Starcore International Mines (SHVLF) 20-F 30 Jul 18 2018 FY Annual report (foreign) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Apr. 30, 2018shares
Document - Document and Entity Information [Abstract]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Apr. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	SAM
Entity Registrant Name	Starcore International Mines Ltd.
Entity Central Index Key	1,301,713
Current Fiscal Year End Date	--04-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	49,646,851

Consolidated Statements of Fina

Consolidated Statements of Financial Position $ in Thousands, $ in Thousands	Apr. 30, 2018CAD ($)	Apr. 30, 2017CAD ($)
Current
Cash	$ 2,321	$ 5,558
Short-term Investments (note 5)	0	4,005
Amounts Receivable (note 6)	3,348	4,777
Inventory (note 7)	3,499	2,921
Prepaid Expenses and Advances	355	349
Total Current Assets	9,523	17,610
Non-Current
Mining Interest, Plant and Equipment (notes 8 & 11)	41,476	52,921
Exploration and Evaluation Assets (note 9)	5,177	5,955
Reclamation Deposits	165	165
Deferred Tax Assets (note 18)	8,110	5,445
Total Non-Current Assets	54,928	64,486
Total Assets	64,451	82,096
Current
Trade and Other Payables	4,774	2,496
Current Portion of Loan Payable (note 10)		1,646
Total Current Liabilities	4,774	4,142
Non-Current
Loan Payable (note 10)	1,334
Rehabilitation and Closure Cost Provision (note 11)	1,162	1,131
Deferred Tax Liabilities (note 18)	8,113	11,905
Total Non-Current Liabilities	10,609	13,036
Total Liabilities	15,383	17,178
Equity
Share Capital (note 12)	50,725	50,605
Equity Reserve	11,178	11,173
Foreign Currency Translation Reserve	1,234	5,209
Accumulated Deficit	(14,069)	(2,069)
Total Equity	49,068	64,918
Total Liabilities and Equity	$ 64,451	$ 82,096

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Loss) - CAD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Revenues
Mining	$ 21,005	$ 24,642
Purchased concentrate	6,802	2,586
Total Revenues	27,807	27,228
Cost of Operations
Mining	(20,672)	(18,641)
Purchased concentrate	(7,150)	(2,151)
Depreciation and depletion	(4,913)	(5,610)
Total Cost of Sales	(32,735)	(26,402)
Earnings (Loss) from operations	(4,928)	826
Financing costs (note 10)	(61)	(626)
Foreign exchange gain	193	1,283
Management fees and salaries (notes 12 & 14)	(1,514)	(1,642)
Office and administration	(1,908)	(1,368)
Professional and consulting fees	(1,204)	(731)
Property investigation costs (note 9)	(433)
Regulatory and transfer agent fees	(166)	(218)
Shareholder relations	(198)	(291)
Loss before other income (loss)	(10,219)	(2,767)
Other Income (Loss)
Gain on sale of San Pedrito (note 8)		7,128
Impairment of Mining Interest, Plant and Equipment (note 8)	(6,713)
Loss on disposal of Exploration and Evaluation Asset (note 9)	(1,013)
Total other income (loss)	(7,726)	7,128
Earnings (loss) before taxes	(17,945)	4,361
Income tax recovery (note 18)
Deferred	5,945	2,861
Earnings (Loss) for the year	(12,000)	7,222
Item that may subsequently be reclassified to loss
Foreign currency translation differences	(3,975)	(177)
Comprehensive income (loss) for the year	$ (15,975)	$ 7,045
Basic (loss) earnings per share (note 16)	$ (0.24)	$ 0.15
Diluted (loss) earnings per share (note 16)	$ (0.24)	$ 0.15

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - CAD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Cash provided by Operating activities
Earnings (Loss) for the year	$ (12,000)	$ 7,222
Items not involving cash:
Depreciation and depletion	5,032	5,628
Gain on sale of San Pedrito	7,726	(7,128)
Income tax (recovery) (note 18)	(5,945)	(2,861)
Interest on long-term debt (note 10)	83	536
Rehabilitation and closure cost accretion (note 11)	64	80
Unwinding of discount on long-term debt (note 10)		48
Share-based compensation (note 12)	(64)	267
Impairment of Mining Interest, Plant and Equipment (note 8)	6,713
Loss on disposal of Exploration and Evaluation Asset (note 9)	1,013
Write-down for obsolete equipment (note 8)		37
Cash generated by (used in) operating activities before working capital changes	(5,104)	3,829
Change in non-cash working capital items
Amounts receivable	(475)	(559)
Inventory	(1,181)	(1,591)
Prepaid expenses and advances	(78)	(214)
Trade and other payables	826	595
Cash inflow (outflow) for operating activities	(6,012)	2,060
Financing activities
Issuance of shares (note 12)	125
Advance of loan payable (note 10)	1,283
Repayment of loan payable (note 10)	(1,213)	(4,500)
Interest paid (note 10)	(311)	(538)
Financing fees (note 10)		(45)
Cash outflow for financing activities	(116)	(5,083)
Investing activities
Cash acquired on sale of San Pedrito (note 8)	832	10,171
Interest received	86	57
Investment in exploration and evaluation assets (note 9)	(481)	(2,068)
Purchase of mining interest, plant and equipment (note 8)	(2,190)	(2,709)
Sale of Exploration and Evaluation property (note 9)	128
Sale of short-term investments (note 5)	4,022	1,769
Cash inflow for investing activities	2,397	7,220
Total increase (decrease) in cash	(3,731)	4,197
Effect of foreign exchange rate changes on cash	494	(2,887)
Cash, beginning of year	5,558	4,248
Cash, end of year	$ 2,321	$ 5,558

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - CAD ($) $ in Thousands	Total	Issued capital [member]	Treasury shares [member]	Reserve of change in value of foreign currency basis spreads [member]	Accumulated other comprehensive income [member]
Beginning balance at Apr. 30, 2016	$ 57,873	$ 50,605	$ 11,173	$ 5,386	$ (9,291)
Beginning balance, shares at Apr. 30, 2016	49,146,851
Issued for cash pursuant to:
Foreign currency translation	$ (177)			(177)
Earnings (Loss) for the year	7,222				7,222
Ending balance at Apr. 30, 2017	$ 64,918	50,605	11,173	5,209	(2,069)
Ending balance, shares at Apr. 30, 2017	49,146,851
Issued for cash pursuant to:
Private placement (Note 12)	$ 125	120	5
Private placement, shares outstanding	500,000
Foreign currency translation	$ (3,975)			(3,975)
Earnings (Loss) for the year	(12,000)				(12,000)
Ending balance at Apr. 30, 2018	$ 49,068	$ 50,725	$ 11,178	$ 1,234	$ (14,069)
Ending balance, shares at Apr. 30, 2018	49,646,851

Consolidated Statements of Cha6

Consolidated Statements of Changes in Equity (Parenthetical)	12 Months Ended
	Apr. 30, 2018$ / shares
Statement of changes in equity [abstract]
Private placement, per share value	$ 0.25

Corporate Information

Corporate Information	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Corporate Information	1. Corporate Information Starcore International Mines Ltd. is the parent company of its consolidated group (the “Company” or “Starcore”) and was incorporated in Canada with its head office located at Suite 750 – 580 Hornby Street, Vancouver, British Columbia, V6C 3B6. Starcore is engaged in exploring, extracting and processing gold and silver through its wholly-owned subsidiaries, Compañia Minera Peña de Bernal, S.A. de C.V. (“Bernal”), which owns the San Martin mine in Queretaro, Mexico and Altiplano GoldSilver S.A. de C.V (“Altiplano”), which owns the gold and silver concentrate processing plant in Matehuala, Mexico. The Company is also engaged in acquiring mining related operating assets and exploration assets in North America directly and through corporate acquisitions.

Basis of Preparation

Basis of Preparation	12 Months Ended
	Apr. 30, 2018
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Basis of Preparation	2. Basis of Preparation a) Statement of Compliance These consolidated financial statements for the Company have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”). The financial statements were authorized for issue by the Board of Directors on July 27, 2018. b) Basis of Measurement The consolidated financial statements have been prepared on a historical cost basis, except certain financial instruments, which are measured at fair value, as explained in the Company’s accounting policies discussed in note 3. The consolidated financial statements are presented in Canadian dollars, which is also the parent company’s functional currency, and all values are rounded to the nearest thousand dollars, unless otherwise indicated. The preparation of consolidated financial statements in compliance with IFRS requires management to make certain critical accounting estimates. It also requires management to exercise judgment in applying the Company’s accounting policies. The areas involving a higher degree of judgment of complexity, or areas where assumptions and estimates are significant to the consolidated financial statements are disclosed in note 4. c) Basis of Consolidation These consolidated financial statements include the accounts of the Company and all of its subsidiaries, which are entities controlled by the Company. Control exists when the Company has the power to govern the financial and operating policies of an entity so as to obtain benefits from the entity’s activities. Subsidiaries are included in the consolidated financial results of the Company from the effective date of acquisition up to the effective date of disposal or loss of control. The Company’s wholly-owned subsidiaries, Bernal and Altiplano, along with various other subsidiaries, carry out their operations in Mexico, U.S.A. and in Canada. All intra-group transactions, balances, income and expenses are eliminated, in full, on consolidation.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Summary of Significant Accounting Policies	3. Summary of Significant Accounting Policies The accounting policies set out below were applied consistently to all periods presented in these consolidated financial statements, unless otherwise indicated. a) Foreign Currency Translation The functional currency of Starcore, the parent, is the Canadian dollar (“CAD”) and the functional currency of its subsidiaries is the United States dollar (“USD”) (collectively “Functional Currency”). Foreign currency accounts are translated into the Functional Currency as follows: • At the transaction date, each asset, liability, revenue and expense denominated in a foreign currency is translated into the Functional Currency by the use of the exchange rate in effect at that date. At the period end date, unsettled monetary assets and liabilities are translated into the Functional Currency by using the exchange rate in effect at the period end. Foreign exchange gains and losses are recognized in net earnings and presented in the Consolidated Statement of Operations and Comprehensive Income in accordance with the nature of the transactions to which the foreign currency gains and losses relate, except for foreign exchange gains and losses from translating available-for-sale b) Foreign Operations The assets and liabilities of foreign operations with Functional Currencies differing from the presentation currency, including fair value adjustments arising on acquisition, are translated to CAD at exchange rates in effect at the reporting date. The income and expenses of foreign operations with Functional Currencies differing from the presentation currency are translated into CAD at the year-to-date The Company’s foreign currency differences are recognised and presented in other comprehensive income as a foreign currency translation reserve (“Foreign Currency Translation Reserve”), a component of equity. When a foreign operation is disposed of such that control, significant influence or joint control is lost, the cumulative amount in the translation reserve related to that foreign operation is reclassified to profit or loss as part of the gain or loss on disposal. c) Cash and Cash Equivalents Cash and cash equivalents includes cash on hand, deposits held at call with financial institutions and other short-term, highly liquid investments with original maturities of three months or less that are readily convertible to known amounts of cash and subject to an insignificant risk of change in value. At April 30, 2018 and April 30, 2017, the Company has no cash equivalents. d) Short Term Investments Short term investments, which consist of fixed term deposits held at a bank with a maturity with a maturity of more than three months at the time of issuance, are recorded at fair value. e) Revenue Recognition Revenue from the sale of metals is recognized when the significant risks and rewards of ownership have passed to the buyer, it is probable that economic benefits associated with the transaction will flow to the Company, the sale price can be measured reliably, the Company has no significant continuing involvement and the costs incurred or to be incurred in respect of the transaction can be measured reliably. Revenues from metal concentrate sales are subject to adjustment upon final settlement of metal prices, weights, and assays as of a date that may be up to two weeks after the shipment date. The Company records adjustments to revenues monthly based on quoted forward prices for the expected settlement period. Adjustments for weights and assays are recorded when results are determinable or on final settlement. Accounts receivable for metal concentrate sales are therefore measured at fair value. f) Inventory Finished goods and work-in-process Ore extracted from the mines is processed into finished goods (gold and by-products work-in-process work-in-process Supplies are measured at average cost. In the event that the net realizable value of the finished product, the production of which the supplies are held for use in, is lower than the expected cost of the finished product, the supplies are written down to net realizable value. Replacement costs of supplies are generally used as the best estimate of net realizable value. The costs of inventories sold during the year are presented in the Company’s profit and loss. g) Mining Interest, Plant and Equipment Mining interests represent capitalized expenditures related to the development of mining properties and related plant and equipment. Recognition and Measurement On initial recognition, equipment is valued at cost, being the purchase price and directly attributable cost of acquisition or construction required to bring the asset to the location and condition necessary to be capable of operating in the manner intended by the Company, including appropriate borrowing costs and the estimated present value of any future unavoidable costs of dismantling and removing items. The corresponding liability is recognized within provisions. Mining expenditures incurred either to develop new ore bodies or to develop mine areas in advance of current production are capitalized. Mine development costs incurred to maintain current production are included in the consolidated statement of operations. Exploration costs relating to the current mine in production are expensed to net income as incurred due to the immediate exploitation of these areas or an immediate determination that they are not exploitable. Borrowing costs that are directly attributable to the acquisition and preparation for use, are capitalized. Capitalization of borrowing costs, begins when expenditures are incurred and activities are undertaken to prepare the asset for its intended use. The amount of borrowing costs capitalized cannot exceed the actual amount of borrowing costs incurred during the period. All other borrowing costs are expensed as incurred. The capitalization of borrowing costs is discontinued when substantially all of the activities necessary to prepare the qualifying asset for its intended use or sale are complete. Capitalized borrowing costs are amortized over the useful life of the related asset. Major Maintenance and Repairs Subsequent costs are included in the asset’s carrying amount or recognized as a separate asset, as appropriate, only when it is probable that the future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably. All other repairs and maintenance are charged to the Company’s profit or loss during the financial year in which they are incurred. Subsequent Costs The cost of replacing part of an item of equipment is recognized in the carrying amount of the item if it is probable that the future economic benefits embodied within the part will flow to the Company and its costs can be measured reliably. The carrying amount of the replaced part is derecognized. The costs of the day-to-day Leased Equipment Leased assets in which the Company receives substantially all of the risks and rewards of ownership of the asset are capitalized as finance leases at the lower of the fair value of the asset or the estimated present value of the minimum lease payments. The corresponding lease obligation is recorded within debt on the statement of financial position. Assets under operating leases are not capitalized and rental payments are included in earnings based on the terms of the lease. Derecognition Upon sale or abandonment, the cost of the property, plant, and equipment and related accumulated depreciation or depletion, are removed from the accounts and any gains or losses thereon are included in operations. Depreciation and Impairment Mining interest, plant and equipment are subsequently measured at cost less accumulated depreciation, less any accumulated impairment losses, with the exception of land which is not depreciated. Depletion of mine properties is charged on a unit-of-production The Company reviews and evaluates its mining interests, plant and equipment for impairment at least annually or when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Impairment is considered to exist if the recoverable value of a cash generating unit is less than the carrying amount of the assets. An impairment loss is measured and recorded based on the greater of the cash generating unit’s fair value less cost to sell or its value in use versus its carrying value. Future cash flows are estimated based on expected future production, commodity prices, operating costs and capital costs. Mining interests, plant and equipment that have been impaired in prior periods are tested for possible reversal of impairment whenever events or changes in circumstances indicate that the impairment has reversed. If the impairment has reversed, the carrying amount of the asset is increased to its recoverable amount but not beyond the carrying amount that would have been determined had no impairment loss been recognized for the asset in the prior periods. A reversal of an impairment loss is recognized in the consolidated statement of operations. h) Rehabilitation and Closure Cost Provision The Company records a provision for the estimated future costs of rehabilitation and closure of operating and inactive mines and development projects, which are discounted to net present value using the risk free interest rates applicable to the future cash outflows. Estimates of future costs represent management’s best estimates which incorporate assumptions on the effects of inflation, movements in foreign exchange rates and the effects of country and other specific risks associated with the related liabilities. The provision for the Company’s rehabilitation and closure cost obligations is accreted over time to reflect the unwinding of the discount with the accretion expense included in finance costs in the Consolidated Statement of Operations and Comprehensive Income. The provision for rehabilitation and closure cost obligations is re-measured Rehabilitation and closure cost obligations relating to operating mines and development projects are initially recorded with a corresponding increase to the carrying amounts of related mining properties. Changes to the obligations are also accounted for as changes in the carrying amounts of related mining properties, except where a reduction in the obligation is greater than the capitalized rehabilitation and closure costs, in which case, the capitalized rehabilitation and closure costs is reduced to nil and the remaining adjustment is included in production costs in the Consolidated Statement of Operations and Comprehensive Income. Rehabilitation and closure cost obligations related to inactive mines are included in production costs in the Consolidated Statement of Operations and Comprehensive Income on initial recognition and subsequently when re-measured. i) Exploration and Evaluation Expenditures Once the legal right to explore a property has been acquired, costs directly related to exploration and evaluation (“E&E”) expenditures are recognized and capitalized, in addition to the acquisition costs. These direct expenditures include such costs as materials used, surveying and sampling costs, drilling costs, payments made to contractors, geologists, consultants, and depreciation on plant and equipment during the exploration phase. Costs not directly attributable to E&E activities, including general and administrative overhead costs, are expensed in the period in which they occur. When a project is determined to no longer have commercially viable prospects to the Company, E&E expenditures in respect of that project are deemed to be impaired. As a result, those E&E expenditures, in excess of estimated recoveries, are written off to the Company’s profit or loss. The Company assesses E&E assets for impairment when facts and circumstances suggest that the carrying amount of an asset may exceed its recoverable amount. Once the technical feasibility and commercial viability of extracting the mineral resource has been determined, the property is considered to be a mine under development and is classified as “mines under construction”. E&E assets are tested for impairment before the assets are transferred to development properties. Any incidental revenues earned in connection with exploration activities are applied as a reduction to capitalized exploration costs. j) Financial Instruments Financial instruments are classified as one of the categories below based upon the purpose for which the asset was acquired. All transactions related to financial instruments are recorded on a trade date basis. The Company’s accounting policy for each category is as follows: Loans and Receivables Loans and receivables are non-derivative Amortised cost is calculated taking into account any discount or premium on acquisition and includes fees that are an integral part of the effective interest rate and transaction costs. Gains and losses are recognized in the profit or loss when the loans and receivables are derecognized or impaired, as well as through the amortization process. The Company’s cash is accounted for at fair value and amounts receivable are all accounted for as loans and receivables. Available-for-Sale Non-derivative available-for-sale. Available-for-sale available-for-sale available-for-sale Purchases and sales of available-for-sale Impairment of Financial Assets At each reporting date, the Company assesses whether there is any objective evidence that a financial asset or a group of financial assets is impaired. A financial asset or group of financial assets is deemed to be impaired if, there is objective evidence of impairment as a result of one or more events that has occurred subsequent to the initial recognition of the asset and that event has an impact on the estimated future cash flows of the financial asset or the group of financial assets. Financial Liabilities Financial liabilities are classified as other financial liabilities, based on the purpose for which the liability was incurred, and comprised of trade and other payables, and loan payable. These liabilities are recognized at fair value, net of any transaction costs directly attributable to the issuance of the instrument and subsequently carried at amortised cost using the effective interest rate method. This ensures that, any interest expense over the period to repayment is at a constant rate on the balance of the liability carried in the statement of financial position. Interest expense in this context includes initial transaction costs and premiums payable on redemption, as well as any interest or coupon payable while the liability is outstanding. Trade and other payables & loan payable represent goods and services provided to the Company prior to the end of the period which are unpaid. Trade payable amounts are unsecured and are usually paid within 30 days of recognition. Fair value hierarchy Financial instruments recognized at fair value on the consolidated balance sheets must be classified into one of the three following fair value hierarchy levels: Level 1 – measurement based on quoted prices (unadjusted observed in active markets) for identical assets or liabilities; Level 2 – measurement based on inputs other than quoted prices included in Level 1, that are observable for the asset or liability; Level 3 – measurement based on inputs that are not observable (supported by little or no market activity) for the asset or liability. The Company’s financial instruments recognized at fair value consist of short term investments having a fair value of $Nil (2017 – $4,005) measured in accordance with Level 1. k) Income Taxes Current tax and deferred taxes are recognized in the Company’s profit or loss, except to the extent that it relates to a business combination or items recognized directly in equity or in other comprehensive loss/income. Current income taxes are recognized for the estimated taxes payable or receivable on taxable income or loss for the current year and any adjustment to income taxes payable in respect of previous years. Current income taxes are determined using tax rates and tax laws that have been enacted or substantively enacted by the period end date. Deferred tax assets and liabilities are recognized where the carrying amount of an asset or liability differs from its tax base, except for taxable temporary differences arising on the initial recognition of goodwill and temporary differences arising on the initial recognition of an asset or liability in a transaction which is not a business combination and at the time of the transaction affects neither accounting nor taxable profit or loss. Recognition of deferred tax assets for unused tax losses, tax credits and deductible temporary differences is restricted to those instances where it is probable that future taxable profit will be available against which the deferred tax asset can be utilised. At the end of each reporting period, the Company reassesses unrecognized deferred tax assets. The Company recognizes a previously unrecognized deferred tax asset to the extent that it has become probable that future taxable profit will allow the deferred tax asset to be recovered. l) Share Capital Financial instruments issued by the Company are classified as equity, only to the extent that they do not meet the definition of a financial liability or asset. The Company’s common shares, share warrants and share options are classified as equity instruments. Incremental costs, directly attributable to the issue of new shares, warrants or options, are shown in equity as a deduction, net of tax, from proceeds. m) Profit or Loss per Share Basic profit or loss per share is computed by dividing the Company’s profit or loss applicable to common shares by the weighted average number of common shares outstanding for the relevant period. Diluted profit or loss per share is computed by dividing the Company’s profit or loss applicable to common shares, by the sum of the weighted average number of common shares outstanding and all additional common shares that would have been outstanding if potentially dilutive instruments were converted at the beginning of the period. n) Share-based Payments Where equity-settled share options are awarded to employees or non-employees, Non-vesting non-vesting Where the terms and conditions of options are modified before they vest, the increase in the fair value of the options, measured immediately before and after the modifications, is charged to the Company’s profit or loss over the remaining vesting period. Where equity instruments are granted to employees, they are recorded at the fair value of the equity instrument granted at the grant date. The grant date fair value is recognized in the Company’s profit or loss over the vesting period, described as the period during which all the vesting conditions are to be satisfied. Where equity instruments are granted to non-employees, When the value of goods or services received in exchange for the share-based payment cannot be reliably estimated, the fair value is measured by use of a valuation model. The expected life used in the model is adjusted, based on management’s best estimate, for effects of non-transferability, All equity-settled share based payments are reflected in equity reserve, until exercised. Upon exercise, shares are issued from treasury and the amount reflected in equity reserve is credited to share capital, adjusted for any consideration paid. Where a grant of options is cancelled or settled during the vesting period, excluding forfeitures when vesting conditions are not satisfied, the Company immediately accounts for the cancellation as an acceleration of vesting and immediately recognizes the amount that otherwise would have been recognized for services received over the remainder of the vesting period. Any payment made to the employee on the cancellation is accounted for as the repurchase of an equity interest except to the extent that the payment exceeds the fair value of the equity instrument granted, measured at the repurchase date. Any such excess is recognized as an expense. Where vesting conditions are not satisfied and options are forfeited, the Company reverses the fair value amount of the unvested options which had been recognized over the vesting period. o) New and Revised Accounting Standards The following accounting standards have been issued or amended but are not yet effective. The Company has not early adopted these new and amended standards. The Company continues to evaluate the new standards but currently no material impact is expected as a result of the adoptions of these new and amended standards: • IFRS 3 “Business Combination” • IFRS 9 “Financial Instruments” • IFRS 10 “Consolidated Financial Statements” • IFRS 16 “Leases” • IAS 12 “Income Taxes” • IAS 23 “Borrowing Costs” • IAS 28 “Investments in Associates and Joint Ventures” • IFRIC 23 “Uncertainty over Income Tax treatments”

