$MUX
McEwen Mining Inc. Stock $mux

$mux Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000155837021002708 Filed on March 10, 2021

Income Statement

Concept	2020 Q4	2019 Q4	2019 Q3
Revenue	$27.70M	$32.36M	$32.69M
YoY Change	-14.4%	22.44%	21.55%
Cost Of Revenue	$41.39M	$31.10M	$31.07M
YoY Change	33.09%	31.33%	48.8%
Gross Profit	-$13.69M	$1.261M	$1.619M
YoY Change	-1185.41%	-54.13%	-73.08%
Gross Profit Margin	-49.41%	3.9%	4.95%
Selling, General & Admin	$4.580M	$7.350M	$4.790M
YoY Change	-37.69%	6.83%	-35.44%
% of Gross Profit		582.87%	295.86%
Research & Development	$4.100M	$14.03M	$13.70M
YoY Change	-70.78%	104.52%	66.46%
% of Gross Profit		1112.61%	846.2%
Depreciation & Amortization	$6.860M	$150.0K	$100.0K
YoY Change	4473.33%	-44.44%	-64.29%
% of Gross Profit		11.9%	6.18%
Operating Expenses	$8.550M	$23.67M	$19.07M
YoY Change	-63.88%	42.85%	17.35%
Operating Profit	-$22.24M	-$22.41M	-$17.78M
YoY Change	-0.77%	62.14%	16.93%
Interest Expense	-$2.520M	-$2.130M	$4.190M
YoY Change	18.31%	213.24%	1296.67%
% of Operating Profit
Other Income/Expense, Net	$380.0K	-$20.00K	$4.123M
YoY Change	-2000.0%	-60.0%	1260.73%
Pretax Income	-$23.66M	-$26.40M	-$13.66M
YoY Change	-10.38%	39.9%	-8.36%
Income Tax	-$110.0K	-$1.270M	-$2.192M
% Of Pretax Income
Net Earnings	-$23.54M	-$25.13M	-$11.47M
YoY Change	-6.33%	19.74%	-13.73%
Net Earnings / Revenue	-84.99%	-77.66%	-35.07%
Basic Earnings Per Share
Diluted Earnings Per Share	-$57.55K	-$66.35K	-$31.67K
COMMON SHARES
Basic Shares Outstanding	408.8M	362.5M	362.2M
Diluted Shares Outstanding			362.2M

Balance Sheet

Concept	2020 Q4	2019 Q4	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$20.80M	$48.30M	$7.500M
YoY Change	-56.94%	155.56%	-82.95%
Cash & Equivalents	$20.84M	$46.45M	$4.262M
Short-Term Investments		$1.900M	$3.200M
Other Short-Term Assets	$3.900M	$2.607M	$2.872M
YoY Change	49.6%	54.63%
Inventory	$26.96M	$38.38M	$34.37M
Prepaid Expenses
Receivables		$5.300M
Other Receivables		$0.00
Total Short-Term Assets	$53.50M	$91.98M	$56.89M
YoY Change	-41.84%	54.91%	-26.88%
LONG-TERM ASSETS
Property, Plant & Equipment	$48.99M	$107.6M	$424.8M
YoY Change	-54.45%	-6.24%	5.5%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$108.3M	$110.2M	$117.0M
YoY Change	-1.72%	-13.77%	-12.23%
Other Assets	$621.0K	$620.0K	$757.0K
YoY Change	0.16%	-51.6%	-89.03%
Total Long-Term Assets	$446.4M	$539.2M	$550.3M
YoY Change	-17.21%	-3.29%	1.39%
TOTAL ASSETS
Total Short-Term Assets	$53.50M	$91.98M	$56.89M
Total Long-Term Assets	$446.4M	$539.2M	$550.3M
Total Assets	$499.9M	$631.2M	$607.2M
YoY Change	-20.8%	2.31%	-2.16%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$36.10M	$34.10M	$32.10M
YoY Change	5.87%	10.71%	-14.63%
Accrued Expenses	$2.400M	$2.100M	$2.000M
YoY Change	14.29%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$5.000M	$2.000M
YoY Change	-100.0%
Long-Term Debt Due	$0.00	$10.00M	$4.000M
YoY Change	-100.0%	566.67%	300.0%
Total Short-Term Liabilities	$45.55M	$48.80M	$40.43M
YoY Change	-6.64%	35.5%	1.33%
LONG-TERM LIABILITIES
Long-Term Debt	$48.16M	$39.50M	$45.40M
YoY Change	21.92%	-26.99%	-13.03%
Other Long-Term Liabilities	$3.257M	$3.910M	$4.018M
YoY Change	-16.7%	-32.18%	-85.95%
Total Long-Term Liabilities	$51.42M	$3.910M	$4.018M
YoY Change	1215.01%	-32.18%	-95.03%
TOTAL LIABILITIES
Total Short-Term Liabilities	$45.55M	$48.80M	$40.43M
Total Long-Term Liabilities	$51.42M	$3.910M	$4.018M
Total Liabilities	$134.6M	$131.7M	$129.5M
YoY Change	2.17%	0.57%	2.78%
SHAREHOLDERS EQUITY
Retained Earnings	-$1.184B	-$1.031B	-$1.006B
YoY Change	14.77%	6.15%
Common Stock	$1.549B	$1.531B	$1.484B
YoY Change	1.19%	5.03%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$365.3M	$499.5M	$477.7M
YoY Change
Total Liabilities & Shareholders Equity	$499.9M	$631.2M	$607.2M
YoY Change	-20.8%	2.31%	-2.16%

Cashflow Statement

Concept	2020 Q4	2019 Q4	2019 Q3
OPERATING ACTIVITIES
Net Income	-$23.54M	-$25.13M	-$11.47M
YoY Change	-6.33%	19.74%	-13.73%
Depreciation, Depletion And Amortization	$6.860M	$150.0K	$100.0K
YoY Change	4473.33%	-44.44%	-64.29%
Cash From Operating Activities	-$2.600M	-$17.61M	-$12.77M
YoY Change	-85.24%	-1434.09%	780.69%
INVESTING ACTIVITIES
Capital Expenditures	-$4.070M	-$2.680M	-$2.550M
YoY Change	51.87%	-90.46%	-90.12%
Acquisitions
YoY Change
Other Investing Activities	$60.00K	$7.400M	$6.230M
YoY Change	-99.19%	2076.47%	398.4%
Cash From Investing Activities	-$4.010M	$4.720M	$3.680M
YoY Change	-184.96%	-117.01%	-114.98%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	9.320M	46.40M	-390.0K
YoY Change	-79.91%	208.31%	-100.83%
NET CHANGE
Cash From Operating Activities	-2.600M	-17.61M	-12.77M
Cash From Investing Activities	-4.010M	4.720M	3.680M
Cash From Financing Activities	9.320M	46.40M	-390.0K
Net Change In Cash	2.710M	33.51M	-9.480M
YoY Change	-91.91%	-394.46%	-145.12%
FREE CASH FLOW
Cash From Operating Activities	-$2.600M	-$17.61M	-$12.77M
Capital Expenditures	-$4.070M	-$2.680M	-$2.550M
Free Cash Flow	$1.470M	-$14.93M	-$10.22M
YoY Change	-109.85%	-150.77%	-141.94%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2020Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	mux:LeaseLiabilityCurrent mux:LeaseLiabilityNonCurrent
CY2020Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	mux:LeaseLiabilityCurrent mux:LeaseLiabilityNonCurrent
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000314203
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	400339000
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	416587000
CY2019Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	mux:LeaseLiabilityCurrent mux:LeaseLiabilityNonCurrent
CY2019Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	mux:LeaseLiabilityCurrent mux:LeaseLiabilityNonCurrent
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-33190
CY2020	dei	Entity Registrant Name EntityRegistrantName	MCEWEN MINING INC.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	CO
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	84-0796160
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	150 King Street West
CY2020	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 2800
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Toronto
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	ON
CY2020	dei	Entity Address Country EntityAddressCountry	CA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	M5H 1J9
