75000 - Document - Document And Entity Information
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75010 - Statement - Condensed Consolidated Balance Sheets (Unaudited)
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75020 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)
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75030 - Statement - Condensed Consolidated Statements of Operations (Unaudited)
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75040 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)
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75050 - Statement - Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited)
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995457 - Disclosure - Note 1 - Organization and Business
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995467 - Disclosure - Note 2 - Basis of Presentation
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995477 - Disclosure - Note 3 - Liquidity
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995487 - Disclosure - Note 4 - Summary of Significant Accounting Policies
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995497 - Disclosure - Note 5 - Investment in the Peak Gold JV
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995507 - Disclosure - Note 6 - Prepaid Expenses and Other
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995517 - Disclosure - Note 7 - Net Loss Per Share
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995527 - Disclosure - Note 8 - Stockholders' Equity
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995537 - Disclosure - Note 9 - Property & Equipment
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995547 - Disclosure - Note 10 - Stock-Based Compensation
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995557 - Disclosure - Note 11 - Commitments and Contingencies
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995567 - Disclosure - Note 12 - Income Taxes
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995577 - Disclosure - Note 13 - Debt
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995587 - Disclosure - Note 14 - Derivatives and Hedging Activities
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995597 - Disclosure - Note 15 - Fair Value Measurement
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995607 - Disclosure - Note 16 - Acquisition
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995617 - Disclosure - Note 17 - General and Administrative Expenses
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995627 - Disclosure - Note 18 - Segments
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995637 - Disclosure - Note 19 - Related Party Transactions
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995647 - Disclosure - Note 20 - Subsequent Events
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995657 - Disclosure - Summary of Significant Accounting Policies (Policies)
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995667 - Disclosure - Note 5 - Investment in the Peak Gold JV (Tables)
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995677 - Disclosure - Note 7 - Net Loss Per Share (Tables)
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995687 - Disclosure - Note 9 - Property & Equipment (Tables)
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995697 - Disclosure - Note 10 - Stock-Based Compensation (Tables)
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995707 - Disclosure - Note 13 - Debt (Tables)
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995717 - Disclosure - Note 14 - Derivatives and Hedging Activities (Tables)
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995727 - Disclosure - Note 15 - Fair Value Measurement (Tables)
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995737 - Disclosure - Note 16 - Acquisition (Tables)
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995747 - Disclosure - Note 17 - General and Administrative Expenses (Tables)
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995757 - Disclosure - Note 18 - Segments (Tables)
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995767 - Disclosure - Note 1 - Organization and Business (Details Textual)
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995777 - Disclosure - Note 3 - Liquidity (Details Textual)
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995787 - Disclosure - Note 5 - Investment in the Peak Gold JV (Details Textual)
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995797 - Disclosure - Note 5 - Investment in Peak Gold JV - Roll-forward of Investment in the Joint Venture Company (Details)
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995807 - Disclosure - Note 5 - Investment in Peak Gold JV - Condensed Results of Operations for Peak Gold, LLC (Details)
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995817 - Disclosure - Note 6 - Prepaid Expenses and Other (Details Textual)
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995827 - Disclosure - Note 7 - Net Loss Per Share (Details Textual)
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995837 - Disclosure - Note 7 - Net Loss Per Share - Reconciliation of the Components of Basic and Diluted Net Loss Per Share (Details)
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995847 - Disclosure - Note 8 - Stockholders' Equity (Details Textual)
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995857 - Disclosure - Note 8 - Stockholders' Equity Acquisition (Details Textual)
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995867 - Disclosure - Note 9 - Property & Equipment - Fixed Assets (Details)
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995877 - Disclosure - Note 10 - Stock-Based Compensation (Details Textual)
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995887 - Disclosure - Note 10 - Stock-Based Compensation - Schedule of Unvested Restricted Stock (Details)
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995897 - Disclosure - Note 10 - Stock-Based Compensation - Summary of Stock Options (Details)
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995907 - Disclosure - Note 11 - Commitments and Contingencies (Details Textual)
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995917 - Disclosure - Note 12 - Income Taxes (Details Textual)
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995927 - Disclosure - Note 13 - Debt - Components of Debt (Details)
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995937 - Disclosure - Note 13 - Debt - Components of Debt (Details) 2
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995947 - Disclosure - Note 13 - Debt (Details Textual)
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995957 - Disclosure - Note 14 - Derivatives and Hedging Activities (Details Textual)
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995967 - Disclosure - Note 14 - Derivatives and Hedging Activities - Derivatives Not Designated as Hedging (Details)
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995977 - Disclosure - Note 14 - Derivatives and Hedging Activities - Fair Values of Derivative Instruments on the Balance Sheet (Details)
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995987 - Disclosure - Note 14 - Derivatives and Hedging Activities - Effect on Statement of Operations (Details)
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995997 - Disclosure - Note 15 - Fair Value Measurement - Summary of Fair Value of Financial Assets and Liabilities (Details)
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996007 - Disclosure - Note 16 - Acquisition (Details Textual)
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996017 - Disclosure - Note 16 - Acquisition - Summary of Fair Value of the Consideration and the Allocation to the Net Assets Acquired (Details)
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996027 - Disclosure - Note 16 - Acquisition - Summary of Fair Value of the Consideration and the Allocation to the Net Assets Acquired (Parentheticals) (Details)
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996037 - Disclosure - Note 17 - General and Administrative Expenses - Components of General and Administrative Expenses (Details)
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996047 - Disclosure - Note 18 - Segments (Details Textual)
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996057 - Disclosure - Note 18 - Segments - Schedule of Segment Information (Details)
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996067 - Disclosure - Note 19 - Related Party Transactions (Details Textual)
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996077 - Disclosure - Note 20 - Subsequent Events (Details Textual)
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Debt Instrument, Interest Rate, Effective Percentage, Amortization of Discount and Issuance Costs
ctgo_DebtInstrumentInterestRateEffectivePercentageAmortizationOfDiscountAndIssuanceCosts
Effective interest rate for the original issue discount or premium and issuance costs under the debt agreement.