Critical Accounting Estimates a

Critical Accounting Estimates and Judgments	12 Months Ended
	Apr. 30, 2018
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Critical Accounting Estimates and Judgments	4. Critical Accounting Estimates and Judgments The Company makes estimates and assumptions about the future that affect the reported amounts of assets and liabilities. Estimates and judgments are continually evaluated based on historical experience and other factors, including expectations of future events that are believed to be reasonable under the circumstances. In the future, actual experience may differ from these estimates and assumptions. The effect of a change in accounting estimate is recognized prospectively by including it in the Company’s profit or loss in the period of the change, if it affects that period only, or in the period of the change and future periods, if the change affects both. Information about critical judgments in applying accounting policies that have the most significant risk of causing material adjustment to the carrying amounts of assets and liabilities recognized in the consolidated financial statements within the next financial year are discussed below: a) Economic Recoverability and Profitability of Future Economic Benefits of Mining Interests Management has determined that mining interests, evaluation, development and related costs incurred which have been capitalized are economically recoverable. Management uses several criteria in its assessments of economic recoverability and probability of future economic benefit including geologic and metallurgic information, history of conversion of mineral deposits to proven and probable reserves, scoping and feasibility studies, accessible facilities, existing permits and life of mine plans. b) Impairments The Company assesses its mining interest, plant and equipment assets annually to determine whether any indication of impairment exists. Where an indicator of impairment exists, a formal estimate of the recoverable amount is made, which is considered to be the higher of the fair value less costs to sell and value in use. These assessments require the use of estimates and assumptions such as long-term commodity prices, discount rates, future capital requirements, exploration potential and operating performance. c) Rehabilitation Provisions Rehabilitation provisions have been created based on the Company’s internal estimates. Assumptions, based on the current economic environment, have been made which management believes are a reasonable basis upon which to estimate the future liability. These estimates take into account any material changes to the assumptions that occur when reviewed regularly by management. Estimates are reviewed annually and are based on current regulatory requirements. Significant changes in estimates of contamination, restoration standards and techniques will result in changes to provisions from period to period. Actual rehabilitation costs will ultimately depend on future market prices for the rehabilitation costs, which will reflect the market condition at the time that the rehabilitation costs are actually incurred. The final cost of the currently recognized rehabilitation provision may be higher or lower than currently provided. The inflation rate applied to estimated future rehabilitation and closure costs is 3.5% and the discount rate currently applied in the calculation of the net present value of the provision is 8%. d) Income Taxes Significant judgment is required in determining the provision for income taxes. There are many transactions and calculations undertaken during the ordinary course of business for which the ultimate tax determination is uncertain. The Company recognizes liabilities and contingencies for anticipated tax audit issues based on the Company’s current understanding of tax law. For matters where it is probable that an adjustment will be made, the Company records its best estimate of the tax liability including the related interest and penalties in the current tax provision. Management believes they have adequately provided for the probable outcome of these matters; however, the final outcome may result in a materially different outcome than the amount included in the tax liabilities. In addition, the Company recognizes deferred tax assets relating to tax losses carried forward to the extent there are sufficient taxable temporary differences (deferred tax liabilities) relating to the same taxation authority and the same taxable entity against which the unused tax losses can be utilized. However, utilization of the tax losses also depends on the ability of the taxable entity to satisfy certain tests at the time the losses are recuperated. e) Share-based Payment The Company measures the cost of equity-settled transactions with employees, and some with non-employees, This estimate also requires determining the most appropriate inputs to the valuation model including the expected life of the share option, expected forfeiture rate, volatility and dividend yield and making assumptions about them. The assumptions and models used for estimating fair value for share-based payment transactions are disclosed in the notes. f) Mineral Reserves and Mineral Resource Estimates Mineral reserves are estimates of the amount of ore that can be economically and legally extracted from the Company’s mining properties. The Company estimates its mineral reserve and mineral resources based on information compiled by Qualified Persons as defined by Canadian Securities Administrators National Instrument 43-101 g) Units of production depletion Estimated recoverable reserves are used in determining the depreciation of mine specific assets. This results in depreciation charges proportional to the depletion of the anticipated remaining life of mine production. Each item’s life, which is assessed annually, has regard to both its physical life limitations and to present assessments of economically recoverable reserves of the mine property at which the asset is located. These calculations require the use of estimates and assumption, including the amount of recoverable reserves and estimate of future capital expenditure. Changes are accounted for prospectively.

Short-term Investments

Short-term Investments	12 Months Ended
	Apr. 30, 2018
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Short-term Investments	5. Short-term Investments The Company purchases Guaranteed Investment Certificate (“GIC”) denominated in USD and Mexican Pesos (“MP”) as Short-term Investments. During the period ending April 30, 2018, the Company held $Nil (April 30, 2017—$409) in regards to GIC denominated in USD. The Company also held $Nil (April 30, 2017—$3,596) GIC denominated in MP.

Amounts Receivable

Amounts Receivable	12 Months Ended
	Apr. 30, 2018
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Amounts Receivable	6. Amounts Receivable April 30, April 30, Taxes receivable $ 1,941 $ 1,911 San Pedrito sale (note 8) 1,359 2,644 Trades receivable — 148 Other 48 74 $ 3,348 $ 4,777

Inventory

Inventory	12 Months Ended
	Apr. 30, 2018
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Inventory	7. Inventory April 30, 2018 April 30, Carrying value of inventory: Doré $ 955 $ 922 Goods in transit 376 429 Work-in-process 662 377 Concentrate 595 189 Stockpile 118 196 Supplies 793 808 $ 3,499 $ 2,921