CY2020	dei	City Area Code CityAreaCode	866
CY2020	dei	Local Phone Number LocalPhoneNumber	441-0690
CY2020	dei	Security12b Title Security12bTitle	Common Stock, no par value
CY2020	dei	Trading Symbol TradingSymbol	MUX
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	406515026
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	459187391
CY2020	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	22910000
CY2019	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	24753000
CY2018	us-gaap	Cost Depreciation Amortization And Depletion CostDepreciationAmortizationAndDepletion	15079000
CY2020	us-gaap	Gross Profit GrossProfit	-26948000
CY2019	us-gaap	Gross Profit GrossProfit	8986000
CY2018	us-gaap	Gross Profit GrossProfit	32082000
CY2020	mux	Advanced Project Cost AdvancedProjectCost	11681000
CY2019	mux	Advanced Project Cost AdvancedProjectCost	9520000
CY2018	mux	Advanced Project Cost AdvancedProjectCost	15063000
CY2020	us-gaap	Exploration Costs ExplorationCosts	15861000
CY2019	us-gaap	Exploration Costs ExplorationCosts	37744000
CY2018	us-gaap	Exploration Costs ExplorationCosts	36576000
CY2020	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	9201000
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	12785000
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	11125000
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1517000
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-8754000
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-11865000
CY2020	us-gaap	Depreciation Nonproduction DepreciationNonproduction	405000
CY2019	us-gaap	Depreciation Nonproduction DepreciationNonproduction	566000
CY2018	us-gaap	Depreciation Nonproduction DepreciationNonproduction	1178000
CY2020	mux	Asset Retirement Obligation Reclamation Gross AssetRetirementObligationReclamationGross	1788000
CY2019	mux	Asset Retirement Obligation Reclamation Gross AssetRetirementObligationReclamationGross	3531000
CY2018	mux	Asset Retirement Obligation Reclamation Gross AssetRetirementObligationReclamationGross	3464000
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	83805000
CY2020	us-gaap	Other Nonrecurring Expense OtherNonrecurringExpense	1968000
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	126226000
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	72900000
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CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	-153174000
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	-63914000
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CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-7434000
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-6817000
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CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-541000
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	323000
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CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-96000
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CY2020	mux	Mineral Property Interests And Asset Retirement Obligations Amortization MineralPropertyInterestsAndAssetRetirementObligationsAmortization	23090000
CY2019	mux	Mineral Property Interests And Asset Retirement Obligations Amortization MineralPropertyInterestsAndAssetRetirementObligationsAmortization	25543000
CY2018	mux	Mineral Property Interests And Asset Retirement Obligations Amortization MineralPropertyInterestsAndAssetRetirementObligationsAmortization	16425000
CY2020	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-619000
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CY2018	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-3324000
CY2020	mux	Unrealized Foreign Exchange Gain Loss Asset Retirement Obligations UnrealizedForeignExchangeGainLossAssetRetirementObligations	-278000
CY2019	mux	Unrealized Foreign Exchange Gain Loss Asset Retirement Obligations UnrealizedForeignExchangeGainLossAssetRetirementObligations	-919000
CY2018	mux	Unrealized Foreign Exchange Gain Loss Asset Retirement Obligations UnrealizedForeignExchangeGainLossAssetRetirementObligations	1903000
CY2020	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-1390000
CY2019	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-3844000
CY2018	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-2770000
CY2020	us-gaap	Employee Benefits And Share Based Compensation Noncash EmployeeBenefitsAndShareBasedCompensationNoncash	612000
CY2019	us-gaap	Employee Benefits And Share Based Compensation Noncash EmployeeBenefitsAndShareBasedCompensationNoncash	694000
CY2018	us-gaap	Employee Benefits And Share Based Compensation Noncash EmployeeBenefitsAndShareBasedCompensationNoncash	269000
CY2020	us-gaap	Accretion Expense Including Asset Retirement Obligations AccretionExpenseIncludingAssetRetirementObligations	1788000
CY2019	us-gaap	Accretion Expense Including Asset Retirement Obligations AccretionExpenseIncludingAssetRetirementObligations	3531000
CY2018	us-gaap	Accretion Expense Including Asset Retirement Obligations AccretionExpenseIncludingAssetRetirementObligations	3464000
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-12696000
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	17484000
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-20896000
CY2020	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	1437000
CY2019	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	7270000
CY2018	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	-6290000
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-27873000
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-39527000
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	487000
CY2020	us-gaap	Payments To Acquire Mining Assets PaymentsToAcquireMiningAssets	13373000
CY2019	us-gaap	Payments To Acquire Mining Assets PaymentsToAcquireMiningAssets	29707000
CY2018	us-gaap	Payments To Acquire Mining Assets PaymentsToAcquireMiningAssets	81321000
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	84000
CY2018	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1384000
CY2020	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	1266000
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	6769000
CY2018	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	2895000
CY2020	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	340000
