1,558,000
Expense from share-based payment transactions				1,842,000	1,558,000
Share capital				$ 527,908,000	$ 526,884,000
Number of share options granted | Share				25,000	362,500
Fair value of options				$ 57,000	$ 1,042,000
Number of outstanding share options not yet vested and exercisable | Share				69,900
Remaining life of outstanding share options				2 years 7 days
Number of shares authorised for bonus shares | shares				364,000
Glencore [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of shares issued | shares		430,521,941
Percentage of shares owned		71.60%
Commitment fee		$ 7,690,000
Repayment of convertible debt		59,881,000
Repayment of non-convertible debt		190,436,000
Settlement of offering subscription amount from debt		$ 243,435,000
Rights Offering [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of shares issued | shares	2.119069
Price per share | $ / shares	$ 0.3881
Rights Offering [Member] | Glencore [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of shares issued | shares		196,726,042
Exercise of Share Options [Member]
Disclosure Of Classes Of Share Capital Line Items
Proceeds from exercise of options					$ 274,000
Number of shares issued | shares					40,017
Land Purchase Options [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of shares issued | shares					7,875
Payment of land purchase options					$ 46,000
Omnibus Plan [Member]
Disclosure Of Classes Of Share Capital Line Items
Options pursuant to an exemption | shares							250,000
Share-based compensation				2,193,000	2,055,000
Expense from share-based payment transactions				1,842,000	1,558,000
Share-based compensation capitalized to mineral property, plant and equipment				351,000	497,000
Capital reserve				1,203,000	1,986,000
Share capital				150,000	84,000
Additional paid-in capital				840,000	15,000
Exercise of options and warrants and vesting of restricted share units transferred from equity reserves to share capital.				874,000	1,013,000
Share Options [Member]
Disclosure Of Classes Of Share Capital Line Items
Share-based compensation				$ 159,000	1,171,000
Share Options [Member] | Bottom of range [Member]
Disclosure Of Classes Of Share Capital Line Items
Remaining life of outstanding share options				25 days
Share Options [Member] | Top of range [Member]
Disclosure Of Classes Of Share Capital Line Items
Remaining life of outstanding share options				9 years 5 months 26 days
Restricted Share Unit (RSU) [Member]
Disclosure Of Classes Of Share Capital Line Items
Share-based compensation				$ 1,884,000	$ 800,000
Number of other equity instruments outstanding | Share				1,151,035	464,886	334,791
Number of other equity instruments exercised or vested in share-based payment arrangement | Share				60,196
Number of share units expected to be settled in cash | shares				418,187
Number of other equity instruments granted in share-based payment arrangement | Share				918,252	172,587
Weighted average fair value at measurement date, other equity instruments granted				$ 2,389,000	$ 1,355,000
Number of restricted shares settled | shares					9,550
Number of restricted shares settled upon vesting in restricted shares unit | shares				153,304	64,451
Number of share units settled upon vesting options | shares				68,675	30,936
Proceeds cash from vesting options				$ 204,000	$ 232,000
Restricted Share Unit (RSU) [Member] | Construction Finance [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of other equity instruments outstanding | Share				86,557
Restricted Share Unit (RSU) [Member] | Production [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of other equity instruments outstanding | Share				45,261
Restricted Share Unit (RSU) [Member] | January 2021 [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of other equity instruments outstanding | Share				152,312
Restricted Share Unit (RSU) [Member] | January 2022 [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of other equity instruments outstanding | Share				800,459
Restricted Share Unit (RSU) [Member] | Other [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of other equity instruments outstanding | Share				6,250
Unrestricted Shares [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of shares issued | shares				57,481	10,292
Share-based compensation				$ 150,000	$ 84,000
Warrant [Member]
Disclosure Of Classes Of Share Capital Line Items
Number of other equity instruments outstanding				3,137,918	3,137,918	2,718,971
Number of other equity instruments granted in share-based payment arrangement				0	645,800
Weighted average fair value at measurement date, other equity instruments granted				$ 0	$ 2.42
Warrant [Member] | Bottom of range [Member]
Disclosure Of Classes Of Share Capital Line Items
Expiry period of outstanding share purchase warrants | Year				0.80
Warrant [Member] | Top of range [Member]
Disclosure Of Classes Of Share Capital Line Items
Expiry period of outstanding share purchase warrants | Year				3.25