Mining Interest, Plant and Equi

Mining Interest, Plant and Equipment	12 Months Ended
	Apr. 30, 2018
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Mining Interest, Plant and Equipment	8. Mining Interest, Plant and Equipment Mining Plant and Plant and Corporate Total Cost Balance, April 30, 2016 $ 70,018 $ 20,308 $ 6,327 $ 605 $ 97,258 Additions 484 2,034 119 72 2,709 Write-down of equipment — (37 ) — — (37 ) Disposal of San Pedrito (5,249 ) — — — (5,249 ) Effect of foreign exchange 7,795 1,394 559 — 9,748 Balance, April 30, 2017 73,048 23,699 7,005 677 104,429 Additions 902 2,720 78 15 3,715 Write-down of equipment (5,000 ) (1,925 ) — — (6,925 ) Effect of foreign exchange (4,592 ) (1,318 ) (429 ) — (6,339 ) Balance, April 30, 2018 $ 64,358 $ 23,176 $ 6,654 $ 692 $ 94,880 Depreciation Balance, April 30, 2016 $ 31,781 $ 8,516 $ — $ 343 $ 40,640 Depreciation for the year 3,786 1,532 220 90 5,628 Effect of foreign exchange 4,090 1,142 8 — 5,240 Balance, April 30, 2017 39,657 11,190 228 433 51,508 Depreciation for the year 2,887 1,621 434 90 5,032 Write-down of equipment — (212 ) — — (212 ) Effect of foreign exchange (2,232 ) (680 ) (12 ) — (2,924 ) Balance, April 30, 2018 $ 40,312 $ 11,919 $ 650 $ 523 $ 53,404 Carrying amounts Balance, April 30, 2017 $ 33,391 $ 12,509 $ 6,777 $ 244 $ 52,921 Balance, April 30, 2018 $ 24,046 $ 11,257 $ 6,004 $ 169 $ 41,476 Impairment on Mining Interest The Company considered that the carrying amount of its assets being higher than market capitalization of the Company at April 30, 2018 was an indicator of impairment. In determining the recoverable amounts of the Company’s mining interests, the Company’s management makes estimates of the discounted future cash flows expected to be derived from the Company’s mining properties, costs to sell the mining properties and the appropriate discount rate. The projected cash flows are significantly affected by changes in assumptions about gold’s selling price, future capital expenditures, changes in the amount of recoverable reserves, resources, and exploration potential, production cost estimates, discount rates and exchange rates. Based on the calculation, at April 30, 2018, management has decided to record an impairment of $5,000 on the San Martin Project. The key assumptions used for assessing the recoverable amount are gold price of USD $1,300/oz and a discount rate of 9%. Management has also determined that the CIL plant constructed in 2016 is no longer useful in the operations of the San Martin mine in Queretaro, Mexico. While this plant has a value as a functioning carbon leach plant and has operated to process third party carbon concentrates, the Company cannot guarantee its usefulness in the future or the ability to attract third party carbon concentrates for processing. As a result, management has decided to write down the plant to $nil value and record an impairment of the book value of $1,713 to the Statements of Operations and Comprehensive Income (Loss). Sale of San Pedrito On March 21, 2017, the Company finalized the sale of its San Pedrito Property, a non-core Details of the transaction are as follows: Total surface area sold covers 74.0831.544 hectares (740,831.544 square meters) sold at $250 pesos per square meter. Payments are staged as follows: Surface Area in hectares (ha) Equivalent in Mexican Pesos (4) Canadian (2)(4) Status 55.068 ha 550,685.485 sm MXN$ 137,671,371 C$ 9,640,852 Interest Received MXN$ 7,576,445 C$ 530,563 MXN$ 145,247,816 C$ 10,171,415 Payment received Parcel of 12 ha ( ¹ ) 120,000.000 sm MXN$ 30,000,000 C$ 2,100,840 Pending clearance Parcel of 2.014 ha (¹) 20,146.059 sm MXN$ 5,036,515 C$ 352,697 Pending clearance Parcel of 5 ha 50,000.000 sm MXN$ 12,500,000 C$ 832,731 (3) Payment received (1) The remaining two parcels await various confirmations from different local and federal authorities. As the Company receives these confirmations, the buyer will immediately remit the corresponding payment for each parcel of land. It is expected that these clearances will be confirmed within the next 6 months. (2) Based on exchange rate of 14.28 Pesos/CAD$ as at close of March 21, 2017. (3) Based on exchange rate of 15.01 Pesos/CAD$ on the actual date of collection on November 8, 2017. (4) Amounts are not rounded to the nearest thousand. Altiplano Facility On August 5, 2015, the Company acquired Cortez Gold Corp. (“Cortez”) (TSXV: CUT) in an all-share The Company’s management determined the commencement of commercial production to begin on November 1, 2016. As a result, prior to commencement of commercial production, all of the pre-operational

Exploration and Evaluation Asse

Exploration and Evaluation Assets	12 Months Ended
	Apr. 30, 2018
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Exploration and Evaluation Assets	9. Exploration and Evaluation Assets a) American Consolidated Minerals (“AJC”) properties Pursuant to the Acquisition of AJC, the Company has acquired the rights to three exploration properties as follows: i) Lone Ranch, U.S.A The Company has acquired the right to a 100% undivided interest, subject to a 3% net smelter royalty (“NSR”), in 73 mining claims located in Ferry County, Washington State, United States of America (“Lone Ranch”) from MinQuest Inc. (“MinQuest”). Consideration to be paid for the interest is USD$360 (payable over 5 years commencing October 19, 2018), and the Company must incur total exploration expenditures of USD$1,225 (USD$175 incurred) on the property, by the third anniversary of October 19, 2018 as agreed by MinQuest. Annual payments commencing October 19, 2018 are $60, $80, $100, and $170 respectively. These payment requirements will commence earlier should the Company enter into a joint venture agreement over the property or complete a bankable feasibility study on the property. The optionor has also granted the Company the right to purchase up to one-half ii) Toiyabe, U.S.A The Company has the right to acquire a 100% undivided interest, subject to a 3% NSR, in 165 mining claims located in Lander County, Nevada, United States of America (“Toiyabe”) from MinQuest. Consideration to be paid for the interest is USD$900 (payable over 5 years commencing October 19, 2018) and the Company must incur total exploration expenditures of USD$1,025 (incurred) on the property, by the fifth anniversary of October 19, 2018 as agreed by MinQuest. Annual payments commencing October 19, 2018 are $60, $80, $100, $120, $140 and $400 respectively. These payment requirements will commence earlier should the Company enter into a joint venture agreement over Toiyabe or complete a bankable feasibility study on the property. The optionor has also granted the Company the right to purchase up to one-half iii) Sierra Rosario, Mexico The Company acquired a 100% interest in the 978-hectare During the current year ended April 30, 2018, the Company entered into an agreement to sell the claims of the Sierra Rosario property. The Company received proceeds of $128 ($100 USD) over a six month period. The excess of property costs over the recovered amount of $1,013 was recognized as a loss on disposal of exploration and evaluation assets in the Statement of Profit or Loss and Other Comprehensive Income (Loss). b) Creston Moly (“Creston”) properties i) El Creston Project, Mexico The Company acquired a 100% interest in the nine mineral claims known as the El Creston molybdenum property located northeast of Hermosillo, State of Sonora, Mexico, which has completed a Preliminary Economic Assessment on the property based on zones of porphyry-style molybdenum (“Mo”)/copper (“Cu”) mineralization. The mineral concessions are subject to a 3% net profits interest. ii) Ajax Project, Canada The Company acquired a 100% interest in six mineral claims known as the Ajax molybdenum property located in B.C. iii) Molybrook Project, Canada The Company owns 100% of the 44 mineral claims of the Moly Brook molybdenum property, located on the southern coast of Newfoundland. The Moly Brook property is subject to a 2% NSR, of which 1.5% can be purchased by the Company for $1,500. During the year ended April 30, 2016, the Company reduced its claims to focus of the core project and to reduce its holding costs. c) Santa Fe property On November 21, 2017, the Company announced it had entered into a Letter of Intent (“LOI”) with third parties to acquire approximately 21,000 hectares located in the state of Sinaloa, Mexico, more commonly known as the Santa Fe Project (“Santa Fe” or the “Property”). Subsequent to the year ended April 30, 2018, the Company announced that it has completed its due diligence and review of the Santa Fe Project and will not be proceeding with the proposed acquisition. The Company has no further obligations on Santa Fe property and costs of $433 associated with the property, as well as other properties being investigated, were expensed as property investigation costs in the current year. AJC Creston Santa Fe Total Acquisition costs: Balance, April 30, 2016 $ 1,083 $ 2,001 $ — $ 3,084 Effect of foreign exchange 131 — — 131 Balance, April 30, 2017 1,214 2,001 — 3,215 Property disposition (970 ) — — (970 ) Recovery on disposal of E&E Asset (128 ) — — (128 ) Effect of foreign exchange (80 ) — — (80 ) Balance, April 30, 2018 36 2,001 — 2,037 Exploration costs: Balance, April 30, 2016 121 659 — 780 Assays 82 — — 82 Exploration cost 96 — — 96 Drilling 1,288 — — 1,288 Geological 178 139 — 317 Legal fees — 41 — 41 Maintenance 56 189 — 245 Effect of foreign exchange (109 ) — — (109 ) Balance, April 30, 2017 1,712 1,028 — 2,740 Exploration cost 23 — — 23 Drilling 18 — — 18 Geological 31 13 45 89 Legal fees — 15 — 15 Maintenance 62 274 — 336 Property disposition (37 ) — (45 ) (82 ) Effect of foreign exchange — 1 — 1 Balance, April 30, 2018 $ 1,809 $ 1,331 $ — $ 3,140 Total Exploration and Evaluation Assets Balance, April 30, 2017 $ 2,926 $ 3,029 $ — $ 5,955 Balance, April 30, 2018 $ 1,845 $ 3,332 $ — $ 5,177

Loan payable

Loan payable	12 Months Ended
	Apr. 30, 2018
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Loan payable	10. Loan payable During the year ended July 31, 2015, the Company secured a $1,305 (USD $1,000) loan with a lender, bearing interest at 8% per annum, compounded annually. The full principal of $1,213 plus accrued interest of $311 for a total of $1,524 on the loan was repaid to the lender during the year ended April 30, 2018. During the current year ended April 30, 2018, the Company secured an additional $1,283 (USD $1,000) loan (“Loan”) with a lender. The Loan is secured against certain assets of the Company and bears interest at 8% per annum, compounded and paid annually. The full principal plus accrued interest on the loan shall be repayable to the lender on October 25, 2019. On November 17, 2015, the Company completed a private placement of secured bonds in the aggregate principal amount of $4,500 (“the Bonds”). The Bonds carried interest of 8% per annum, payable on November 12, 2016 and were secured against all of the Company’s asset that ranks pari passu with the existing debt obligations of the Company. During the year ended April 30, 2017, the bonds were extended by 6 months to May 12, 2017. On April 12, 2017, the Company elected an early repayment of the Bonds in the aggregate principal amount of $4.5 million. Changes to the loan payable balance during the year ended April 30, 2018 and the year ended April 30, 2017, are as follows: Principal Interest Discount Total Balance, April 30, 2016 $ 5,754 $ 282 $ (48 ) $ 5,988 Repayment on debt (4,500 ) (538 ) 48 (4,990 ) Interest accrual — 536 — 536 Foreign exchange adjustment 112 — — 112 Balance, April 30, 2017 1,366 280 — 1,646 Financing, October 25, 2017 1,283 — — 1,283 Repayment on debt (1,213 ) (311 ) — (1,524 ) Interest accrual — 83 — 83 Foreign exchange adjustment (154 ) — — (154 ) Balance, April 30, 2018 $ 1,282 $ 52 $ — $ 1,334 April 30, 2018 April 30, 2017 Current $ — $ 1,646 Non-Current 1,334 — $ 1,334 $ 1,646 Subsequent to the year ended April 30, 2018, the Company completed a private placement of secured bonds in the aggregate principal amount of $3,000 bond (see note 19). The Company’s financing costs for the year ended April 30, 2018 and April 30, 2017 as reported on its Consolidated Statement of Operations and Comprehensive Income (Loss) can be summarized as follows: For the year ended April 30, 2018 2017 Unwinding of discount on rehabilitation and closure accretion (note 11) $ 64 $ 80 Discount unwinding on debt repaid — 48 Extension fee — 45 Interest expense on debt 83 536 Interest revenue (86 ) (83 ) $61 $626

Rehabilitation and Closure Cost

Rehabilitation and Closure Cost Provision	12 Months Ended
	Apr. 30, 2018
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Rehabilitation and Closure Cost Provision	11. Rehabilitation and Closure Cost Provision The Company’s asset retirement obligations consist of reclamation and closure costs for the mine. At April 30, 2018, the present value of obligations is estimated at $1,162 (2017—$1,131) based on expected undiscounted cash-flows at the end of the mine life of MXN$ 18,729 or $1,280 (2017—$1,347), which is calculated annually over 5 to 10 years. Such liability was determined using a discount rate of 8% (2017—8%) and an inflation rate of 3.5% (2017—3.5%). Significant reclamation and closure activities include land rehabilitation, demolition of buildings and mine facilities, closing portals to underground mining areas and other costs. Changes to the reclamation and closure cost balance during the year are as follows: April 30, April 30, Balance, beginning of year $ 1,131 $ 1,091 Accretion expense 64 80 Foreign exchange fluctuation (33 ) (40 ) Balance, end of year $ 1,162 $ 1,131

Share Capital

Share Capital	12 Months Ended
	Apr. 30, 2018
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Share Capital	12. Share Capital a) Common Shares The Company is authorized to issue an unlimited number of common shares, issuable in series. The holders of common shares are entitled to one vote per share at meetings of the Company and to receive dividends, which may be declared from time-to-time. During the year ended April 30, 2018, the Company: • Completed a non-brokered one-half The Company calculated the fair value of the share component to be the lesser of the market price for the shares on the date of grant, which was $0.24 per share, and the offering price, which was $0.25 per unit. The shares, therefore, had a market price of $0.24 per share or $120 and the fair value of the warrants was calculated as the difference of $5. As such, share capital was increased by $120 and equity reserve increased by $5. During the year ended April 30, 2017, the Company did not issue any common shares. b) Warrants A summary of the Company’s outstanding share purchase warrants at April 30, 2018 and 2017 and the changes during the year ended is presented below: Number of Weighted Outstanding at April 30, 2016 139,284 $ 1.20 Warrants expired (139,284 ) 1.20 Outstanding at April 30, 2017 — — Warrants issued 250,000 0.30 Outstanding at April 30, 2018 250,000 $ 0.30 A summary of the Company’s outstanding share purchase warrants is presented below: Number of Warrants Exercise Expiry Date 250,000 $ 0.30 March 7, 2022 c) Share-based Payments The Company, in accordance with the policies of the TSX, was previously authorized to grant options to directors, officers, and employees to acquire up to 20% of the amount of stock outstanding. In January 2014, the Company’s shareholders voted to cancel the Company’s option plan and, as a result, the Company’s Board of Directors may not grant further options. The Company’s management and directors are reviewing alternative compensation arrangements for the Company’s employees and directors. The following is a summary of changes in options for the years ending April 30, 2018 and 2017: Number of Weighted Average Balance at April 30, 2016 2,846,250 $ 1.07 Forfeited/expired (1,497,500 ) 1.23 Balance at April 30, 2017 1,348,750 0.90 Forfeited (400,000 ) 0.94 Outstanding and Exercisable at April 30, 2018 948,750 $ 0.88 The following is a summary of the Company’s outstanding and exercisable options at April 30, 2018: Number Outstanding Weighted Weighted 50,000 $ 1.00 0.37 50,000 $ 0.80 0.31 50,000 $ 0.92 0.35 798,750 $ 0.88 0.71 948,750 $ 0.88 0.65 d) Deferred Share Units (“DSU”) & Restricted Share Units (“RSU”) Effective August 1, 2016, The Board of Directors has approved the adoption of a Restricted Share Unit and Deferred Share Unit Plan (the “RSU/DSU Plan”) as part of the Company’s compensation arrangements for directors, officers, employees or consultants of the Company or a related entity of the Company. Although the RSU/DSU Plan is share-based, all vested RSUs and DSUs will be settled in cash. No common shares will be issued. RSU The RSU plan is for eligible members of the Board of Directors, eligible employees and eligible contractors. The RSUs will vest over a period of three years from the date of grant, vesting as to one-third The Performance Conditions to be met are established by the Board at the time of grant of the RSU. RSUs that are permitted to be carried over to the succeeding years shall expire no later than August 1 st Number of Share Outstanding at April 30, 2016 — Granted 961,000 Cancelled (204,000 ) Outstanding at April 30, 2017 757,000 Granted 705,000 Exercised (178,750 ) Cancelled (42,000 ) Outstanding at April 30, 2018 1,241,250 Management has determined that 50% of the RSU’s will be deemed payable on the vesting dates based on current performance criteria measures. As such only 50% of the RSU’s have been valued at fair value of $0.195 per share. The liability portion for the year ended April 30, 2018 is $70 which has been included under Trades and Other Payables on the Statement of Financial Position. DSU The Company introduced a DSU plan for eligible directors. The DSUs are paid in full in the form of a lump sum payment no later than August 1 st DSU Awards going forward will vest on each anniversary date of the grant over a period of 3 years. The DSU share plan transactions during the period were as follows: Number of Share Outstanding at April 30, 2016 — Granted 760,000 Exercised (20,000 ) Cancelled (140,000 ) Outstanding at April 30, 2017 600,000 Granted 410,000 Outstanding at April 30, 2018 1,010,000 On August 1, 2017, the Company granted 410,000 DSUs to eligible directors. Based on the fair value of $0.195 per share, the Company has recorded a liability of $136 under Trades and Other Payable on the Statement of Financial Position.