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	8877000
CY2018	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	10385000
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-11767000
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-14061000
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-69341000
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	69467000
CY2020	mux	Proceeds From Issuance Of Flow Through Common Stock ProceedsFromIssuanceOfFlowThroughCommonStock	19644000
CY2018	mux	Proceeds From Issuance Of Flow Through Common Stock ProceedsFromIssuanceOfFlowThroughCommonStock	14095000
CY2018	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	25000000
CY2018	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	25000000
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	908000
CY2019	mux	Proceeds From Issuance Of At Market Common Stock ProceedsFromIssuanceOfAtMarketCommonStock	1851000
CY2018	mux	Proceeds From Issuance Of At Market Common Stock ProceedsFromIssuanceOfAtMarketCommonStock	918000
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	138000
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	544000
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	192000
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2204000
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1855000
CY2018	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	485000
CY2018	us-gaap	Payments Of Capital Distribution PaymentsOfCapitalDistribution	3372000
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	17578000
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	70007000
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	60440000
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-408000
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1750000
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-22062000
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	16011000
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-6664000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	46500000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	30489000
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	37153000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	24438000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	46500000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	30489000
CY2020	us-gaap	Interest Paid Net InterestPaidNet	5131000
CY2019	us-gaap	Interest Paid Net InterestPaidNet	5218000
CY2018	us-gaap	Interest Paid Net InterestPaidNet	1923000
CY2020	us-gaap	Interest Income Other InterestIncomeOther	159000
CY2019	us-gaap	Interest Income Other InterestIncomeOther	133000
CY2018	us-gaap	Interest Income Other InterestIncomeOther	372000
CY2020	us-gaap	Nature Of Operations NatureOfOperations	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt 0pt 10pt 0pt;"><b style="font-weight:bold;">NOTE 1 NATURE OF OPERATIONS</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt 0pt 10pt 0pt;">McEwen Mining Inc. (the “Company”) was organized under the laws of the State of Colorado on July 24, 1979. The Company is engaged in the exploration, development, production and sale of gold and silver and exploration for copper.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;">The Company operates in the United States, Canada, Mexico and Argentina. The Company owns a 100% interest in the Gold Bar mine in Nevada, the Black Fox gold mine in Ontario, Canada, the El Gallo Project in Sinaloa, Mexico, the Fenix silver-gold project in Sinaloa, Mexico, the Los Azules copper deposit in San Juan, Argentina, and a portfolio of exploration properties in Nevada, Canada, Mexico and Argentina. It also owns a 49% interest in Minera Santa Cruz S.A. (“MSC”), owner of the producing San José silver-gold mine in Santa Cruz, Argentina, which is operated by the joint venture majority owner, Hochschild Mining plc.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;"><span style="visibility:hidden;"></span></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;">During the year (Note 14) and subsequent to year end (Note 23) the Company closed on $64.4 million in gross proceeds from equity financings. As a result of this, the Company believes it has sufficient liquidity along with funds generated from ongoing operations, to fund anticipated cash requirements for operations, capital expenditures and working capital purposes. As a result, the previously disclosed going concern note has been removed, as substantial doubt no longer exists regarding the Company’s ability to meet its obligations as they become due within one year after the date that the financial statements are issued.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;"><span style="visibility:hidden;"></span></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;"><span style="visibility:hidden;"></span></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;"><span style="visibility:hidden;"></span></p>
CY2020	mux	Ownership Percentage OwnershipPercentage	1
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt;"><b style="font-weight:bold;">Basis of Presentation and Use of Estimates:</b> </p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt 0pt 10pt 0pt;">The Company’s consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The preparation of the Company’s consolidated financial statements requires the Company to make estimates and assumptions that affect the reported amounts of assets and liabilities and the related disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of expenses during the reporting period. The more significant areas requiring the use of management estimates and assumptions relate to environmental reclamation and closure obligations; asset useful lives utilized for depletion, depreciation, amortization and accretion calculations; fair value of equity investment and the impairment test; recoverable gold in leach pad inventory; current and long-term inventory; mine development capitalization costs; the collectability of value added taxes receivable; reserves; valuation allowances for deferred tax assets; income and mining tax provisions; reserves for contingencies and litigation and costs and relief funds related to COVID-19. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Actual results may differ significantly from these estimates. </p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt 0pt 10pt 0pt;">References to “C$” refer to Canadian currency.</p>
