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Supplies inventories, net Inventory, Net Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Warrant outstanding (in shares) Class of Warrant or Right, Outstanding Fair value measurements Fair Value Disclosures [Text Block] Supplemental Cash Flow Information [Abstract] Asset retirement obligation adjustments and accretion Asset Retirement Obligation, Revision of Estimate, Operating Expenses Asset Retirement Obligation, Revision of Estimate, Operating Expenses PEO Name PEO Name Restricted cash Restricted Cash Prepaids: Prepaid Expense, Current [Abstract] Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Surety bond cash collateral Surety Bond Cash Collateral [Member] Surety Bond Cash Collateral Interest expense Interest Expense, Debt Cash, cash equivalents, and restricted cash, beginning of period Cash, cash equivalents, and restricted cash, end of period Total cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Schedule of Changes in ARO Schedule of Change in Asset Retirement Obligation [Table Text Block] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Common stock issued (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Disposal Group Name [Axis] Disposal Group Name [Axis] Basic (in dollars per share) Net loss per common share, basic (in dollars per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Contract liabilities Contract with Customer, Liability, Current Risk free rate Measurement Input, Risk Free Interest Rate [Member] Current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Inflation Rate Measurement Input, Inflation Rate [Member] Measurement Input, Inflation Rate Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accumulated deficit Retained Earnings (Accumulated Deficit) Restricted cash Total Restricted Cash, Noncurrent Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Long-Lived Assets Held-for-Sale, Name [Domain] Long-Lived Assets Held-for-Sale, Name [Domain] Cover [Abstract] Cover [Abstract] Reclassification of prior year presentation Reclassification, Comparability Adjustment [Policy Text Block] Production leach pads Production Leach Pads [Member] Represents leach pads. Class of warrant or right, warrants exercised (in shares) Class Of Warrant Or Right, Warrants Exercised Class Of Warrant Or Right, Warrants Exercised Equity Awards Adjustments Equity Awards Adjustments [Member] Assets held-for-sale Disposal Group, Including Discontinued Operation, Assets, Noncurrent Test leach pads Test Leach Pads [Member] Test Leach Pads Total liabilities and stockholders’ equity Liabilities and Equity Surety bond cash collateral Reclamation and Other Surety Bond Cash Collateral [Member] Reclamation and Other Surety Bond Cash Collateral Employee Stock Option Share-Based Payment Arrangement, Option [Member] Asset retirement obligation Current Asset Retirement Obligation, Current Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Other income (loss), net Other Nonoperating Income (Expense) Number of warrants exercised (in shares) Class Of Warrant Or Right, Number Of Warrants Exercised Class Of Warrant Or Right, Number Of Warrants Exercised Accretion Asset Retirement Obligation, Accretion Expense Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Other (income) expense, net Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name Accrued directors fees Accrued Director Fees, Current Accrued Director Fees, Current Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Schedule of Investments Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Canceled/forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period General and administrative costs General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Receivables Receivables, Net, Current Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Exploration Exploration Expense Accounts payable, accrued expenses, and other liabilities Accounts Payable, Accrued Liabilities and Other Liabilities [Text Block] Accounts Payable, Accrued Liabilities and Other Liabilities Name Measure Name Income taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other non-cash items Other Noncash Income (Expense) Proceeds from sale of equity securities Proceeds from Sale of Equity Securities, FV-NI Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Voluntary surrender of shares by shareholder (in shares) Surrender Of Shares By Shareholder, Shares Surrender Of Shares By Shareholder, Shares Restricted cash Restricted Assets Disclosure [Text Block] Mine equipment Mine Equipment [Member] Represents mine equipment. Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Prepaids and deposits, current: Prepaid Expense and Other Assets, Current [Abstract] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Company Selected Measure Amount Company Selected Measure Amount Investments, Debt and Equity Securities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Stock, Class of Stock [Table] Stock, Class of Stock [Table] Share price, ten day average (in dollars per share) Share Price, Ten Day Average Share Price, Ten Day Average Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Vested (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Depreciation and amortization Depreciation, Nonproduction Income tax expense (benefit) Income Tax Expense (Benefit) Award Timing Method Award Timing Method [Text Block] Net increase in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Deferred gain on sale of royalty Deferred Gain On Sale of Royalty, Noncurrent Deferred Gain On Sale of Royalty, Noncurrent Change in estimates Asset Retirement Obligation, Revision of Estimate Net loss Net loss Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Restatement Determination Date: Restatement Determination Date [Axis] Number of securities called by each warrant (in shares) Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Segment expenses Segment Expenses Segment Expenses Interest income Investment Income, Interest Exercise of warrants (in shares) Warrants Exercised During Period, Shares Warrants Exercised During Period, Shares Receivables Increase (Decrease) in Receivables Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]