Share Capital - Disclosure of S

Share Capital - Disclosure of Stock Options Activities (Details)	12 Months Ended
	Dec. 31, 2020Share$ / shares	Dec. 31, 2019Share$ / shares
Disclosure of classes of share capital [abstract]
Outstanding - beginning of period | Share	2,406,600	2,269,200
Weighted average exercise price - beginning of period	$ 7.68	$ 9.11
Granted | Share	25,000	362,500
Granted	$ 3.90	$ 8.10
Exercised | Share	0	(62,500)
Exercised	$ 0	$ 7.11
Expired | Share	(136,400)	(162,600)
Expired	$ 9.84	$ 10.09
Anti-dilution price adjustment		$ (1.21)
Outstanding - end of period | Share	2,295,200	2,406,600
Weighted average exercise price - end of period	$ 7.51	$ 7.68

Share Capital - Disclosure of_2

Share Capital - Disclosure of Stock Options Outstanding and Exercisable (Details)	12 Months Ended
	Dec. 31, 2020Share$ / shares	Dec. 31, 2019Share$ / shares	Dec. 31, 2018Share$ / shares
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Number of options outstanding | Share	2,295,200	2,406,600	2,269,200
Number of options exercisable | Share	2,225,300
Weighted Average Exercise Price	$ 7.51	$ 7.68	$ 9.11
Weighted Average Remaining Life	2 years 7 days
3.90 to 7.00 [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Number of options outstanding | Share	1,048,500
Number of options exercisable | Share	1,048,500
Weighted Average Exercise Price	$ 6.27
Weighted Average Remaining Life	1 year 5 months 8 days
3.90 to 7.00 [Member] | Bottom of range [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Weighted Average Exercise Price	$ 3.90
3.90 to 7.00 [Member] | Top of range [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Weighted Average Exercise Price	$ 7
7.01 to 8.70 [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Number of options outstanding | Share	966,700
Number of options exercisable | Share	896,800
Weighted Average Exercise Price	$ 7.68
Weighted Average Remaining Life	2 years 9 months 14 days
7.01 to 8.70 [Member] | Bottom of range [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Weighted Average Exercise Price	$ 7.01
7.01 to 8.70 [Member] | Top of range [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Weighted Average Exercise Price	$ 8.70
8.71 to 13.00 [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Number of options outstanding | Share	175,000
Number of options exercisable | Share	175,000
Weighted Average Exercise Price	$ 9.21
Weighted Average Remaining Life	2 years 4 months 17 days
8.71 to 13.00 [Member] | Bottom of range [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Weighted Average Exercise Price	$ 8.71
8.71 to 13.00 [Member] | Top of range [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Weighted Average Exercise Price	$ 13
13.01 to 16.30 [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Number of options outstanding | Share	105,000
Number of options exercisable | Share	105,000
Weighted Average Exercise Price	$ 15.61
Weighted Average Remaining Life	1 month 24 days
13.01 to 16.30 [Member] | Bottom of range [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Weighted Average Exercise Price	$ 13.01
13.01 to 16.30 [Member] | Top of range [Member]
Disclosure Of Number And Weighted Average Remaining Contractual Life Of Outstanding Share Options Line Items
Weighted Average Exercise Price	$ 16.30

Share Capital - Disclosure of F

Share Capital - Disclosure of Fair Value of Options Granted Using Black-Scholes Option Pricing Model (Details)	12 Months Ended
	Dec. 31, 2020Year$ / shares	Dec. 31, 2019Year$ / shares
Disclosure of classes of share capital [abstract]
Risk-free interest rate	0.33%	2.52%
Expected dividend yield	0.00%	0.00%
Expected forfeiture rate	0.00%	0.00%
Expected volatility	71.88%	54.56%
Expected life in years | Year	5	2.50
Weighted average fair value of each option | $ / shares	$ 2.27	$ 2.87

Share Capital - Disclosure of R

Share Capital - Disclosure of Restricted Shares and Share Purchase Warrant Activities (Details)	12 Months Ended
	Dec. 31, 2020ShareUSD ($)$ / sharesshares	Dec. 31, 2019ShareUSD ($)$ / sharesshares
Restricted Share Unit [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding - beginning of period	464,886	334,791
Granted	918,252	172,587
Vested	(221,979)	(104,937)
Forfeited	(10,099)	0
Anti-dilution adjustment	0	62,445
Rounding due to share consolidation | shares	(25)	0
Outstanding - end of period	1,151,035	464,886
Warrants [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding - beginning of period | $	3,137,918	2,718,971
Granted | $	0	645,800
Expired | $	0	(645,800)
Anti-dilution adjustment | $		418,947
Outstanding - end of period | $	3,137,918	3,137,918
Weighted average exercise price outstanding - beginning of period | $ / shares	$ 8.04	$ 9.49
Granted | $ / shares	0	7.37
Expired | $ / shares	0	8.23
Anti-dilution adjustment | $ / shares		(1.20)
Weighted average exercise price outstanding - end of period | $ / shares	$ 8.04	$ 8.04