CY2020	mux	Option To Sell Prior To Completion Of Refining OptionToSellPriorToCompletionOfRefining	0.90
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	83805000
CY2020	us-gaap	Other Nonrecurring Expense OtherNonrecurringExpense	1968000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-153715000
CY2020	mux	Payments To Acquire Property Plant And Equipment And Acquire Mining Assets PaymentsToAcquirePropertyPlantAndEquipmentAndAcquireMiningAssets	13925000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-63591000
CY2019	mux	Payments To Acquire Property Plant And Equipment And Acquire Mining Assets PaymentsToAcquirePropertyPlantAndEquipmentAndAcquireMiningAssets	30270000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-47640000
CY2018	mux	Payments To Acquire Property Plant And Equipment And Acquire Mining Assets PaymentsToAcquirePropertyPlantAndEquipmentAndAcquireMiningAssets	97468000
CY2020Q4	us-gaap	Noncurrent Assets NoncurrentAssets	445624000
CY2019Q4	us-gaap	Noncurrent Assets NoncurrentAssets	539150000
CY2020	us-gaap	Revenues Revenues	104789000
CY2019	us-gaap	Revenues Revenues	117019000
CY2018	us-gaap	Revenues Revenues	128175000
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	800000
CY2020	mux	Cost Incurred In Review Of Resources CostIncurredInReviewOfResources	500000
CY2020	mux	Unusual Or Infrequent Item Relief UnusualOrInfrequentItemRelief	6420000
CY2020	us-gaap	Gain Loss On Investments GainLossOnInvestments	-619000
CY2019	us-gaap	Gain Loss On Investments GainLossOnInvestments	5259000
CY2018	us-gaap	Gain Loss On Investments GainLossOnInvestments	-3324000
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	1078000
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	1697000
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	3922000
CY2020	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	14000
CY2019	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	184000
CY2018	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	570000
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6893000
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	7140000
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1168000
CY2018Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	3131000
CY2019	mux	Payments To Acquire Available For Sale And Trading Securities PaymentsToAcquireAvailableForSaleAndTradingSecurities	2314000
CY2019	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	4523000
CY2019	mux	Proceeds From Disposal Of Available For Sale And Trading Securities ProceedsFromDisposalOfAvailableForSaleAndTradingSecurities	8819000
CY2019	mux	Available For Sale And Trading Securities Gross Unrealized Gain Loss AvailableForSaleAndTradingSecuritiesGrossUnrealizedGainLoss	736000
CY2019Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	1885000
CY2019	us-gaap	Payments For Purchase Of Securities Operating Activities PaymentsForPurchaseOfSecuritiesOperatingActivities	1300000
CY2020Q4	us-gaap	Value Added Tax Receivable Current ValueAddedTaxReceivableCurrent	1810000
CY2019Q4	us-gaap	Value Added Tax Receivable Current ValueAddedTaxReceivableCurrent	2658000
CY2020Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	3880000
CY2019Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	2607000
CY2020Q4	mux	Receivables Other Assets Net Current ReceivablesOtherAssetsNetCurrent	5690000
CY2019Q4	mux	Receivables Other Assets Net Current ReceivablesOtherAssetsNetCurrent	5265000
CY2020	mux	Value Added Tax Collected ValueAddedTaxCollected	1400000
CY2019	mux	Value Added Tax Collected ValueAddedTaxCollected	2200000
CY2018	mux	Value Added Tax Collected ValueAddedTaxCollected	8300000
CY2020Q4	mux	Prepaid Insurance Receivable PrepaidInsuranceReceivable	2200000
CY2020	mux	Property Holding And Other Miscellaneous Deposits PropertyHoldingAndOtherMiscellaneousDeposits	1100000
CY2019Q4	mux	Prepaid Insurance Receivable PrepaidInsuranceReceivable	700000
CY2019	mux	Property Holding And Other Miscellaneous Deposits PropertyHoldingAndOtherMiscellaneousDeposits	1400000
CY2020Q4	mux	Inventory Ore On Leach Pads Net Of Reserves InventoryOreOnLeachPadsNetOfReserves	21003000
CY2019Q4	mux	Inventory Ore On Leach Pads Net Of Reserves InventoryOreOnLeachPadsNetOfReserves	37328000
CY2020Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	3922000
CY2019Q4	us-gaap	Inventory Work In Process Net Of Reserves InventoryWorkInProcessNetOfReserves	3847000
CY2020Q4	mux	Inventory Ore Stockpiles Net Of Reserves InventoryOreStockpilesNetOfReserves	635000
CY2019Q4	mux	Inventory Ore Stockpiles Net Of Reserves InventoryOreStockpilesNetOfReserves	1384000
CY2020Q4	mux	Inventory Precious Metals Net Of Reserves InventoryPreciousMetalsNetOfReserves	1344000
CY2019Q4	mux	Inventory Precious Metals Net Of Reserves InventoryPreciousMetalsNetOfReserves	1038000
CY2020Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	4845000
CY2019Q4	us-gaap	Inventory Raw Materials And Supplies Net Of Reserves InventoryRawMaterialsAndSuppliesNetOfReserves	4382000
CY2020Q4	us-gaap	Inventory Gross InventoryGross	31749000
CY2019Q4	us-gaap	Inventory Gross InventoryGross	47979000
CY2020Q4	us-gaap	Inventory Net InventoryNet	26964000
CY2019Q4	us-gaap	Inventory Net InventoryNet	38376000
CY2020Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	4785000
CY2019Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	9603000
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	83937000
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	144721000
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	34943000
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	37150000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	48994000
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	107571000
CY2020Q4	us-gaap	Mineral Properties Net MineralPropertiesNet	280118000
CY2019Q4	us-gaap	Mineral Properties Net MineralPropertiesNet	311220000
CY2020Q1	us-gaap	Asset Impairment Charges AssetImpairmentCharges	83800000
CY2020	mux	Subsidiary Percentage SubsidiaryPercentage	1
CY2020Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.49
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	4735000