Financial Instruments

Financial Instruments	12 Months Ended
	Apr. 30, 2018
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Financial Instruments	13. Financial Instruments All significant financial assets, financial liabilities and equity instruments of the Company are either recognized or disclosed in the consolidated financial statements together with other information relevant for making a reasonable assessment of future cash flows, interest rate risk and credit risk. Cash and short-term investments are carried at their fair value. There are no material differences between the carrying values and the fair values of any other financial assets or liabilities. In the normal course of business, the Company’s assets, liabilities and future transactions are impacted by various market risks, including currency risks associated with inventory, revenues, cost of sales, capital expenditures, interest earned on cash and the interest rate risk associated with floating rate debt. a) Currency Risk Currency risk is the risk to the Company’s earnings that arises from fluctuations of foreign exchange rates and the degree of volatility of these rates. The Company does not use derivative instruments to reduce its exposure to foreign currency risk. At April 30, 2018, the Company had the following financial assets and liabilities denominated in CAD and denominated in MXN$: In ‘000 of CAD MXN$ Cash $ 245 MP 8,305 Other working capital amounts—net $ (188 ) MP 44,441 At April 30, 2018, US dollar amounts were converted at a rate of $1.2821 Canadian dollars to $1 US dollar and MP were converted at a rate of MP18.78 to $1 US Dollar. A 10% increase or decrease in the US dollar exchange may increase or decrease annual earnings from mining operations by approximately $1,996. A 10% increase or decrease in the MP exchange rate will decrease or increase annual earnings from mining operations by approximately $487. b) Interest Rate Risk The Company’s cash earns interest at variable interest rates. While fluctuations in market rates do not have a material impact on the fair value of the Company’s cash flows, future cash flows may be affected by interest rate fluctuations. The Company is not significantly exposed to interest rate fluctuations and interest rate risk consists of two components: (i) To the extent that payments made or received on the Company’s monetary assets and liabilities are affected by changes in the prevailing market interest rates, the Company is exposed to interest rate cash flow risk. (ii) To the extent that changes in prevailing market interest rates differ from the interest rates in the Company’s monetary assets and liabilities, the Company is exposed to interest rate price risk. c) Credit Risk Credit risk is the risk that one party to a financial instrument will fail to discharge an obligation and cause the other party to incur a financial loss. The Company is exposed to credit risk with respect to its cash and short-term investments, the balance of which at April 30, 2018 is $2,321 (2017—$5,558) and $Nil (2017—$4,005), respectively. Cash of $974 (2017—$1,982) and short-term investments of $Nil (2017—$3,596) are held at a Mexican financial institution, cash of $23 (2017—$3) are held at a US financial institution and the remainder of $1,324 (2017—$3,573) and the short-term investment of $Nil (2017—$409) are held at a chartered Canadian financial institution; the Company is exposed to the risks of those financial institutions. The taxes receivable are comprised of Mexican VAT taxes receivable of $1,907 and GST receivable of $34, which are subject to review by the respective tax authority, and $1,359 related to amount owed from the sale of its San Pedrito Property (note 8). d) Liquidity Risk Liquidity risk arises from 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. The Company accomplishes this by achieving profitable operations and maintaining sufficient cash reserves. As at April 30, 2018, the Company was holding cash of $2,321 (2017—$5,558) and short-term investments of $Nil (2017—$4,005). Obligations due within twelve months 2018 2019 2020 2021 2022 and Trade and other payables $ 4,774 $ — $ — $ — $ — Current portion of loan payable — 1,334 — — — Reclamation and closure obligations $ — $ — $ — $ — $ 1,280 The Company’s trade and other payables are due in the short term. Long-term obligations include the Company’s reclamation and closure cost obligations, other long-term liabilities and deferred income taxes. Management believes that profits generated from the mine will be sufficient to meet its financial obligations. e) Commodity Risk Mineral prices and marketability fluctuate and any decline in mineral prices may have a negative effect on the Company. Mineral prices, particularly gold and silver prices, have fluctuated widely in recent years. The marketability and price of minerals which may be produced and sold by the Company will be affected by numerous factors beyond the control of the Company. These other factors include delivery uncertainties related to the proximity of its resources to processing facilities and extensive government regulations related to price, taxes, royalties, allowable production land tenure, the import and export of minerals and many other aspects of the mining business. Declines in mineral prices may have a negative effect on the Company. A 10% decrease or increase in metal prices may result in a decrease or increase of $2,781 in revenue and net income.

Commitments and related party t

Commitments and related party transactions	12 Months Ended
	Apr. 30, 2018
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Commitments and related party transactions	14. Commitments and related party transactions Except as disclosed elsewhere in these consolidated financial statements, the Company has the following commitments outstanding at April 30, 2018: a) As at April 30, 2018, the Company has shared lease commitments for office space of approximately $144 per year, expiring at various dates up to April 2020, which includes minimum lease payments and estimated taxes, but excluded operating costs, taxes and utilities, to expiry. b) As at April 30, 2018, the Company has a land lease agreement commitment with respect to the land at the mine site, for $132 per year until December 2018. The Company also has ongoing commitments on the exploration and evaluation assets of approximately $220 per year increasing over the next 5 years for the AJC properties (see Note 9). c) As at April 30, 2018, the Company has management contracts to officers and directors totaling $600 per year, payable monthly, expiring in January 2020 and US$315 per year, payable monthly, expiring in August 2021. The Company paid the following amounts to key management and directors in the years: For the year ended April 30, 2018 2017 Management fees $ 1,112 $ 958 Legal fees 64 116 Directors fees 86 187 Total $ 1,262 $ 1,261

Capital Disclosures

Capital Disclosures	12 Months Ended
	Apr. 30, 2018
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Capital Disclosures	15. Capital Disclosures The Company’s objective when managing capital is to safeguard the Company’s ability to continue as a going concern, so that it can continue to provide returns for shareholders and benefits for other stakeholders. The Company considers the items included in the consolidated statements of changes in equity as capital. The Company manages the capital structure and makes adjustments to it in light of changes in economic conditions and the risk characteristics of the underlying assets. In order to maintain or adjust the capital structure, the Company may issue new shares through private placements, sell assets to reduce debt or return capital to shareholders. The Company is not subject to externally imposed capital requirements and there were no changes to the capital management in the year ended April 30, 2018.

Earnings per Share

Earnings per Share	12 Months Ended
	Apr. 30, 2018
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Earnings per Share	16. Earnings per Share The Company calculates the basic and diluted income (loss) per share using the weighted average number of shares outstanding during each year and the diluted income (loss) per share assumes that the outstanding vested stock options and share purchase warrants had been exercised at the beginning of the year. The denominator for the calculation of income (loss) per share, being the weighted average number of shares, is calculated as follows: For the years ended April 30, 2018 April 30, 2017 Issued common share, beginning of year 49,146,851 49,146,851 Weighted average issuances 73,973 — Basic weighted average common shares 49,220,824 49,146,851 Effect of dilutive warrants and options — — Diluted weighted average common shares 49,220,824 49,146,851 Vested share purchase options totalling 948,750 at April 30, 2018 (2017—1,348,750) and share purchase warrants totaling 250,000 (2017—Nil) were not included in the computation of diluted earnings per share as the effect was anti-dilutive.

Segmented Information

Segmented Information	12 Months Ended
	Apr. 30, 2018
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Segmented Information	17. Segmented Information The Company operates in three reportable geographical and one operating segment. Selected financial information by geographical segment is as follows: Bernal Mexico Other Total Canada USA April 30, 2018 Revenue Mined Ore $ 21,005 $ — $ — $ 21,005 $ — $ — $ 21,005 Purchase Concentrate 3,976 2,826 — 6,802 — — 6,802 Cost of sales: Mined Ore (20,532 ) — (140 ) (20,672 ) — — (20,672 ) Purchase Concentrate (3,654 ) (3,496 ) — (7,150 ) — — (7,150 ) Depreciation (4,492 ) (421 ) — (4,913 ) — — (4,913 ) Earnings (loss) from operations (3,697 ) (1,091 ) (140 ) (4,928 ) — — (4,928 ) Corporate costs and taxes 4,343 294 (409 ) 4,228 (3,586 ) 12 654 Write off Mining Interest (6,713 ) — — (6,713 ) — — (6,713 ) Disposal of Exploration and Evaluation (1,079 ) — 118 (961 ) — (52 ) (1,013 ) Earnings (loss) for the year (7,145 ) (797 ) (432 ) (8,374 ) (3,586 ) (40 ) (12,000 ) Mining interest, plant and equipment 35,302 6,005 1 41,308 168 — 41,476 Total assets $ 48,614 $ 8,095 $ 3,930 $ 60,639 $ 3,537 $ 2,150 $ 66,326 Bernal Mexico Altiplano Total Canada USA April 30, 2017 Revenue Mined Ore $ 24,642 $ — $ 24,642 $ — $ — $ 24,642 Purchase Concentrate 418 2,168 2,586 — — 2,586 Cost of sales: Mined Ore (18,641 ) — (18,641 ) — — (18,641 ) Purchase Concentrate (287 ) (1,864 ) (2,151 ) — — (2,151 ) Depreciation (5,360 ) (250 ) (5,610 ) — — (5,610 ) Earnings (loss) from operations 772 54 826 — — 826 Corporate costs and taxes 3,302 (308 ) 2,994 (3,707 ) (19 ) (732 ) Sale of San Pedrito 7,128 — 7,128 — — 7,128 Earnings (loss) for the year 11,202 (254 ) 10,948 (3,707 ) (19 ) 7,222 Mining interest, plant and equipment 45,899 6,777 52,676 245 — 52,921 Total assets 61,401 11,165 72,566 7,559 1,971 82,096 During the years ended April 30, 2018 and 2017, the Company earned all of its revenues from two customers. As at April 30, 2018, the Company does not consider itself to be economically dependent on these customers as transactions with these parties can be easily replaced by transactions with other parties on similar terms and conditions. The balance owing from these customers on April 30, 2018 was $Nil (2017—$148).

Income Taxes

Income Taxes	12 Months Ended
	Apr. 30, 2018
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Income Taxes	18. Income Taxes Current and deferred income tax expenses differ from the amount that would result from applying the Canadian statutory income tax rates to the Company’s earnings before income taxes. This difference is reconciled as follows: For the periods ended April 30, 2018 April 30, 2017 (Loss) Earnings before income taxes $ (17,945 ) $ 4,361 Income tax expense (recovery) at statutory rate (5,981 ) 1,134 Difference from higher statutory tax rates on earnings of foreign subsidiaries (917 ) — Permanent Difference — (1,286 ) Effect of Mexican mining royalty tax (SMD) on deferred income tax liabilities (375 ) (3,568 ) Recognition of previously unrecognized non-capital 1,328 859 Income tax (recovery) expense $ (5,945 ) $ (2,861 ) In September 2017, the British Columbia (BC) Provincial Government of Canada proposed changes to the general corporate income tax rate to increase the rate from 11% to 12% effective January 1, 2018 and onwards. This change in tax rate was substantively enacted on October 26, 2017. The relevant deferred tax balances have been measured to reflect the increase in the Company’s combined Federal and Provincial (BC) general corporate income tax rate from 26% to 27%. The significant components of the Company’s deferred income tax assets and liabilities are as follows: April 30, 2018 April 30, 2017 Deferred income tax assets (liabilities): Mining interest, plant and equipment $ (4,235 ) $ (7,805 ) Payments to defer (172 ) (31 ) Insurance (14 ) (14 ) Reclamation and closure costs provision 956 1,018 Exploration assets (368 ) (346 ) Expenses reserve 255 146 Pension-fund reserve 200 121 Deferred mining tax (1,193 ) (1,670 ) Non-capital 5,316 4,682 Sale on San Pedrito — (2,138 ) Other (748 ) (723 ) Deferred income tax liabilities, net $ (3 ) $ (6,460 ) April 30, 2018 April 30, 2017 Non-Capital losses $ 7,580 $ 19,375 Property and equipment — 1,585 Exploration and evaluation assets 22,497 30,077 $ 30,077 $ 24,637 The Non-Capital losses are set to expire between 2026 and 2038 while the remaining loss carry forwards have no set expiry date. In accordance with Mexican tax law, Bernal is subject to income tax. Income tax is computed taking into consideration the taxable and deductible effects of inflation, such as depreciation calculated on restated asset values. Taxable income is increased or reduced by the effects of inflation on certain monetary assets and liabilities through an inflationary component. Mexico Tax Reform During December 2013, the 2014 Tax Reform (the “Tax Reform”) was published in Mexico’s official gazette with changes taking effect January 1, 2014. The Tax Reform included the implementation of a 7.5% Special Mining Duty (“SMD”) and a 0.5% Extraordinary Mining Duty (“EMD”). The Company has taken the position that SMD is an income tax under IAS 12 Income tax Management is currently disputing the SMD, in a joint action lawsuit with other Mexican mining companies, with the applicable Mexican government authority. Management believes that the SMD is unconstitutional and should be overturned. In accordance with IFRS reporting standards, however, the estimated effect of the SMD has been accrued to the current and deferred income tax provisions as stated above. Should the Company be successful in overturning the SMD, in whole or in part, the accrued tax liabilities stated above will be reversed to recovery of income taxes in the applicable period.

Subsequent event

Subsequent event	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Subsequent event	19. Subsequent event On June 18, 2018, the Company completed a private placement of secured bonds in the aggregate principal amount of $3,000 (the “Bonds”). The Bonds bear interest at 8% per annum, payable on maturity, and mature on June 18, 2020. The Bonds are secured by a charge over all of the Company’s and its subsidiaries assets. The Company has issued 3,000,000 warrants to the bond holders, each warrant entitling the bond holders to acquire one share of Starcore at a price of $0.20, expiring on June 18, 2021. The proceeds from the sale of the Bonds will be added to general working capital.