Alaska Gold Torrent, LLC [Member]
Represents Alaska Gold Torrent, LLC.
Business Combination, Acquisition-Related Cost, Expense
Transaction costs
Drawdown prepayments into income.
Drawdown prepayments into income
Deferred Compensation Equity
Segments [Domain]
Entity Incorporation, State or Country Code
Preferred Stock, Shares Issued
Preferred Stock, Shares Issued (in shares)
Preferred stock, shares issued (in shares)
Statement of Financial Position Location, Balance [Domain]
Adjustments to Additional Paid in Capital Common Stock Issuance for Acquisitions, Shares
Adjustments to additional paid in capital common stock issuance for acquisitions, shares.
Common stock issuance for acquisition, (in shares)
Debt, net
Non-current debt, net
Debt non-current portion, net
Debt non-current portion, net
Plan Name [Axis]
Grantee Status [Domain]
Entity Current Reporting Status
EXPENSES:
Fair Value, Inputs, Level 2 [Member]
Commitments and Contingencies Disclosure [Text Block]
Commitments and Contingencies
Common Stock, Shares Authorized (in shares)
Common stock, shares authorized (in shares)
Number of shares in escrow
Number of shares in escrow
Number of shares in escrow.
Document Fiscal Period Focus
Exchangeable shares issuance for acquisition
Exchangeable shares issuance for acquisition.
Debt Instrument, Interest Rate, Stated Percentage
us-gaap_DebtInstrumentInterestRateStatedPercentage
Entity Shell Company
Grantee Status [Axis]
Convertible Debt [Member]
Unsecured, Subordinated Convertible Debenture [Member]
Cash and cash equivalents
Cash and cash equivalents
Cash and Cash Equivalent, Total
cash and cash equivalent balance
Shares withheld at closing
Business Combination, Consideration Transferred and Preacquisition Equity Interest in Acquiree
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held before Combination, Total
Represents ownership percentage under investor right agreement.
Investor Right Agreement Ownership Percentage
Investor Right Agreement, Ownership Percentage
Note 11 - Stock-Based Compensation - Summary of Stock Options (Details)
Net Assets
Net Assets (Deficit)
State Of Alaska From Cook Inlet Region Inc [Member]
State of Alaska from Cook Inlet Region Inc.
State of Alaska from Cook Inlet Region Inc. [Member]
Research and Development Arrangement, Contract to Perform for Others, Type [Axis]
Common stock, shares issued (in shares)
Statement [Table]
Shares Issued for Convertible Debt Interest Payment
Shares issued for convertible debt interest payment.
'Shares issued for convertible debt interest payment
Rule10b51ArrModifiedFlag
Rule10b51ArrModifiedFlag.
Weighted average fair value per share of options granted during the period (in dollars per share)
Weighted average fair value of options granted during the period (in dollars per share)
Payments to Acquire Businesses, Gross
Cash consideration
Acquisition of Contango Lucky Shot Alaska, LLC
Equity Method Investment, Total Contributions
ctgo_EquityMethodInvestmentTotalContributions
Te total cash and noncash contributions to equity method investment.
Contributions made
Statement [Line Items]
Business Combination [Domain]
Avidian Gold Corp.1.
Avidian Gold Corp.1 [Member]
Avidian Gold Corp. [Member]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price
Expired unexercised, weighted average exercise price (in dollars per share)
Entity Filer Category
Commitment fee derecognized and added to debt discount
Commitment Fee Derecognized And Added To Debt Discount
Commitment fee derecognized and added to debt discount.