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	6229000
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	761000
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	904000
CY2020Q4	mux	Lease Liability LeaseLiability	5496000
CY2019Q4	mux	Lease Liability LeaseLiability	7133000
CY2020Q4	mux	Lease Liability Current LeaseLiabilityCurrent	2440000
CY2019Q4	mux	Lease Liability Current LeaseLiabilityCurrent	2115000
CY2020Q4	mux	Lease Liability Non Current LeaseLiabilityNonCurrent	3056000
CY2019Q4	mux	Lease Liability Non Current LeaseLiabilityNonCurrent	5018000
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0683
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0873
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P2Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P4Y
CY2020	us-gaap	Lease Cost LeaseCost	1300000
CY2019	us-gaap	Lease Cost LeaseCost	1800000
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	517000
CY2020	mux	Finance Lease Cost FinanceLeaseCost	1270000
CY2019	mux	Finance Lease Cost FinanceLeaseCost	1640000
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	194000
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	193000
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	878000
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1123000
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	392000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	228000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	230000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	234000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	156000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	848000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	2467000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2186000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	274000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	24000
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	4951000
CY2020Q4	mux	Lease Liability Payments Due Next Twelve Months LeaseLiabilityPaymentsDueNextTwelveMonths	2695000
CY2020Q4	mux	Lease Liability Payments Due Year Two LeaseLiabilityPaymentsDueYearTwo	2416000
CY2020Q4	mux	Lease Liability Payments Due Year Three LeaseLiabilityPaymentsDueYearThree	508000
CY2020Q4	mux	Lease Liability Payments Due Year Four LeaseLiabilityPaymentsDueYearFour	180000
CY2020Q4	mux	Lease Liability Payments Due LeaseLiabilityPaymentsDue	5799000
CY2020Q4	mux	Lease Liability Undiscounted Excess Amount LeaseLiabilityUndiscountedExcessAmount	303000
CY2020Q4	mux	Lease Liability LeaseLiability	5496000
CY2020	mux	Debt Amendment Equity DebtAmendmentEquity	1875000
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	32201000
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	29402000
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	267000
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	513000
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1901000
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1680000
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-54000
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	1012000
CY2020	us-gaap	Asset Retirement Obligation Foreign Currency Translation Gain Loss AssetRetirementObligationForeignCurrencyTranslationGainLoss	219000
CY2019	us-gaap	Asset Retirement Obligation Foreign Currency Translation Gain Loss AssetRetirementObligationForeignCurrencyTranslationGainLoss	620000
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	34000000
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	32201000
CY2020Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	3232000
CY2019Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	2610000
CY2020Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	30768000
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	29591000
CY2020	mux	Reclamation Adjustments ReclamationAdjustments	-113000
CY2019	mux	Reclamation Adjustments ReclamationAdjustments	1851000
CY2018	mux	Reclamation Adjustments ReclamationAdjustments	2259000
CY2020	us-gaap	Accretion Expense AccretionExpense	1901000
CY2019	us-gaap	Accretion Expense AccretionExpense	1680000
CY2018	us-gaap	Accretion Expense AccretionExpense	1205000
CY2020	mux	Reclamation And Remediation Expense ReclamationAndRemediationExpense	1788000
CY2019	mux	Reclamation And Remediation Expense ReclamationAndRemediationExpense	3531000
CY2018	mux	Reclamation And Remediation Expense ReclamationAndRemediationExpense	3464000
CY2020	us-gaap	Stock Issued During Period Shares Purchase Of Assets StockIssuedDuringPeriodSharesPurchaseOfAssets	53600
CY2020	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	100000
CY2019	us-gaap	Stock Issued During Period Shares Purchase Of Assets StockIssuedDuringPeriodSharesPurchaseOfAssets	353570
CY2019Q2	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	1935484
CY2019Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	2600000
CY2019Q2	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	400000
CY2020Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	17500000
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Number Of Shares Per Employee ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee	1000000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	2308550
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	4221023
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4906000
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	2.45
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y7M6D
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	2564000
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	375000
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	1.90
CY2018	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	171000
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	1.02
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	195000
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	405000
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	3.99
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	462000
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	2.27
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	4243000
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	2.33
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	1475000