Summary of Significant Accoun26

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Foreign Currency Translation	a) Foreign Currency Translation The functional currency of Starcore, the parent, is the Canadian dollar (“CAD”) and the functional currency of its subsidiaries is the United States dollar (“USD”) (collectively “Functional Currency”). Foreign currency accounts are translated into the Functional Currency as follows: • At the transaction date, each asset, liability, revenue and expense denominated in a foreign currency is translated into the Functional Currency by the use of the exchange rate in effect at that date. At the period end date, unsettled monetary assets and liabilities are translated into the Functional Currency by using the exchange rate in effect at the period end. Foreign exchange gains and losses are recognized in net earnings and presented in the Consolidated Statement of Operations and Comprehensive Income in accordance with the nature of the transactions to which the foreign currency gains and losses relate, except for foreign exchange gains and losses from translating available-for-sale
Foreign Operations	b) Foreign Operations The assets and liabilities of foreign operations with Functional Currencies differing from the presentation currency, including fair value adjustments arising on acquisition, are translated to CAD at exchange rates in effect at the reporting date. The income and expenses of foreign operations with Functional Currencies differing from the presentation currency are translated into CAD at the year-to-date The Company’s foreign currency differences are recognised and presented in other comprehensive income as a foreign currency translation reserve (“Foreign Currency Translation Reserve”), a component of equity. When a foreign operation is disposed of such that control, significant influence or joint control is lost, the cumulative amount in the translation reserve related to that foreign operation is reclassified to profit or loss as part of the gain or loss on disposal.
Cash and Cash Equivalents	c) Cash and Cash Equivalents Cash and cash equivalents includes cash on hand, deposits held at call with financial institutions and other short-term, highly liquid investments with original maturities of three months or less that are readily convertible to known amounts of cash and subject to an insignificant risk of change in value. At April 30, 2018 and April 30, 2017, the Company has no cash equivalents.
Short Term Investments	d) Short Term Investments Short term investments, which consist of fixed term deposits held at a bank with a maturity with a maturity of more than three months at the time of issuance, are recorded at fair value.
Revenue Recognition	e) Revenue Recognition Revenue from the sale of metals is recognized when the significant risks and rewards of ownership have passed to the buyer, it is probable that economic benefits associated with the transaction will flow to the Company, the sale price can be measured reliably, the Company has no significant continuing involvement and the costs incurred or to be incurred in respect of the transaction can be measured reliably. Revenues from metal concentrate sales are subject to adjustment upon final settlement of metal prices, weights, and assays as of a date that may be up to two weeks after the shipment date. The Company records adjustments to revenues monthly based on quoted forward prices for the expected settlement period. Adjustments for weights and assays are recorded when results are determinable or on final settlement. Accounts receivable for metal concentrate sales are therefore measured at fair value.
Inventory	f) Inventory Finished goods and work-in-process Ore extracted from the mines is processed into finished goods (gold and by-products work-in-process work-in-process Supplies are measured at average cost. In the event that the net realizable value of the finished product, the production of which the supplies are held for use in, is lower than the expected cost of the finished product, the supplies are written down to net realizable value. Replacement costs of supplies are generally used as the best estimate of net realizable value. The costs of inventories sold during the year are presented in the Company’s profit and loss.
Mining Interest, Plant and Equipment	g) Mining Interest, Plant and Equipment Mining interests represent capitalized expenditures related to the development of mining properties and related plant and equipment. Recognition and Measurement On initial recognition, equipment is valued at cost, being the purchase price and directly attributable cost of acquisition or construction required to bring the asset to the location and condition necessary to be capable of operating in the manner intended by the Company, including appropriate borrowing costs and the estimated present value of any future unavoidable costs of dismantling and removing items. The corresponding liability is recognized within provisions. Mining expenditures incurred either to develop new ore bodies or to develop mine areas in advance of current production are capitalized. Mine development costs incurred to maintain current production are included in the consolidated statement of operations. Exploration costs relating to the current mine in production are expensed to net income as incurred due to the immediate exploitation of these areas or an immediate determination that they are not exploitable. Borrowing costs that are directly attributable to the acquisition and preparation for use, are capitalized. Capitalization of borrowing costs, begins when expenditures are incurred and activities are undertaken to prepare the asset for its intended use. The amount of borrowing costs capitalized cannot exceed the actual amount of borrowing costs incurred during the period. All other borrowing costs are expensed as incurred. The capitalization of borrowing costs is discontinued when substantially all of the activities necessary to prepare the qualifying asset for its intended use or sale are complete. Capitalized borrowing costs are amortized over the useful life of the related asset. Major Maintenance and Repairs Subsequent costs are included in the asset’s carrying amount or recognized as a separate asset, as appropriate, only when it is probable that the future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably. All other repairs and maintenance are charged to the Company’s profit or loss during the financial year in which they are incurred. Subsequent Costs The cost of replacing part of an item of equipment is recognized in the carrying amount of the item if it is probable that the future economic benefits embodied within the part will flow to the Company and its costs can be measured reliably. The carrying amount of the replaced part is derecognized. The costs of the day-to-day Leased Equipment Leased assets in which the Company receives substantially all of the risks and rewards of ownership of the asset are capitalized as finance leases at the lower of the fair value of the asset or the estimated present value of the minimum lease payments. The corresponding lease obligation is recorded within debt on the statement of financial position. Assets under operating leases are not capitalized and rental payments are included in earnings based on the terms of the lease. Derecognition Upon sale or abandonment, the cost of the property, plant, and equipment and related accumulated depreciation or depletion, are removed from the accounts and any gains or losses thereon are included in operations. Depreciation and Impairment Mining interest, plant and equipment are subsequently measured at cost less accumulated depreciation, less any accumulated impairment losses, with the exception of land which is not depreciated. Depletion of mine properties is charged on a unit-of-production The Company reviews and evaluates its mining interests, plant and equipment for impairment at least annually or when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Impairment is considered to exist if the recoverable value of a cash generating unit is less than the carrying amount of the assets. An impairment loss is measured and recorded based on the greater of the cash generating unit’s fair value less cost to sell or its value in use versus its carrying value. Future cash flows are estimated based on expected future production, commodity prices, operating costs and capital costs. Mining interests, plant and equipment that have been impaired in prior periods are tested for possible reversal of impairment whenever events or changes in circumstances indicate that the impairment has reversed. If the impairment has reversed, the carrying amount of the asset is increased to its recoverable amount but not beyond the carrying amount that would have been determined had no impairment loss been recognized for the asset in the prior periods. A reversal of an impairment loss is recognized in the consolidated statement of operations.
Rehabilitation and Closure Cost Provision	h) Rehabilitation and Closure Cost Provision The Company records a provision for the estimated future costs of rehabilitation and closure of operating and inactive mines and development projects, which are discounted to net present value using the risk free interest rates applicable to the future cash outflows. Estimates of future costs represent management’s best estimates which incorporate assumptions on the effects of inflation, movements in foreign exchange rates and the effects of country and other specific risks associated with the related liabilities. The provision for the Company’s rehabilitation and closure cost obligations is accreted over time to reflect the unwinding of the discount with the accretion expense included in finance costs in the Consolidated Statement of Operations and Comprehensive Income. The provision for rehabilitation and closure cost obligations is re-measured Rehabilitation and closure cost obligations relating to operating mines and development projects are initially recorded with a corresponding increase to the carrying amounts of related mining properties. Changes to the obligations are also accounted for as changes in the carrying amounts of related mining properties, except where a reduction in the obligation is greater than the capitalized rehabilitation and closure costs, in which case, the capitalized rehabilitation and closure costs is reduced to nil and the remaining adjustment is included in production costs in the Consolidated Statement of Operations and Comprehensive Income. Rehabilitation and closure cost obligations related to inactive mines are included in production costs in the Consolidated Statement of Operations and Comprehensive Income on initial recognition and subsequently when re-measured.
Exploration and Evaluation Expenditures	i) Exploration and Evaluation Expenditures Once the legal right to explore a property has been acquired, costs directly related to exploration and evaluation (“E&E”) expenditures are recognized and capitalized, in addition to the acquisition costs. These direct expenditures include such costs as materials used, surveying and sampling costs, drilling costs, payments made to contractors, geologists, consultants, and depreciation on plant and equipment during the exploration phase. Costs not directly attributable to E&E activities, including general and administrative overhead costs, are expensed in the period in which they occur. When a project is determined to no longer have commercially viable prospects to the Company, E&E expenditures in respect of that project are deemed to be impaired. As a result, those E&E expenditures, in excess of estimated recoveries, are written off to the Company’s profit or loss. The Company assesses E&E assets for impairment when facts and circumstances suggest that the carrying amount of an asset may exceed its recoverable amount. Once the technical feasibility and commercial viability of extracting the mineral resource has been determined, the property is considered to be a mine under development and is classified as “mines under construction”. E&E assets are tested for impairment before the assets are transferred to development properties. Any incidental revenues earned in connection with exploration activities are applied as a reduction to capitalized exploration costs.
Financial Instruments	j) Financial Instruments Financial instruments are classified as one of the categories below based upon the purpose for which the asset was acquired. All transactions related to financial instruments are recorded on a trade date basis. The Company’s accounting policy for each category is as follows: Loans and Receivables Loans and receivables are non-derivative Amortised cost is calculated taking into account any discount or premium on acquisition and includes fees that are an integral part of the effective interest rate and transaction costs. Gains and losses are recognized in the profit or loss when the loans and receivables are derecognized or impaired, as well as through the amortization process. The Company’s cash is accounted for at fair value and amounts receivable are all accounted for as loans and receivables. Available-for-Sale Non-derivative available-for-sale. Available-for-sale available-for-sale available-for-sale Purchases and sales of available-for-sale Impairment of Financial Assets At each reporting date, the Company assesses whether there is any objective evidence that a financial asset or a group of financial assets is impaired. A financial asset or group of financial assets is deemed to be impaired if, there is objective evidence of impairment as a result of one or more events that has occurred subsequent to the initial recognition of the asset and that event has an impact on the estimated future cash flows of the financial asset or the group of financial assets. Financial Liabilities Financial liabilities are classified as other financial liabilities, based on the purpose for which the liability was incurred, and comprised of trade and other payables, and loan payable. These liabilities are recognized at fair value, net of any transaction costs directly attributable to the issuance of the instrument and subsequently carried at amortised cost using the effective interest rate method. This ensures that, any interest expense over the period to repayment is at a constant rate on the balance of the liability carried in the statement of financial position. Interest expense in this context includes initial transaction costs and premiums payable on redemption, as well as any interest or coupon payable while the liability is outstanding. Trade and other payables & loan payable represent goods and services provided to the Company prior to the end of the period which are unpaid. Trade payable amounts are unsecured and are usually paid within 30 days of recognition. Fair value hierarchy Financial instruments recognized at fair value on the consolidated balance sheets must be classified into one of the three following fair value hierarchy levels: Level 1 – measurement based on quoted prices (unadjusted observed in active markets) for identical assets or liabilities; Level 2 – measurement based on inputs other than quoted prices included in Level 1, that are observable for the asset or liability; Level 3 – measurement based on inputs that are not observable (supported by little or no market activity) for the asset or liability. The Company’s financial instruments recognized at fair value consist of short term investments having a fair value of $Nil (2017 – $4,005) measured in accordance with Level 1.
Income Taxes	k) Income Taxes Current tax and deferred taxes are recognized in the Company’s profit or loss, except to the extent that it relates to a business combination or items recognized directly in equity or in other comprehensive loss/income. Current income taxes are recognized for the estimated taxes payable or receivable on taxable income or loss for the current year and any adjustment to income taxes payable in respect of previous years. Current income taxes are determined using tax rates and tax laws that have been enacted or substantively enacted by the period end date. Deferred tax assets and liabilities are recognized where the carrying amount of an asset or liability differs from its tax base, except for taxable temporary differences arising on the initial recognition of goodwill and temporary differences arising on the initial recognition of an asset or liability in a transaction which is not a business combination and at the time of the transaction affects neither accounting nor taxable profit or loss. Recognition of deferred tax assets for unused tax losses, tax credits and deductible temporary differences is restricted to those instances where it is probable that future taxable profit will be available against which the deferred tax asset can be utilised. At the end of each reporting period, the Company reassesses unrecognized deferred tax assets. The Company recognizes a previously unrecognized deferred tax asset to the extent that it has become probable that future taxable profit will allow the deferred tax asset to be recovered.
Share Capital	l) Share Capital Financial instruments issued by the Company are classified as equity, only to the extent that they do not meet the definition of a financial liability or asset. The Company’s common shares, share warrants and share options are classified as equity instruments. Incremental costs, directly attributable to the issue of new shares, warrants or options, are shown in equity as a deduction, net of tax, from proceeds.
Profit or Loss per Share	m) Profit or Loss per Share Basic profit or loss per share is computed by dividing the Company’s profit or loss applicable to common shares by the weighted average number of common shares outstanding for the relevant period. Diluted profit or loss per share is computed by dividing the Company’s profit or loss applicable to common shares, by the sum of the weighted average number of common shares outstanding and all additional common shares that would have been outstanding if potentially dilutive instruments were converted at the beginning of the period.
Share-based Payments	n) Share-based Payments Where equity-settled share options are awarded to employees or non-employees, Non-vesting non-vesting Where the terms and conditions of options are modified before they vest, the increase in the fair value of the options, measured immediately before and after the modifications, is charged to the Company’s profit or loss over the remaining vesting period. Where equity instruments are granted to employees, they are recorded at the fair value of the equity instrument granted at the grant date. The grant date fair value is recognized in the Company’s profit or loss over the vesting period, described as the period during which all the vesting conditions are to be satisfied. Where equity instruments are granted to non-employees, When the value of goods or services received in exchange for the share-based payment cannot be reliably estimated, the fair value is measured by use of a valuation model. The expected life used in the model is adjusted, based on management’s best estimate, for effects of non-transferability, All equity-settled share based payments are reflected in equity reserve, until exercised. Upon exercise, shares are issued from treasury and the amount reflected in equity reserve is credited to share capital, adjusted for any consideration paid. Where a grant of options is cancelled or settled during the vesting period, excluding forfeitures when vesting conditions are not satisfied, the Company immediately accounts for the cancellation as an acceleration of vesting and immediately recognizes the amount that otherwise would have been recognized for services received over the remainder of the vesting period. Any payment made to the employee on the cancellation is accounted for as the repurchase of an equity interest except to the extent that the payment exceeds the fair value of the equity instrument granted, measured at the repurchase date. Any such excess is recognized as an expense. Where vesting conditions are not satisfied and options are forfeited, the Company reverses the fair value amount of the unvested options which had been recognized over the vesting period.
New and Revised Accounting Standards	o) New and Revised Accounting Standards The following accounting standards have been issued or amended but are not yet effective. The Company has not early adopted these new and amended standards. The Company continues to evaluate the new standards but currently no material impact is expected as a result of the adoptions of these new and amended standards: • IFRS 3 “Business Combination” • IFRS 9 “Financial Instruments” • IFRS 10 “Consolidated Financial Statements” • IFRS 16 “Leases” • IAS 12 “Income Taxes” • IAS 23 “Borrowing Costs” • IAS 28 “Investments in Associates and Joint Ventures” • IFRIC 23 “Uncertainty over Income Tax treatments”

Amounts Receivable (Tables)

Amounts Receivable (Tables)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Summary of Amounts Receivables	April 30, April 30, Taxes receivable $ 1,941 $ 1,911 San Pedrito sale (note 8) 1,359 2,644 Trades receivable — 148 Other 48 74 $ 3,348 $ 4,777

Inventory (Tables)

Inventory (Tables)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Summary of Inventory	April 30, 2018 April 30, Carrying value of inventory: Doré $ 955 $ 922 Goods in transit 376 429 Work-in-process 662 377 Concentrate 595 189 Stockpile 118 196 Supplies 793 808 $ 3,499 $ 2,921

Mining Interest, Plant and Eq29

Mining Interest, Plant and Equipment (Tables)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Summary of Mining Interest, Plant and Equipment	Mining Plant and Plant and Corporate Total Cost Balance, April 30, 2016 $ 70,018 $ 20,308 $ 6,327 $ 605 $ 97,258 Additions 484 2,034 119 72 2,709 Write-down of equipment — (37 ) — — (37 ) Disposal of San Pedrito (5,249 ) — — — (5,249 ) Effect of foreign exchange 7,795 1,394 559 — 9,748 Balance, April 30, 2017 73,048 23,699 7,005 677 104,429 Additions 902 2,720 78 15 3,715 Write-down of equipment (5,000 ) (1,925 ) — — (6,925 ) Effect of foreign exchange (4,592 ) (1,318 ) (429 ) — (6,339 ) Balance, April 30, 2018 $ 64,358 $ 23,176 $ 6,654 $ 692 $ 94,880 Depreciation Balance, April 30, 2016 $ 31,781 $ 8,516 $ — $ 343 $ 40,640 Depreciation for the year 3,786 1,532 220 90 5,628 Effect of foreign exchange 4,090 1,142 8 — 5,240 Balance, April 30, 2017 39,657 11,190 228 433 51,508 Depreciation for the year 2,887 1,621 434 90 5,032 Write-down of equipment — (212 ) — — (212 ) Effect of foreign exchange (2,232 ) (680 ) (12 ) — (2,924 ) Balance, April 30, 2018 $ 40,312 $ 11,919 $ 650 $ 523 $ 53,404 Carrying amounts Balance, April 30, 2017 $ 33,391 $ 12,509 $ 6,777 $ 244 $ 52,921 Balance, April 30, 2018 $ 24,046 $ 11,257 $ 6,004 $ 169 $ 41,476
Summary of Details of Transaction	Details of the transaction are as follows: Total surface area sold covers 74.0831.544 hectares (740,831.544 square meters) sold at $250 pesos per square meter. Payments are staged as follows: Surface Area in hectares (ha) Equivalent in Mexican Pesos (4) Canadian (2)(4) Status 55.068 ha 550,685.485 sm MXN$ 137,671,371 C$ 9,640,852 Interest Received MXN$ 7,576,445 C$ 530,563 MXN$ 145,247,816 C$ 10,171,415 Payment received Parcel of 12 ha ( ¹ ) 120,000.000 sm MXN$ 30,000,000 C$ 2,100,840 Pending clearance Parcel of 2.014 ha (¹) 20,146.059 sm MXN$ 5,036,515 C$ 352,697 Pending clearance Parcel of 5 ha 50,000.000 sm MXN$ 12,500,000 C$ 832,731 (3) Payment received (1) The remaining two parcels await various confirmations from different local and federal authorities. As the Company receives these confirmations, the buyer will immediately remit the corresponding payment for each parcel of land. It is expected that these clearances will be confirmed within the next 6 months. (2) Based on exchange rate of 14.28 Pesos/CAD$ as at close of March 21, 2017. (3) Based on exchange rate of 15.01 Pesos/CAD$ on the actual date of collection on November 8, 2017. (4) Amounts are not rounded to the nearest thousand.