Share Capital - Disclosure of B

Share Capital - Disclosure of Bonus Shares (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Allocated Bonus Shares [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding share authorized, beginning of period	270,000	270,000
Outstanding share authorized, end of period	270,000	270,000
Unissued Bonus Shares [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding share authorized, beginning of period	364,000	364,000
Outstanding share authorized, end of period	364,000	364,000

Share Capital - Disclosure of_3

Share Capital - Disclosure of Share Purchase Warrants Granted Using Black-Scholes Option Pricing Model (Details) - Warrant [Member]	12 Months Ended
	Dec. 31, 2020USD ($)Year	Dec. 31, 2019USD ($)Year
Disclosure of terms and conditions of share-based payment arrangement [line items]
Risk-free interest rate	0.00%	2.18%
Expected dividend yield	0.00%	0.00%
Expected forfeiture rate	0.00%	0.00%
Expected volatility	0.00%	52.59%
Expected life in years | Year	0	3
Weighted average fair value of each warrant | $	$ 0	$ 2.42

Finance Costs - Net - Disclosur

Finance Costs - Net - Disclosure of Finance Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt accretion and capitalized interest:
Promissory note	$ 1,128	$ 501
Convertible debt	835	2,105
Non-convertible debt	0	12,305
Less: amounts capitalized on qualifying assets	0	(14,751)
Environmental rehabilitation accretion	2,083	2,072
Restricted deposits	(1,527)	(1,163)
Cash interest income	(23)	(218)
Other finance (income) costs	(1,452)	681
Finance costs - net	$ 1,044	$ 1,532

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Glencore [Member]
Disclosure of transactions between related parties [line items]
Percentage of ownership related party	71.50%
Technical Services Agreement [Member]
Disclosure of transactions between related parties [line items]
Services received	$ 309	$ 474

Related Party Transactions - Di

Related Party Transactions - Disclosure of Key Management Personnel Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Related party transactions [abstract]
Salaries and other short-term benefits	$ 2,351	$ 2,247
Other long-term benefits	59	47
Share-based payment	1,781	1,917
Total	$ 4,191	$ 4,211

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Canadian [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital loss carry forwards	$ 60.1	$ 53.8
Description of expiration date	expire between 2026 and 2040
US federal [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital loss carry forwards	$ 167.5	$ 152.3
Description of expiration date	expire between 2021 and 2035
US federal [Member] | Prior to 2018 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital loss carry forwards	$ 134.2
Description of expiration date	expire between 2021 and 2037
US federal [Member] | Tax years since 2018 [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Non-capital loss carry forwards	$ 33.3
Description of expiration date	do not expire

Income Taxes - Disclosure of Ef

Income Taxes - Disclosure of Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Major components of tax expense (income) [abstract]
Loss for the year before taxes	$ (20,830)	$ (57,903)
Combined statutory tax rate	27.00%	27.00%
Expected tax recovery	$ (5,624)	$ (15,634)
Difference in foreign tax rates	(303)	(914)
Non-deductible items	0	541
Change in unrecognized deferred tax and other items	5,927	16,007
Income Tax Expense / (Recovery)	$ 0	$ 0

Income Taxes - Disclosure of De

Income Taxes - Disclosure of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred income tax liabilities	$ 0	$ 0
Non-capital loss carry forward assets [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred income tax liabilities	17,738	16,994
Mineral property acquisition, exploration and development costs [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred income tax liabilities	$ (17,738)	$ (16,994)

Income Taxes - Disclosure of Un

Income Taxes - Disclosure of Unrecognized Deferred Income Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred income tax assets	$ 53,650	$ 48,442
Non-capital loss carry forward assets [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred income tax assets	46,414	41,104
Capital loss carry forward assets [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred income tax assets	360	360
Intercompany receivable assets [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred income tax assets	2,690	2,690
Other assets [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred income tax assets	$ 4,186	$ 4,288