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	3050000
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	1.73
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	535000
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	1.01
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	419000
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	700000
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	2.56
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	789000
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	2.90
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	5269000
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	2.00
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P3Y
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	364000
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	5097000
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	1.22
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	135000
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	1.02
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	10000
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	1968000
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	2.18
CY2020	mux	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeited In Period Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodIntrinsicValue	2000
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	1251000
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	1.19
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	7012000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	1.55
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y2M12D
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	53000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	919000
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	3.02
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y7M6D
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.00157
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.00322
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.0145
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.0187
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.0267
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	0.0289
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.59
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.58
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.58
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	0.63
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	0.64
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P3Y6M
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P3Y6M
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P3Y6M
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	1.22
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	1.73
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	1.90
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	600000
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	700000
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	300000
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	100000
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	400000
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	700000
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	1400000
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	1000000.0
CY2018Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	400000
CY2020	mux	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Number EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptionsNumber	6100000
CY2019	mux	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Number EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptionsNumber	3000000.0
CY2018	mux	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Number EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptionsNumber	700000
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y7M6D
CY2019	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y6M
CY2018	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y4M24D
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-152325000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-59747000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-44870000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	403457000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	361845000
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	337297000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	403457000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	361845000
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	337297000
CY2020	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.38
CY2019	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.17
CY2018	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.13
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-47640000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-153715000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-63591000
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	48200000
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	49500000
CY2020Q4	mux	Operating Leases Future Minimum Payments Due Mining And Surface Rights Due In Next Twelve Months OperatingLeasesFutureMinimumPaymentsDueMiningAndSurfaceRightsDueInNextTwelveMonths	2233000
CY2020Q4	mux	Operating Leases Future Minimum Payments Due Mining And Surface Rights Due In Two Years OperatingLeasesFutureMinimumPaymentsDueMiningAndSurfaceRightsDueInTwoYears	492000
CY2020Q4	mux	Operating Leases Future Minimum Payments Due Mining And Surface Rights Due In Three Years OperatingLeasesFutureMinimumPaymentsDueMiningAndSurfaceRightsDueInThreeYears	488000
CY2020Q4	mux	Operating Leases Future Minimum Payments Due Mining And Surface Rights Due In Four Years OperatingLeasesFutureMinimumPaymentsDueMiningAndSurfaceRightsDueInFourYears	470000
CY2020Q4	mux	Operating Leases Future Minimum Payments Due Mining And Surface Rights Due Thereafter OperatingLeasesFutureMinimumPaymentsDueMiningAndSurfaceRightsDueThereafter	443000
CY2020Q4	mux	Operating Leases Future Minimum Payments Due Mining And Surface Rights Due OperatingLeasesFutureMinimumPaymentsDueMiningAndSurfaceRightsDue	4126000
CY2020Q4	mux	Reclamation Costs Due In Next Twelve Months ReclamationCostsDueInNextTwelveMonths	2819000