Exploration and Evaluation As30

Exploration and Evaluation Assets (Tables)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Summary of Exploration and Evaluation assets	AJC Creston Santa Fe Total Acquisition costs: Balance, April 30, 2016 $ 1,083 $ 2,001 $ — $ 3,084 Effect of foreign exchange 131 — — 131 Balance, April 30, 2017 1,214 2,001 — 3,215 Property disposition (970 ) — — (970 ) Recovery on disposal of E&E Asset (128 ) — — (128 ) Effect of foreign exchange (80 ) — — (80 ) Balance, April 30, 2018 36 2,001 — 2,037 Exploration costs: Balance, April 30, 2016 121 659 — 780 Assays 82 — — 82 Exploration cost 96 — — 96 Drilling 1,288 — — 1,288 Geological 178 139 — 317 Legal fees — 41 — 41 Maintenance 56 189 — 245 Effect of foreign exchange (109 ) — — (109 ) Balance, April 30, 2017 1,712 1,028 — 2,740 Exploration cost 23 — — 23 Drilling 18 — — 18 Geological 31 13 45 89 Legal fees — 15 — 15 Maintenance 62 274 — 336 Property disposition (37 ) — (45 ) (82 ) Effect of foreign exchange — 1 — 1 Balance, April 30, 2018 $ 1,809 $ 1,331 $ — $ 3,140 Total Exploration and Evaluation Assets Balance, April 30, 2017 $ 2,926 $ 3,029 $ — $ 5,955 Balance, April 30, 2018 $ 1,845 $ 3,332 $ — $ 5,177

Loan payable (Tables)

Loan payable (Tables)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Disclosure of loans repayable	Changes to the loan payable balance during the year ended April 30, 2018 and the year ended April 30, 2017, are as follows: Principal Interest Discount Total Balance, April 30, 2016 $ 5,754 $ 282 $ (48 ) $ 5,988 Repayment on debt (4,500 ) (538 ) 48 (4,990 ) Interest accrual — 536 — 536 Foreign exchange adjustment 112 — — 112 Balance, April 30, 2017 1,366 280 — 1,646 Financing, October 25, 2017 1,283 — — 1,283 Repayment on debt (1,213 ) (311 ) — (1,524 ) Interest accrual — 83 — 83 Foreign exchange adjustment (154 ) — — (154 ) Balance, April 30, 2018 $ 1,282 $ 52 $ — $ 1,334
Disclosure of Loans and Payables	April 30, 2018 April 30, 2017 Current $ — $ 1,646 Non-Current 1,334 — $ 1,334 $ 1,646
Disclosure of financing costs	The Company’s financing costs for the year ended April 30, 2018 and April 30, 2017 as reported on its Consolidated Statement of Operations and Comprehensive Income (Loss) can be summarized as follows: For the year ended April 30, 2018 2017 Unwinding of discount on rehabilitation and closure accretion (note 11) $ 64 $ 80 Discount unwinding on debt repaid — 48 Extension fee — 45 Interest expense on debt 83 536 Interest revenue (86 ) (83 ) $61 $626

Rehabilitation and Closure Co32

Rehabilitation and Closure Cost Provision (Tables)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Description of Changes to the reclamation	Changes to the reclamation and closure cost balance during the year are as follows: April 30, April 30, Balance, beginning of year $ 1,131 $ 1,091 Accretion expense 64 80 Foreign exchange fluctuation (33 ) (40 ) Balance, end of year $ 1,162 $ 1,131

Share Capital (Tables)

Share Capital (Tables)	12 Months Ended
	Apr. 30, 2018
Summary of Outstanding Share Price Warrants	A summary of the Company’s outstanding share purchase warrants at April 30, 2018 and 2017 and the changes during the year ended is presented below: Number of Weighted Outstanding at April 30, 2016 139,284 $ 1.20 Warrants expired (139,284 ) 1.20 Outstanding at April 30, 2017 — — Warrants issued 250,000 0.30 Outstanding at April 30, 2018 250,000 $ 0.30 A summary of the Company’s outstanding share purchase warrants is presented below: Number of Warrants Exercise Expiry Date 250,000 $ 0.30 March 7, 2022
Summary of Changes In Options	The following is a summary of changes in options for the years ending April 30, 2018 and 2017: Number of Weighted Average Balance at April 30, 2016 2,846,250 $ 1.07 Forfeited/expired (1,497,500 ) 1.23 Balance at April 30, 2017 1,348,750 0.90 Forfeited (400,000 ) 0.94 Outstanding and Exercisable at April 30, 2018 948,750 $ 0.88
Summary of Outstanding And Exercisable Options	The following is a summary of the Company’s outstanding and exercisable options at April 30, 2018: Number Outstanding Weighted Weighted 50,000 $ 1.00 0.37 50,000 $ 0.80 0.31 50,000 $ 0.92 0.35 798,750 $ 0.88 0.71 948,750 $ 0.88 0.65
DSU [member]
Summary of RSU And DSU Plan	The DSU share plan transactions during the period were as follows: Number of Share Outstanding at April 30, 2016 — Granted 760,000 Exercised (20,000 ) Cancelled (140,000 ) Outstanding at April 30, 2017 600,000 Granted 410,000 Outstanding at April 30, 2018 1,010,000
RSU [member]
Summary of RSU And DSU Plan	The RSU share plan transactions during the period were as follows: Number of Share Outstanding at April 30, 2016 — Granted 961,000 Cancelled (204,000 ) Outstanding at April 30, 2017 757,000 Granted 705,000 Exercised (178,750 ) Cancelled (42,000 ) Outstanding at April 30, 2018 1,241,250

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Apr. 30, 2018
Summary of Financial Assets And Liabilities	At April 30, 2018, the Company had the following financial assets and liabilities denominated in CAD and denominated in MXN$: In ‘000 of CAD MXN$ Cash $ 245 MP 8,305 Other working capital amounts—net $ (188 ) MP 44,441
Liquidity risk [member]
Summary of Obligations Due	Obligations due within twelve months 2018 2019 2020 2021 2022 and Trade and other payables $ 4,774 $ — $ — $ — $ — Current portion of loan payable — 1,334 — — — Reclamation and closure obligations $ — $ — $ — $ — $ 1,280

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Denominator for Calculation of Income (Loss) Per Share	The denominator for the calculation of income (loss) per share, being the weighted average number of shares, is calculated as follows: For the years ended April 30, 2018 April 30, 2017 Issued common share, beginning of year 49,146,851 49,146,851 Weighted average issuances 73,973 — Basic weighted average common shares 49,220,824 49,146,851 Effect of dilutive warrants and options — — Diluted weighted average common shares 49,220,824 49,146,851

Segmented Information (Tables)

Segmented Information (Tables)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Disclosure of Selected Financial Information by Geographical Segment	The Company operates in three reportable geographical and one operating segment. Selected financial information by geographical segment is as follows: Bernal Mexico Other Total Canada USA April 30, 2018 Revenue Mined Ore $ 21,005 $ — $ — $ 21,005 $ — $ — $ 21,005 Purchase Concentrate 3,976 2,826 — 6,802 — — 6,802 Cost of sales: Mined Ore (20,532 ) — (140 ) (20,672 ) — — (20,672 ) Purchase Concentrate (3,654 ) (3,496 ) — (7,150 ) — — (7,150 ) Depreciation (4,492 ) (421 ) — (4,913 ) — — (4,913 ) Earnings (loss) from operations (3,697 ) (1,091 ) (140 ) (4,928 ) — — (4,928 ) Corporate costs and taxes 4,343 294 (409 ) 4,228 (3,586 ) 12 654 Write off Mining Interest (6,713 ) — — (6,713 ) — — (6,713 ) Disposal of Exploration and Evaluation (1,079 ) — 118 (961 ) — (52 ) (1,013 ) Earnings (loss) for the year (7,145 ) (797 ) (432 ) (8,374 ) (3,586 ) (40 ) (12,000 ) Mining interest, plant and equipment 35,302 6,005 1 41,308 168 — 41,476 Total assets $ 48,614 $ 8,095 $ 3,930 $ 60,639 $ 3,537 $ 2,150 $ 66,326 Bernal Mexico Altiplano Total Canada USA April 30, 2017 Revenue Mined Ore $ 24,642 $ — $ 24,642 $ — $ — $ 24,642 Purchase Concentrate 418 2,168 2,586 — — 2,586 Cost of sales: Mined Ore (18,641 ) — (18,641 ) — — (18,641 ) Purchase Concentrate (287 ) (1,864 ) (2,151 ) — — (2,151 ) Depreciation (5,360 ) (250 ) (5,610 ) — — (5,610 ) Earnings (loss) from operations 772 54 826 — — 826 Corporate costs and taxes 3,302 (308 ) 2,994 (3,707 ) (19 ) (732 ) Sale of San Pedrito 7,128 — 7,128 — — 7,128 Earnings (loss) for the year 11,202 (254 ) 10,948 (3,707 ) (19 ) 7,222 Mining interest, plant and equipment 45,899 6,777 52,676 245 — 52,921 Total assets 61,401 11,165 72,566 7,559 1,971 82,096

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Summary of Earning Before Income Taxes	For the periods ended April 30, 2018 April 30, 2017 (Loss) Earnings before income taxes $ (17,945 ) $ 4,361 Income tax expense (recovery) at statutory rate (5,981 ) 1,134 Difference from higher statutory tax rates on earnings of foreign subsidiaries (917 ) — Permanent Difference — (1,286 ) Effect of Mexican mining royalty tax (SMD) on deferred income tax liabilities (375 ) (3,568 ) Recognition of previously unrecognized non-capital 1,328 859 Income tax (recovery) expense $ (5,945 ) $ (2,861 )
Summary of Significant Components of Deferred Income Tax Assets and Liabilities	The significant components of the Company’s deferred income tax assets and liabilities are as follows: April 30, 2018 April 30, 2017 Deferred income tax assets (liabilities): Mining interest, plant and equipment $ (4,235 ) $ (7,805 ) Payments to defer (172 ) (31 ) Insurance (14 ) (14 ) Reclamation and closure costs provision 956 1,018 Exploration assets (368 ) (346 ) Expenses reserve 255 146 Pension-fund reserve 200 121 Deferred mining tax (1,193 ) (1,670 ) Non-capital 5,316 4,682 Sale on San Pedrito — (2,138 ) Other (748 ) (723 ) Deferred income tax liabilities, net $ (3 ) $ (6,460 )

Corporate Information - Additio

Corporate Information - Additional Information (Detail)	12 Months Ended
	Apr. 30, 2018
Text block1 [abstract]
Name of reporting entity or other means of identification	Starcore International Mines Ltd.
Country of incorporation	Canada
Address of entity's registered office	Head office located at Suite 750 - 580 Hornby Street, Vancouver, British Columbia, V6C 3B6.
Description of nature of entity's operations and principal activities	Starcore is engaged in exploring, extracting and processing gold and silver through its wholly-owned subsidiaries, Compañia Minera Peña de Bernal, S.A. de C.V. (“Bernal”), which owns the San Martin mine in Queretaro, Mexico and Altiplano GoldSilver S.A. de C.V (“Altiplano”), which owns the gold and silver concentrate processing plant in Matehuala, Mexico. The Company is also engaged in acquiring mining related operating assets and exploration assets in North America directly and through corporate acquisitions.

Basis of Preparation - Addition

Basis of Preparation - Additional Information (Detail)	12 Months Ended
	Apr. 30, 2018
Basis Of Presentation [Abstract]
Date of authorisation for issue of financial statements	Jul. 27, 2018
Description of bases of financial statements that have been restated for changes in general purchasing power of functional currency	The consolidated financial statements have been prepared on a historical cost basis, except certain financial instruments, which are measured at fair value, as explained in the Company’s accounting policies discussed in note 3.

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Additional Information (Detail) - CAD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Basis Of Presentation [Abstract]
Cash and cash equivalents maturity period	3 months
Cash equivalents	$ 0	$ 0
Depletion base on expected production, years	10 years
Expected life of mine properties	10 years
Impairment loss	$ 0
Aggregate deemed cost of investments for which deemed cost is fair value	$ 0	$ 4,005,000

Critical Accounting Estimates41

Critical Accounting Estimates and Judgments - Additional Information (Detail)	Apr. 30, 2018
Disclosure of changes in accounting estimates [abstract]
Actuarial assumption of expected rates of inflation	3.50%
Percentage of reasonably possible decrease in actuarial assumption	8.00%

Short-term Investments - Additi

Short-term Investments - Additional Information (Detail) - Guaranteed Investment Certificate [member] - CAD ($)	Apr. 30, 2018	Apr. 30, 2017
United States of America, Dollars [member]
Disclosure of short-term investments [line items]
Market value	$ 0	$ 409,000
Mexico, Pesos [member]
Disclosure of short-term investments [line items]
Market value	$ 0	$ 3,596,000

Amounts Receivable - Summary of

Amounts Receivable - Summary of Amounts Receivables (Detail) - CAD ($) $ in Thousands	Apr. 30, 2018	Apr. 30, 2017
Disclosure of trade accounts receivables [line items]
Accounts receivable	$ 3,348	$ 4,777
Taxes receivable [member]
Disclosure of trade accounts receivables [line items]
Accounts receivable	1,941	1,911
San Pedrito sale receivable [member]
Disclosure of trade accounts receivables [line items]
Accounts receivable	1,359	2,644
Trade receivables [member]
Disclosure of trade accounts receivables [line items]
Accounts receivable	0	148
Other account receivable [member]
Disclosure of trade accounts receivables [line items]
Accounts receivable	$ 48	$ 74

Inventory - Summary of Inventor

Inventory - Summary of Inventory (Detail) - CAD ($) $ in Thousands	Apr. 30, 2018	Apr. 30, 2017
Inventories [abstract]
Dore	$ 955	$ 922
Goods in transit	376	429
Work-in-process	662	377
Concentrate	595	189
Stockpile	118	196
Supplies	793	808
Inventory	$ 3,499	$ 2,921

Mining Interest, Plant and Eq45

Mining Interest, Plant and Equipment - Summary of Mining Interest, Plant and Equipment (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 52,921
Write-down of equipment		$ (37)
Ending balance	41,476	52,921
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	104,429	97,258
Additions	3,715	2,709
Write-down of equipment	(6,925)	(37)
Disposal of San Pedrito		(5,249)
Effect of foreign exchange	(6,339)	9,748
Ending balance	94,880	104,429
Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(51,508)	(40,640)
Depreciation for the year	5,032	5,628
Write-down of equipment	(212)
Effect of foreign exchange	2,924	(5,240)
Ending balance	(53,404)	(51,508)
Mining Interests [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	33,391
Ending balance	24,046	33,391
Mining Interests [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	73,048	70,018
Additions	902	484
Write-down of equipment	(5,000)
Disposal of San Pedrito		(5,249)
Effect of foreign exchange	(4,592)	7,795
Ending balance	64,358	73,048
Mining Interests [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(39,657)	(31,781)
Depreciation for the year	2,887	3,786
Effect of foreign exchange	2,232	(4,090)
Ending balance	(40,312)	(39,657)
Plant and Equipment Mining [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	12,509
Ending balance	11,257	12,509
Plant and Equipment Mining [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	23,699	20,308
Additions	2,720	2,034
Write-down of equipment	(1,925)	(37)
Effect of foreign exchange	(1,318)	1,394
Ending balance	23,176	23,699
Plant and Equipment Mining [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(11,190)	(8,516)
Depreciation for the year	1,621	1,532
Write-down of equipment	(212)
Effect of foreign exchange	680	(1,142)
Ending balance	(11,919)	(11,190)
Plant and Equipment Altiplano [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	6,777
Ending balance	6,004	6,777
Plant and Equipment Altiplano [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	7,005	6,327
Additions	78	119
Effect of foreign exchange	(429)	559
Ending balance	6,654	7,005
Plant and Equipment Altiplano [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(228)
Depreciation for the year	434	220
Effect of foreign exchange	12	(8)
Ending balance	(650)	(228)
Office equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	244
Ending balance	169	244
Office equipment [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	677	605
Additions	15	72
Ending balance	692	677
Office equipment [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(433)	(343)
Depreciation for the year	90	90
Ending balance	$ (523)	$ (433)