Commitments And Contingencies -

Commitments And Contingencies - Disclosure of Contractual Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis of operating lease payments [line items]
Accounts payable and accruals	$ 2,755	$ 4,533
Lease liability	557	616
Promissory note	16,629
Convertible debt	18,747	0
Total	39,325	$ 20,650
Carrying Value [Member]
Disclosure of maturity analysis of operating lease payments [line items]
Accounts payable and accruals	3,392
Lease liability	557
Promissory note	16,629
Convertible debt	18,747
Firm commitments	0
Total	39,325
Contractual Cash Flow [Member]
Disclosure of maturity analysis of operating lease payments [line items]
Accounts payable and accruals	3,392
Lease liability	659
Promissory note	16,919
Convertible debt	24,056
Firm commitments	436
Total	45,462
Less than 1 year [Member]
Disclosure of maturity analysis of operating lease payments [line items]
Accounts payable and accruals	2,755
Lease liability	145
Promissory note	16,919
Convertible debt	0
Firm commitments	64
Total	19,883
1 - 3 years [Member]
Disclosure of maturity analysis of operating lease payments [line items]
Accounts payable and accruals	637
Lease liability	297
Promissory note	0
Convertible debt	24,056
Firm commitments	284
Total	25,274
3 - 5 year [Member]
Disclosure of maturity analysis of operating lease payments [line items]
Accounts payable and accruals	0
Lease liability	217
Promissory note	0
Convertible debt	0
Firm commitments	88
Total	305
More than 5 years [Member]
Disclosure of maturity analysis of operating lease payments [line items]
Accounts payable and accruals	0
Lease liability	0
Promissory note	0
Convertible debt	0
Firm commitments	0
Total	$ 0

Financial Instruments and Ris_3

Financial Instruments and Risk Management (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Nov. 01, 2018
Disclosure of detailed information about financial instruments [line items]
Impact on loss due to percent change in interest rate	$ 165
Impact on carrying value of promissory note due to percent change in interest rate	166
Restricted deposits	12,976	$ 11,449	$ 10,000
Amounts receivable and other assets	3,032	2,914
Current trade payables	2,755	4,533
Maximum exposure to credit risk	19,562
Financial instrument at fair value through profit or loss [Member]
Disclosure of detailed information about financial instruments [line items]
Restricted deposits	12,401	10,640
Amounts receivable and other assets	2,382	2,176
Financial instrument at fair value through profit or loss [Member] | Level 1 inputs [Member]
Disclosure of detailed information about financial instruments [line items]
Restricted deposits	12,401	10,640
Financial instrument at fair value through profit or loss [Member] | Level 2 inputs [Member]
Disclosure of detailed information about financial instruments [line items]
Current trade payables	772	125
Financial instrument at fair value through profit or loss [Member] | Level 3 inputs [Member]
Disclosure of detailed information about financial instruments [line items]
Amounts receivable and other assets	$ 2,382	$ 2,176

Financial Instruments and Ris_4

Financial Instruments and Risk Management - Disclosure of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Nov. 01, 2018
Financial assets
Cash	$ 3,554	$ 7,401
Restricted deposits	12,976	11,449	$ 10,000
Amounts receivable and other assets	3,032	2,914
Total financial assets	19,562	21,764
Financial liabilities
Accounts payable and accruals	3,392	4,533
Convertible debt	18,747	0
Promissory note	16,629	15,501
Lease liabilities	557	616
Total financial liabilities	39,325	20,650
Financial instrument at amortised cost [Member]
Financial assets
Cash	3,554	7,401
Restricted deposits	575	809
Amounts receivable and other assets	650	738
Total financial assets	4,779	8,948
Financial liabilities
Accounts payable and accruals	2,620	4,408
Convertible debt	18,747
Promissory note	16,629	15,501
Lease liabilities	557	616
Total financial liabilities	38,553	20,525
Financial instrument at fair value through profit or loss [Member]
Financial assets
Cash	0	0
Restricted deposits	12,401	10,640
Amounts receivable and other assets	2,382	2,176
Total financial assets	14,783	12,816
Financial liabilities
Accounts payable and accruals	772	125
Convertible debt	0
Promissory note	0	0
Lease liabilities	0	0
Total financial liabilities	$ 772	$ 125

Financial Instruments and Ris_5

Financial Instruments and Risk Management - Disclosure of Financial Instruments by type of Interest Rate (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Nov. 01, 2018
Disclosure Of Risk Management Strategy Related To Hedge Accounting Line Items
Cash and restricted deposits	$ 12,976	$ 11,449	$ 10,000
Promissory note	16,629	15,501
Interest rate risk [Member]
Disclosure Of Risk Management Strategy Related To Hedge Accounting Line Items
Cash and restricted deposits	16,530	18,850
Promissory note	$ 16,629	$ 15,501