CY2020Q4	mux	Reclamation Costs Due In Second Year ReclamationCostsDueInSecondYear	5363000
CY2020Q4	mux	Reclamation Costs Due In Third Year ReclamationCostsDueInThirdYear	5510000
CY2020Q4	mux	Reclamation Costs Due In Fourth Year ReclamationCostsDueInFourthYear	564000
CY2020Q4	mux	Reclamation Costs Due Thereafter ReclamationCostsDueThereafter	27428000
CY2020Q4	mux	Reclamation Costs ReclamationCosts	41684000
CY2020Q4	mux	Long Term Debt Obligations In Next Twelve Months LongTermDebtObligationsInNextTwelveMonths	4875000
CY2020Q4	mux	Long Term Debt Obligations In Second Year LongTermDebtObligationsInSecondYear	14712000
CY2020Q4	mux	Long Term Debt Obligations In Third Year LongTermDebtObligationsInThirdYear	42139000
CY2020Q4	mux	Long Term Debt Obligations LongTermDebtObligations	61726000
CY2020Q4	mux	Lease Liability Payments Due Next Twelve Months LeaseLiabilityPaymentsDueNextTwelveMonths	2695000
CY2020Q4	mux	Lease Liability Payments Due Year Two LeaseLiabilityPaymentsDueYearTwo	2416000
CY2020Q4	mux	Lease Liability Payments Due Year Three LeaseLiabilityPaymentsDueYearThree	508000
CY2020Q4	mux	Lease Liability Payments Due Year Four LeaseLiabilityPaymentsDueYearFour	180000
CY2020Q4	mux	Lease Liability Payments Due LeaseLiabilityPaymentsDue	5799000
CY2020Q4	us-gaap	Contractual Obligation Due In Next Twelve Months ContractualObligationDueInNextTwelveMonths	12622000
CY2020Q4	us-gaap	Contractual Obligation Due In Second Year ContractualObligationDueInSecondYear	22983000
CY2020Q4	us-gaap	Contractual Obligation Due In Third Year ContractualObligationDueInThirdYear	48645000
CY2020Q4	us-gaap	Contractual Obligation Due In Fourth Year ContractualObligationDueInFourthYear	1214000
CY2020Q4	us-gaap	Contractual Obligation Due After Fifth Year ContractualObligationDueAfterFifthYear	27871000
CY2020Q4	us-gaap	Contractual Obligation ContractualObligation	113335000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-127524000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-22319000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-27001000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-26191000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-41272000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-20639000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	20843000
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	46452000
CY2020Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	3595000
CY2019Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	48000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	24438000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	46500000
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-817000
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2420000
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2185000
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-573000
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1424000
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-585000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1390000
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3844000
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2770000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-47640000
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-32280000
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-13354000
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-10004000
CY2020	us-gaap	Income Tax Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	-374000
CY2019	us-gaap	Income Tax Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	-2626000
CY2018	us-gaap	Income Tax Reconciliation Equity In Earnings Losses Of Unconsolidated Subsidiary IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	-2966000
CY2020	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	795000
CY2019	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	598000
CY2018	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	5963000
CY2020	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	496000
CY2019	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	3150000
CY2018	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	2100000
CY2020	mux	Income Tax Reconciliation Realized Flow Through Premium IncomeTaxReconciliationRealizedFlowThroughPremium	-338000
CY2019	mux	Income Tax Reconciliation Realized Flow Through Premium IncomeTaxReconciliationRealizedFlowThroughPremium	-2954000
CY2018	mux	Income Tax Reconciliation Realized Flow Through Premium IncomeTaxReconciliationRealizedFlowThroughPremium	-1675000
CY2020	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-147000
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	976000
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-2043000
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-200000
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	40000
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-7062000
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	8540000
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	4419000
CY2020	mux	Income Tax Reconciliation Unrealized Foreign Currency Exchange Rate Gain Loss IncomeTaxReconciliationUnrealizedForeignCurrencyExchangeRateGainLoss	4663000
CY2019	mux	Income Tax Reconciliation Unrealized Foreign Currency Exchange Rate Gain Loss IncomeTaxReconciliationUnrealizedForeignCurrencyExchangeRateGainLoss	-1095000
CY2018	mux	Income Tax Reconciliation Unrealized Foreign Currency Exchange Rate Gain Loss IncomeTaxReconciliationUnrealizedForeignCurrencyExchangeRateGainLoss	-6935000
CY2020	mux	Income Tax Reconciliation Net Operating Loss Expired IncomeTaxReconciliationNetOperatingLossExpired	1066000
CY2019	mux	Income Tax Reconciliation Net Operating Loss Expired IncomeTaxReconciliationNetOperatingLossExpired	810000
CY2018	mux	Income Tax Reconciliation Net Operating Loss Expired IncomeTaxReconciliationNetOperatingLossExpired	-120000
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	33086000
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-2941000
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	476000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1390000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3844000
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2770000