Mining Interest, Plant and Eq46

Mining Interest, Plant and Equipment - Additional Information (Detail) $ in Thousands, $ in Millions	Mar. 21, 2017MXN ($)	Apr. 30, 2018CAD ($)m²	Apr. 30, 2018MXN ($)m²	Apr. 30, 2017CAD ($)	Apr. 30, 2016CAD ($)	Apr. 30, 2017USD ($)	Apr. 30, 2017MXN ($)	Aug. 05, 2015CAD ($)
Disclosure of detailed information about property, plant and equipment [line items]
Impairment		$ 6,713			$ 1,713
Gold price per ounce		1,300	1,300
Gold price discount rate		9.00%	9.00%
Surface area in hectares | m²		740,831.544	740,831.544
Payment of surface area sold			$ 250
Plant, machinery and equipment		$ 41,476		$ 52,921
San Martin Mine [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment		$ 5,000
Cortez Assets [member]
Disclosure of detailed information about property, plant and equipment [line items]
Plant, machinery and equipment								$ 6,094
United States of America, Dollars [member] | San Martin Mine [member]
Disclosure of detailed information about property, plant and equipment [line items]
Total consideration paid						$ 26
San Pedrito [member]
Disclosure of detailed information about property, plant and equipment [line items]
Sales price	$ 192,784,331
Gain on sale of San Pedrito				$ 7,128
San Pedrito [member] | Mexico, Pesos [member]
Disclosure of detailed information about property, plant and equipment [line items]
Allowance for uncertain collectability							$ 15,000,000

Mining Interest, Plant and Eq47

Mining Interest, Plant and Equipment - Summary of Details of Transaction (Detail) - 12 months ended Apr. 30, 2018	CAD ($)ham²	MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]
Surface area in hectares | m²	740,831.544
Stage Two [member]
Disclosure of detailed information about property, plant and equipment [line items]
Surface area in square meters | m²	120,000
Description of payment status	Pending clearance
Surface area in hectares | ha	12
Stage Three [member]
Disclosure of detailed information about property, plant and equipment [line items]
Surface area in square meters | m²	20,146.059
Description of payment status	Pending clearance
Surface area in hectares | ha	2.014
Stage Four [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Surface area in square meters | m²	50,000
Description of payment status	Payment received
Surface area in hectares | ha	5
Stage one [member]
Disclosure of detailed information about property, plant and equipment [line items]
Surface area in square meters | m²	550,685.485
Description of payment status	Payment received
Mexico, Pesos [member] | Stage Two [member]
Disclosure of detailed information about property, plant and equipment [line items]
Cash consideration from disposal		$ 30,000,000
Mexico, Pesos [member] | Stage Three [member]
Disclosure of detailed information about property, plant and equipment [line items]
Cash consideration from disposal		5,036,515
Mexico, Pesos [member] | Stage Four [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Cash consideration from disposal		12,500,000
Mexico, Pesos [member] | Stage one [member]
Disclosure of detailed information about property, plant and equipment [line items]
First parcel payment		137,671,371
Interest of the month		7,576,445
Cash consideration from disposal		$ 145,247,816
Canada, Dollars [member] | Stage Two [member]
Disclosure of detailed information about property, plant and equipment [line items]
Cash consideration from disposal	$ 2,100,840
Canada, Dollars [member] | Stage Three [member]
Disclosure of detailed information about property, plant and equipment [line items]
Cash consideration from disposal	352,697
Canada, Dollars [member] | Stage Four [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Cash consideration from disposal	832,731
Canada, Dollars [member] | Stage one [member]
Disclosure of detailed information about property, plant and equipment [line items]
First parcel payment	9,640,852
Interest of the month	530,563
Cash consideration from disposal	$ 10,171,415

Mining Interest, Plant and Eq48

Mining Interest, Plant and Equipment - Summary of Details of Transaction (Parenthetical) (Detail) - $ / CAD	Nov. 08, 2017	Mar. 21, 2017
San Pedrito [member]
Disclosure of detailed information about property, plant and equipment [line items]
Exchange rate	15.01	14.28

Exploration and Evaluation As49

Exploration and Evaluation Assets - Additional Information (Detail) $ in Thousands, $ in Thousands	Nov. 21, 2017ha	Dec. 31, 2017USD ($)	Apr. 30, 2018CAD ($)ham²	Apr. 30, 2018USD ($)ham²	Apr. 30, 2018USD ($)
Disclosure of exploration and corporate expenditure [line items]
Option to acquire criteria			Right to purchase up to one-halfof the NSR (or 1.5%) on the basis of USD $2,000 per each 1% of the royalty.	Right to purchase up to one-halfof the NSR (or 1.5%) on the basis of USD $2,000 per each 1% of the royalty.
Acquisition cost | m²			740,831.544	740,831.544
Loss on disposal of Exploration and Evaluation Asset			$ 1,013
Property investigation costs			$ 433
Lone Ranch [member]
Disclosure of exploration and corporate expenditure [line items]
Interests acquired		100.00%
Royalty acquired percentage		3.00%
Number of mining interest acquired		73
Consideration to be paid		$ 360
Exploration expenditures		1,225
exploration expenditures paid		$ 175
Option to acquire criteria			Right to purchase up to one-halfof the NSR (or 1.5%) on the basis of USD$1,500 per each 1% of the royalty.	Right to purchase up to one-halfof the NSR (or 1.5%) on the basis of USD$1,500 per each 1% of the royalty.
Purchase right to net smelter return percentage			1.50%	1.50%
Purchase right to net smelter return bases				$ 1,500
Purchase right to net smelter return bases percentage			1.00%	1.00%
Lone Ranch [member] | Exploration and evaluation assets [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration payment period			5 years	5 years
Consideration payment commencing date			Oct. 19, 2018	Oct. 19, 2018
Lone Ranch [member] | 2018 [member] | Exploration and evaluation assets [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			$ 60
Lone Ranch [member] | 2019 [member] | Exploration and evaluation assets [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			80
Lone Ranch [member] | 2019 [member] | Exploration and evaluation assets [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			100
Lone Ranch [member] | 2020 [member] | Exploration and evaluation assets [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			170
Lone Ranch [member] | 2021 [member] | Exploration and evaluation assets [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			$ 0
Toiyabe [member]
Disclosure of exploration and corporate expenditure [line items]
Interests acquired			100.00%		100.00%
Royalty acquired percentage			3.00%	3.00%
Number of mining interest acquired			165	165
Consideration to be paid					$ 900
Exploration expenditures				$ 1,025
Consideration payment period			5 years	5 years
Consideration payment commencing date			Oct. 19, 2018	Oct. 19, 2018
Purchase right to net smelter return percentage			1.50%	1.50%
Purchase right to net smelter return bases				$ 2,000
Purchase right to net smelter return bases percentage			1.00%	1.00%
Toiyabe [member] | 2018 [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			$ 60
Toiyabe [member] | 2019 [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			80
Toiyabe [member] | 2020 [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			100
Toiyabe [member] | 2021 [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			120
Toiyabe [member] | 2022 [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			140
Toiyabe [member] | 2023 [member]
Disclosure of exploration and corporate expenditure [line items]
Consideration to be paid			$ 400
Sierra Rosario [member]
Disclosure of exploration and corporate expenditure [line items]
Interests acquired			100.00%		100.00%
Number of mining interest acquired			2	2
Acquisition cost | ha			978	978
Number of mining interest acquired			Acquired a 100% interest in the 978-hectare Sierra Rosario Property, over 2 claims that are located in the state of Sinaloa, Mexico ("Sierra Rosario").	Acquired a 100% interest in the 978-hectare Sierra Rosario Property, over 2 claims that are located in the state of Sinaloa, Mexico ("Sierra Rosario").
Sales price			$ 128	$ 100
Loss on disposal of Exploration and Evaluation Asset			$ 1,013
El Creston Project [member]
Disclosure of exploration and corporate expenditure [line items]
Interests acquired			100.00%		100.00%
Royalty acquired percentage			3.00%	3.00%
Number of mining interest acquired			9	9
Ajax Project [member]
Disclosure of exploration and corporate expenditure [line items]
Interests acquired			100.00%		100.00%
Number of mining interest acquired			6	6
Molybrook Project [member]
Disclosure of exploration and corporate expenditure [line items]
Interests acquired			100.00%		100.00%
Number of mining interest acquired			44	44
Purchase right to net smelter return percentage			2.00%	2.00%
Purchase right to net smelter return bases			$ 1,500
Purchase right to net smelter return bases percentage			1.50%	1.50%
Santa Fe Property [member]
Disclosure of exploration and corporate expenditure [line items]
Acquisition cost | ha	21,000

Exploration and Evaluation As50

Exploration and Evaluation Assets - Disclosure of Reduced Claims to Focus of the Core Project And to Reduce its Holding Costs (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Disclosure of exploration and corporate expenditure [line items]
Ending balance	$ 5,177	$ 5,955
Acquisition Cost [member]
Disclosure of exploration and corporate expenditure [line items]
Acquisition costs, beginning balance	3,215	3,084
Recovery on disposal of E&E Asset	(128)
Property disposition	(970)
Acquisition costs, ending balance	2,037	3,215
Effect of foreign exchange	(80)	131
Exploration and evaluation assets [member]
Disclosure of exploration and corporate expenditure [line items]
Maintenance	336	245
Legal fees	15	41
Geological	89	317
Drilling	18	1,288
Property disposition	(82)
Exploration cost	23	96
Exploration costs, beginning balance	2,740	780
Assays		82
Effect of foreign exchange	1	(109)
Exploration costs, ending balance	3,140	2,740
AJC Properties [member]
Disclosure of exploration and corporate expenditure [line items]
Ending balance	1,845	2,926
AJC Properties [member] | Acquisition Cost [member]
Disclosure of exploration and corporate expenditure [line items]
Acquisition costs, beginning balance	1,214	1,083
Recovery on disposal of E&E Asset	(128)
Property disposition	(970)
Acquisition costs, ending balance	36	1,214
Effect of foreign exchange	(80)	131
AJC Properties [member] | Exploration and evaluation assets [member]
Disclosure of exploration and corporate expenditure [line items]
Maintenance	62	56
Geological	31	178
Drilling	18	1,288
Property disposition	(37)
Exploration cost	23	96
Exploration costs, beginning balance	1,712	121
Assays		82
Effect of foreign exchange		(109)
Exploration costs, ending balance	1,809	1,712
El Creston Project [member]
Disclosure of exploration and corporate expenditure [line items]
Ending balance	3,332	3,029
El Creston Project [member] | Acquisition Cost [member]
Disclosure of exploration and corporate expenditure [line items]
Acquisition costs, beginning balance	2,001	2,001
Acquisition costs, ending balance	2,001	2,001
El Creston Project [member] | Exploration and evaluation assets [member]
Disclosure of exploration and corporate expenditure [line items]
Maintenance	274	189
Legal fees	15	41
Geological	13	139
Exploration costs, beginning balance	1,028	659
Effect of foreign exchange	1
Exploration costs, ending balance	1,331	$ 1,028
Santa Fe Property [member] | Exploration and evaluation assets [member]
Disclosure of exploration and corporate expenditure [line items]
Geological	45
Property disposition	$ (45)

Loan Payable - Additional Infor

Loan Payable - Additional Information (Detail) $ in Thousands	Apr. 12, 2017CAD ($)	Apr. 30, 2018CAD ($)	Apr. 30, 2017CAD ($)	Jun. 18, 2018CAD ($)	May 01, 2018CAD ($)	Apr. 30, 2018USD ($)	Nov. 17, 2015CAD ($)	Jul. 31, 2015CAD ($)	Jul. 31, 2015USD ($)
Loans and advances to banks repayable [line Items]
Secured loan		$ 1,334,000						$ 1,305,000	$ 1,000
Repayment of principal		1,213,000
Accrued interest		83,000	$ 536,000
Repayment on debt		1,524,000	$ 4,990,000
Bonds issued		$ 1,283,000				$ 1,000
Secured loan interest		8.00%
Bonds issued		$ 1,283,000
Private Placements [member]
Loans and advances to banks repayable [line Items]
Bonds issued				$ 3,000	$ 3,000		$ 4,500
Interest rate percentage of bonds				8.00%			8.00%
Early repayment of bonds in aggregate principal amount	$ 4,500,000

Loan Payable - Disclosure of Lo

Loan Payable - Disclosure of Loans Repayable (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Loans and advances to banks repayable [line Items]
beginning Balance	$ 1,646	$ 5,988
Financing, October 25, 2017	1,283
Repayment on debt	(1,524)	(4,990)
Interest accrual	83	536
Foreign exchange adjustment	(154)	112
Ending Balance	1,334	1,646
Ending Balance	1,334	1,646
Principal [member]
Loans and advances to banks repayable [line Items]
beginning Balance	1,366	5,754
Financing, October 25, 2017	1,283
Repayment on debt	(1,213)	(4,500)
Foreign exchange adjustment	(154)	112
Ending Balance	1,282	1,366
Ending Balance	1,282	1,366
Interest [member]
Loans and advances to banks repayable [line Items]
beginning Balance	280	282
Repayment on debt	(311)	(538)
Interest accrual	83	536
Ending Balance	52	280
Ending Balance	$ 52	280
Discount [member]
Loans and advances to banks repayable [line Items]
beginning Balance		(48)
Repayment on debt		$ 48

Loan Payable - Disclosure of 53

Loan Payable - Disclosure of Loans and Payables (Detail) $ in Thousands, $ in Thousands	Apr. 30, 2018CAD ($)	Apr. 30, 2017CAD ($)	Apr. 30, 2016CAD ($)	Jul. 31, 2015CAD ($)	Jul. 31, 2015USD ($)
Disclosure Of Loans And Borrowings [Abstract]
Current	$ 1,334	$ 1,646	$ 5,988
Non-Current	1,334			$ 1,305	$ 1,000
Total	$ 1,334	$ 1,646

Loan Payable - Disclosure of Fi

Loan Payable - Disclosure of Financing Costs (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Disclosure of interest and financing cost [abstract]
Unwinding of discount on rehabilitation and closure accretion (note 11)	$ 64	$ 80
Discount unwinding on debt repaid		48
Extension fee		45
Interest expense on debt	83	536
Interest revenue	(86)	(83)
Finance Costs Total	$ 61	$ 626

Rehabilitation and Closure Co55

Rehabilitation and Closure Cost Provision - Additional Information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2018CAD ($)	Apr. 30, 2018MXN ($)	Apr. 30, 2017CAD ($)	Apr. 30, 2016CAD ($)
Disclosure of number and weighted average exercise price of outstanding other equity instruments [line items]
Rehabilitation expenses	$ 1,162		$ 1,131	$ 1,091
Decommissioning rehabilitation costs	$ 1,280	$ 18,729	$ 1,347
Discount rate	8.00%	8.00%	8.00%
Inflation rate	3.50%	3.50%	3.50%
Bottom of range [member]
Disclosure of number and weighted average exercise price of outstanding other equity instruments [line items]
Mine life	5 years	5 years
Top of range [member]
Disclosure of number and weighted average exercise price of outstanding other equity instruments [line items]
Mine life	10 years	10 years

Rehabilitation and Closure Co56

Rehabilitation and Closure Cost Provision - Description of Changes to the Reclamation (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Description Of Closure And Rehabilitation Provisions [Abstract]
Beginning balance	$ 1,131	$ 1,091
Accretion expense	64	80
Foreign exchange fluctuation	(33)	(40)
Ending balance	$ 1,162	$ 1,131

Share Capital - Additional Info

Share Capital - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Apr. 30, 2018CAD ($)yr$ / sharesshares	Aug. 01, 2017shares	Apr. 30, 2017shares
Disclosure of classes of share capital [line items]
Shares issued | shares	49,146,851		49,146,851
Share value | $ / shares	$ 0.25
Gross proceeds from shares issued	$ 125
Transferable common share purchase warrant	1.5
Common stock warrant exercisable period	4 years
Common stock warrant exercisable price per share	0.30
Market price per share | $ / shares	$ 0.24
Offering price per share | $ / shares	$ 0.25
Market price of share	$ 120
Difference in fair value of warrants	5
Increase in share capital	120
Increase in equity reserve	$ 5
Grant options percentage	20.00%
Life share options granted | yr	3
Shares exercised for a fair value | $ / shares	$ 0.195
Reduced the liability share based payment	$ 136
Officers and Directors [member]
Disclosure of classes of share capital [line items]
Shares issued | shares	500,000
RSU [member]
Disclosure of classes of share capital [line items]
Vesting period from date of grant	3 years
Vesting portion of each calendar year	One-third
Vesting percentage	50.00%
Fair value per share | $ / shares	$ 0.195
Expense from sharebased payment	$ 70
DSU [member] | Directors [member]
Disclosure of classes of share capital [line items]
Number of shares granted | shares		410,000

Share Capital - Summary of Outs

Share Capital - Summary of Outstanding Share Price Warrants (Detail) - $ / shares	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Disclosure Of Outstanding Warrants Per Category Of Warrant Holders [Abstract]
Outstanding beginning balance, shares	139,284
Warrants expired, shares	(139,284)
Warrants issued	250,000	250,000
Outstanding ending balance, shares	250,000	139,284
Weighted average exercise price, Beginning balance	$ 1.20
Weighted average exercise price, Warrants expired	1.20
Warrants issued	0.30	$ 0.30
Weighted average exercise price, ending balance	$ 0.30	$ 1.20
Expiry Date		Mar. 7, 2022

Share Capital - Summary of Chan

Share Capital - Summary of Changes In Options (Detail)	12 Months Ended
	Apr. 30, 2018CAD ($)OptionOptions	Apr. 30, 2017CAD ($)Option
Disclosure of defined benefit plans [abstract]
Beginning balance, shares | Option	1,348,750	2,846,250
Forfeited/expired , shares | Option	(400,000)	(1,497,500)
Ending balance, shares	948,750	1,348,750
Weighted average exercise price, Outstanding and Exercisable beginning balance	$ 0.90	$ 1.07
Weighted average exercise price, Forfeited/expired	0.94	1.23
Weighted average exercise price, Outstanding and Exercisable ending balance	$ 0.88	$ 0.90

Share Capital - Summary of Ou60

Share Capital - Summary of Outstanding And Exercisable Options (Detail)	12 Months Ended
	Apr. 30, 2018CAD ($)Optionsyr	Apr. 30, 2017Option	Apr. 30, 2016Option
Disclosure of range of exercise prices of outstanding share options [line items]
Number Outstanding	948,750	1,348,750	2,846,250
Weighted Average Exercise Price | $	$ 0.88
Weighted Average Life | yr	0.65
Range one [member]
Disclosure of range of exercise prices of outstanding share options [line items]
Number Outstanding | Options	50,000
Weighted Average Exercise Price | $	$ 1
Weighted Average Life | yr	0.37
Range two [member]
Disclosure of range of exercise prices of outstanding share options [line items]
Number Outstanding | Options	50,000
Weighted Average Exercise Price | $	$ 0.80
Weighted Average Life | yr	0.31
Range Three [Member]
Disclosure of range of exercise prices of outstanding share options [line items]
Number Outstanding | Options	50,000
Weighted Average Exercise Price | $	$ 0.92
Weighted Average Life | yr	0.35
Range Four [Member]
Disclosure of range of exercise prices of outstanding share options [line items]
Number Outstanding | Options	798,750
Weighted Average Exercise Price | $	$ 0.88
Weighted Average Life | yr	0.71

Share Capital - Summary of RSU

Share Capital - Summary of RSU And DSU Plan (Detail)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
RSU [member]
Disclosure of number of outstanding share options [line items]
Beginning balance	757,000
Granted	705,000	961,000
Exercised	(178,750)
Cancelled	(42,000)	(204,000)
Ending balance	1,241,250	757,000
DSU [member]
Disclosure of number of outstanding share options [line items]
Beginning balance	600,000
Granted	410,000	760,000
Exercised		(20,000)
Cancelled		(140,000)
Ending balance	1,010,000	600,000

Financial Instruments - Summary

Financial Instruments - Summary of Financial Assets And Liabilities (Detail) - Apr. 30, 2018 - Currency risk [member] $ in Thousands, $ in Thousands	CAD ($)	MXN ($)
Cash [member]
Disclosure of carrying amounts and fair values of financial assets and financial liabilities [line items]
Cash	$ 245	$ 8,305
Other Working Capital [member]
Disclosure of carrying amounts and fair values of financial assets and financial liabilities [line items]
Other working capital amounts-net	$ (188)	$ 44,441

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) $ in Thousands	12 Months Ended
	Apr. 30, 2018CAD ($)$ / $$ / $	Apr. 30, 2018MXN ($)$ / $$ / $	Apr. 30, 2017CAD ($)	Apr. 30, 2016CAD ($)
Disclosure of financial assets [line items]
Cash	$ 2,321,000		$ 5,558,000	$ 4,248,000
Currency risk [member]
Disclosure of financial assets [line items]
Increase or decrease exchange rate	10.00%	10.00%
Decrease or increase annual earnings	$ 1,996,000	$ 487
Currency risk [member] | Canada, Dollars [member]
Disclosure of financial assets [line items]
Conversion rate per dollar | $ / $	1.2821	1.2821
Currency risk [member] | Mexico, Pesos [member]
Disclosure of financial assets [line items]
Conversion rate per dollar | $ / $	18.7800	18.7800
Credit risk [member]
Disclosure of financial assets [line items]
Cash	$ 2,321,000		5,558,000
Short-term investments	0		4,005,000
VAT receivable	1,907,000
GST receivable	34,000
Amount owed from the sale	1,359,000
Credit risk [member] | Mexico [member]
Disclosure of financial assets [line items]
Cash	974,000		1,982,000
Short-term investments	0		3,596,000
Credit risk [member] | United States [member]
Disclosure of financial assets [line items]
Cash	23,000		3,000
Short-term investments	1,324,000		3,573,000
Credit risk [member] | Canada [member]
Disclosure of financial assets [line items]
Short-term investments	0		409,000
Liquidity risk [member]
Disclosure of financial assets [line items]
Cash	2,321,000		5,558,000
Short-term investments	0		$ 4,005,000
Commodity price risk [member]
Disclosure of financial assets [line items]
Decrease or increase in net income	$ 2,781,000
Decrease or increase in metal prices	10.00%

Financial Instruments - Summa64

Financial Instruments - Summary of Obligations Due (Detail) - Liquidity risk [member] $ in Thousands	Apr. 30, 2018CAD ($)
2018 [member]
Disclosure of reclamation obligations continuity [line items]
Trade and other payables	$ 4,774
2019 [member]
Disclosure of reclamation obligations continuity [line items]
Current portion of loan payable	1,334
2022 and beyond [member]
Disclosure of reclamation obligations continuity [line items]
Reclamation and closure obligations	$ 1,280

Commitments and related party65

Commitments and related party transactions - Additional Information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2018CAD ($)	Apr. 30, 2018USD ($)
Disclosure of transactions between related parties [line items]
Lease commitments	$ 144
Term expiration date	Apr. 30, 2018	Apr. 30, 2018
Lease agreement commitment	$ 132
Exploration and evaluation	220
Management contract expiring in January 2020 [member]
Disclosure of transactions between related parties [line items]
Directors remuneration	$ 600
Management contract expiration team	January 2,020	January 2,020
Management contract expiring in August 2021 [member]
Disclosure of transactions between related parties [line items]
Directors remuneration		$ 315
Management contract expiration team	August 2,021	August 2,021

Commitments and related party66

Commitments and related party transactions - Summary of Payment to Key Management And Directors (Detail) - Key management and executive director [member] - CAD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Disclosure of transactions between related parties [line items]
Management fees	$ 1,112	$ 958
Legal fees	64	116
Directors fees	86	187
Total	$ 1,262	$ 1,261

Earnings Per Share - Denominato

Earnings Per Share - Denominator for Calculation of Income (Loss) Per Share (Detail) - shares	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract]
Issued common share, beginning of year	49,146,851	49,146,851
Weighted average issuances	73,973
Basic weighted average common shares	49,220,824	49,146,851
Effect of dilutive warrants and options	0	0
Diluted weighted average common shares	49,220,824	49,146,851

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Earnings per share [abstract]
Anti-dilutive vested share purchase options	948,750	1,348,750
Anti-dilutive vested share purchase warrants	250,000	0

Segmented Information - Additio

Segmented Information - Additional Information (Detail)	12 Months Ended
	Apr. 30, 2018CAD ($)Segments	Apr. 30, 2017CAD ($)
Disclosure of operating segments [abstract]
Number of reportable geographical segment	3
Number of operating segment	1
Trade receivables | $	$ 0	$ 148,000

Segmented Information - Disclos

Segmented Information - Disclosure of Selected Financial Information by Geographical Segment (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Revenue
Mined Ore	$ 21,005	$ 24,642
Purchase Concentrate	6,802	2,586
Cost of sales:
Mined Ore	(20,672)	(18,641)
Purchase Concentrate	(7,150)	(2,151)
Depreciation	(4,913)	(5,610)
Earnings (Loss) from operations	(4,928)	826
Corporate costs and taxes	654	(732)
Write off Mining Interest	(6,713)		$ (1,713)
Disposal of Exploration and Evaluation	(1,013)	7,128
Earnings (Loss) for the year	(12,000)	7,222
Mining interest, plant and equipment	41,476	52,921
Total assets	64,451	82,096
Mexico [member]
Revenue
Mined Ore	21,005	24,642
Purchase Concentrate	6,802	2,586
Cost of sales:
Mined Ore	(20,672)	(18,641)
Purchase Concentrate	(7,150)	(2,151)
Depreciation	(4,913)	(5,610)
Earnings (Loss) from operations	(4,928)	826
Corporate costs and taxes	4,228	2,994
Write off Mining Interest	(6,713)
Disposal of Exploration and Evaluation	(961)	7,128
Earnings (Loss) for the year	(8,374)	10,948
Mining interest, plant and equipment	41,308	52,676
Total assets	60,639	72,566
Mexico [member] | Bernal [member]
Revenue
Mined Ore	21,005	24,642
Purchase Concentrate	3,976	418
Cost of sales:
Mined Ore	(20,532)	(18,641)
Purchase Concentrate	(3,654)	(287)
Depreciation	(4,492)	(5,360)
Earnings (Loss) from operations	(3,697)	772
Corporate costs and taxes	4,343	3,302
Write off Mining Interest	(6,713)
Disposal of Exploration and Evaluation	(1,079)	7,128
Earnings (Loss) for the year	(7,145)	11,202
Mining interest, plant and equipment	35,302	45,899
Total assets	48,614	61,401
Mexico [member] | Altiplano [member]
Revenue
Purchase Concentrate	2,826	2,168
Cost of sales:
Purchase Concentrate	(3,496)	(1,864)
Depreciation	(421)	(250)
Earnings (Loss) from operations	(1,091)	54
Corporate costs and taxes	294	(308)
Earnings (Loss) for the year	(797)	(254)
Mining interest, plant and equipment	6,005	6,777
Total assets	8,095	11,165
Mexico [member] | Other [member]
Cost of sales:
Mined Ore	(140)
Earnings (Loss) from operations	(140)
Corporate costs and taxes	(409)
Disposal of Exploration and Evaluation	118
Earnings (Loss) for the year	(432)
Mining interest, plant and equipment	1
Total assets	3,930
Canada [member]
Cost of sales:
Corporate costs and taxes	(3,586)	(3,707)
Earnings (Loss) for the year	(3,586)	(3,707)
Mining interest, plant and equipment	168	245
Total assets	3,537	7,559
United States [member]
Cost of sales:
Corporate costs and taxes	12	(19)
Disposal of Exploration and Evaluation	(52)
Earnings (Loss) for the year	(40)	(19)
Total assets	$ 2,150	$ 1,971

Income Taxes - Summary of Earni

Income Taxes - Summary of Earning Before Income Taxes (Detail) - CAD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Disclosure of reconciliation of effective tax rate [Abstract
(Loss) Earnings before income taxes	$ (17,945)	$ 4,361
Income tax expense (recovery) at statutory rate	(5,981)	1,134
Difference from higher statutory tax rates on earnings of foreign subsidiaries	(917)
Permanent Difference		(1,286)
Effect of Mexican mining royalty tax (SMD) on deferred income tax liabilities	(375)	(3,568)
Recognition of previously unrecognized non-capital loss carry forward and other deductible tax benefits	1,328	859
Income tax (recovery) expense	$ (5,945)	$ (2,861)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	1 Months Ended		12 Months Ended
	Oct. 26, 2017	Sep. 30, 2017	Dec. 31, 2013
Disclosure of reconciliation of effective tax rate [Line Items]
Statutory income tax rate	27.00%	26.00%
General corporate income tax rate	12.00%	11.00%
Mexico [member]
Disclosure of reconciliation of effective tax rate [Line Items]
Special mining duty relating to tax reform			7.50%
Extraordinary mining duty relating to tax reform			0.50%

Income Taxes - Summary of Signi

Income Taxes - Summary of Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - CAD ($) $ in Thousands	Apr. 30, 2018	Apr. 30, 2017
Deferred income tax assets (liabilities):
Deferred tax liability asset	$ (3)	$ (6,460)
Net deferred tax assets	30,077	24,637
Mining interest property plant and equipment [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset	(4,235)	(7,805)
Payments to defer [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset	(172)	(31)
Insurance [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset	(14)	(14)
Reclamation and closure cost obligations [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset	956	1,018
Exploration and evaluation assets [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset	(368)	(346)
Expenses reserve [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset	255	146
Pension fund reserve [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset	200	121
Deferred mining taxes [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset	(1,193)	(1,670)
Non-capital losses and other deductible tax benefits [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset	5,316	4,682
Sale of property [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset		(2,138)
Others [member]
Deferred income tax assets (liabilities):
Deferred tax liability asset	(748)	(723)
Non-capital Losses [Member]
Deferred income tax assets (liabilities):
Net deferred tax assets	7,580	19,375
Property, plant and equipment [member]
Deferred income tax assets (liabilities):
Net deferred tax assets		1,585
Exploration and evaluation assets [member]
Deferred income tax assets (liabilities):
Net deferred tax assets	$ 22,497	$ 30,077

Subsequent Event - Additional I

Subsequent Event - Additional Information (Detail) - CAD ($)	Jun. 18, 2018	Apr. 30, 2018	Apr. 30, 2017	May 01, 2018	Nov. 17, 2015
Disclosure of Events After Reporting Period [Line Items]
Bonds issued		$ 1,283,000
Warrants issued		250,000	250,000
Warrants expiration date			Mar. 7, 2022
Private Placements [member]
Disclosure of Events After Reporting Period [Line Items]
Bonds issued	$ 3,000			$ 3,000	$ 4,500
Interest rate percentage of bonds	8.00%				8.00%
Maturity period	Jun. 18, 2020
Toronto Stock Exchange [member]
Disclosure of Events After Reporting Period [Line Items]
Warrants issued	3,000,000
Exercise price of warrants issued	$ 0.20
Warrants expiration date	Jun. 18, 2021