CY2020Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	66038000
CY2019Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	60299000
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	30999000
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	14356000
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	66085000
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	57667000
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	163122000
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	132322000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	154298000
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	121212000
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	8824000
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	11110000
CY2020Q4	mux	Deferred Tax Liabilities Acquisition Of Mineral Properties DeferredTaxLiabilitiesAcquisitionOfMineralProperties	12637000
CY2019Q4	mux	Deferred Tax Liabilities Acquisition Of Mineral Properties DeferredTaxLiabilitiesAcquisitionOfMineralProperties	16024000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	12637000
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	16024000
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3813000
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	4914000
CY2020	us-gaap	Valuation Allowances And Reserves Period Increase Decrease ValuationAllowancesAndReservesPeriodIncreaseDecrease	33100000
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	121212000
CY2020	mux	Valuation Allowance Deferred Tax Asset Increase Amount ValuationAllowanceDeferredTaxAssetIncreaseAmount	39794000
CY2020	mux	Valuation Allowance Deferred Tax Asset Decrease Amount ValuationAllowanceDeferredTaxAssetDecreaseAmount	6708000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	154298000
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	124153000
CY2019	mux	Valuation Allowance Deferred Tax Asset Increase Amount ValuationAllowanceDeferredTaxAssetIncreaseAmount	2104000
CY2019	mux	Valuation Allowance Deferred Tax Asset Decrease Amount ValuationAllowanceDeferredTaxAssetDecreaseAmount	5045000
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	121212000
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	123648000
CY2018	mux	Valuation Allowance Deferred Tax Asset Increase Amount ValuationAllowanceDeferredTaxAssetIncreaseAmount	12232000
CY2018	mux	Valuation Allowance Deferred Tax Asset Decrease Amount ValuationAllowanceDeferredTaxAssetDecreaseAmount	11727000
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	124153000
CY2020Q1	us-gaap	Gross Profit GrossProfit	-3685000
CY2020Q2	us-gaap	Gross Profit GrossProfit	-8875000
CY2020Q3	us-gaap	Gross Profit GrossProfit	-701000
CY2020Q4	us-gaap	Gross Profit GrossProfit	-13687000
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-99191000
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	-19814000
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-9778000
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	-23542000
CY2020Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.25
CY2020Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.05
CY2020Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.02
CY2020Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.06
CY2020Q1	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	400370000
CY2020Q2	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	400513000
CY2020Q3	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	403887000
CY2020Q4	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	408959000
CY2019Q1	us-gaap	Gross Profit GrossProfit	1429000
CY2019Q2	us-gaap	Gross Profit GrossProfit	4677000
CY2019Q3	us-gaap	Gross Profit GrossProfit	1619000
CY2019Q4	us-gaap	Gross Profit GrossProfit	1261000
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-10136000
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	-13014000
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-11465000
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	-25132000
CY2019Q1	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.02
CY2019Q2	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.04
CY2019Q3	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.03
CY2019Q4	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	-0.07
CY2019Q1	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	345497000
CY2019Q2	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	346998000
CY2019Q3	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	362175000
CY2019Q4	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	378543000
CY2020	us-gaap	Reclassifications Reclassifications	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt 0pt 10pt 0pt;"><b style="font-weight:bold;">NOTE 22 COMPARATIVE FIGURES</b></p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt 0pt 10pt 0pt;">Certain amounts in prior years have been reclassified to conform to the current year’s presentation. Reclassified amounts were not material to the financial statements and relate to the presentation of Other Operating Expenses. <i style="font-style:italic;">Advanced projects </i>in the <i style="font-style:italic;">Statement of Operations </i>includes mine development costs, property holding and general and administrative costs associated with advanced stage projects. <i style="font-style:italic;">Exploration </i>in the <i style="font-style:italic;">Statement of Operations </i>includes exploration expenses, property holding and general and administrative costs associated with exploration stage projects. <i style="font-style:italic;">General and</i> <i style="font-style:italic;">Administrative </i>in the <i style="font-style:italic;">Statement of Operations </i>include corporate (head office) general and administrative costs.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt 0pt 10pt 0pt;"><span style="visibility:hidden;"></span></p>

Files In Submission

Name	View Source	Status
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$MUX
McEwen Mining Inc. Stock $mux

2020 Q4 Form 10-K Financial Statement

#000155837021002708 Filed on March 10, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MUX McEwen Mining Inc. Stock $mux

2020 Q4 Form 10-K Financial Statement

#000155837021002708 Filed on March 10, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MUX
McEwen Mining Inc. Stock $mux