Note 15 - Derivatives and Hedging Activities
Balance of the Equity
Balance of the Equity
us-gaap_LiabilitiesAndStockholdersEquity
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY
Vehicles [Member]
us-gaap_LongTermDebtCurrent
Long-Term Debt, Current Maturities, Total
Less current portion
Debt, current portion
Located in fairbanks mining district.
Located in Fairbanks Mining District [Member]
Underwriting Offering [Member]
Underwriting Offering [Member]
Underwriting offering.
Long-Lived Tangible Asset [Axis]
Fair Value, by Balance Sheet Grouping [Table Text Block]
Summary of Fair Value of Financial Assets and Liabilities
State of Alaska Mining Claims Located North and Northwest of Tetlin Lease [Member]
Represents the State of Alaska mining claims located north and northwest of the Tetlin Lease.
Outstanding equity interests acquired
Business Combination, Voting Equity Interest Acquired, Percentage
Shares repurchased for tax withholdings on share-based awards
Shares Repurchased During Period Value For Tax Withholdings On Share Based Awards
Shares repurchased during period value for tax withholdings on share based awards.
Commodity Contract 2026 [Member]
Commodity contract 2026.
Shares Issued, Price Per Share (in dollars per share)
us-gaap_SharesIssuedPricePerShare
Subsequent Event [Line Items]
Noncash or Part Noncash Acquisition, Payables Assumed
Consideration payable for Avidian acquisition
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective Income Tax Rate Reconciliation, Percent
Effective tax rate
Effective Income Tax Rate Reconciliation, Percent, Total
Employee Stock Option [Member]
Treasury stock at cost
Treasury stock at cost (2,480 at March 31, 2026; and 2,480 shares at December 31, 2025)
Income Tax Jurisdiction [Axis]
Geographical [Domain]
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) [Abstract]
Allocation to net assets acquired:
LONG-TERM ASSETS:
Additional paid-in capital
Additional paid-in capital
Treasury stock at cost (2,480 at June 30, 2025; and 2,480 shares at December 31, 2024)
Brad Juneau [Member]
Brad Juneau.
Brad Juneau [Member]
Gross amount offset, asset
us-gaap_DerivativeAssetFairValueGrossLiability
Significant Accounting Policies [Text Block]
Summary of Significant Accounting Policies
Property, Plant and Equipment [Line Items]
Cash Reserve Deposit Required and Made
Cash deposit
ATM Offering [Member]
ATM offering.
ATM Offering [Member]
Debt Instrument, Maturity Date, Description
Maturity date, description
Vesting [Domain]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)
Granted (in shares)
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Shares forfeited for employee taxes
Stock Issued During Period Value Forfeited For Employee Taxes
Stock issued during period value forfeited for employee taxes.
Investment, Name [Axis]
Basic and diluted (in dollars per share)
Net loss per share, basic
Loss Per Share, basic (in dollars per share)
Repayments of Long-Term Debt, Total
Repayments of Long-Term Debt
us-gaap_RepaymentsOfLongTermDebt
Principal payments
Principal repayments on debt
Right of Use Asset [Member]
Right-of-use asset.
Right of Use Asset [Member]
Working Capital
Working capital.
Working capital balance
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)
Outstanding (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Outstanding (in shares)
Options, outstanding (in shares)
Fair Value Of Common Stock Share Issued
Fair value of common stock share issued.
Fair value of common stock share issued
Stock Issued
Common stock issuance for acquisition
Director Fee
Director fees
Total current liabilities
us-gaap_LiabilitiesCurrent
Extension of Term of Leases and Concessions on Undeveloped Acreage (Year)
ExtensionOfTermOfLeasesAndConcessionsOnUndevelopedAcreage
Represents the extension of the term of leases and concessions on undeveloped acreage.
Adjustments to reconcile net loss to net cash provided by operating activities:
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Hedging Designation [Domain]
Weighted average price (in USD per Ounce)
Underlying, Derivative Mass (in USD per Ounce)
us-gaap_UnderlyingDerivativeMass
Domestic Tax Jurisdiction [Member]
Federal [Member]
Note 11 - Stock Based Compensation
Two Employees [Member]
Represents information related to two employees.
Interest Expense, Debt, Excluding Amortization
us-gaap_InterestExpenseDebtExcludingAmortization
Tetlin Village Land [Member]
Tetlin [Member]
Tetlin.
Equity Plan [Member]
Equity plan.
Consolidation Items [Domain]
STOCKHOLDERS' EQUITY:
Exchangeable shares issuance for acquisition Shares
Exchangeable shares issuance for acquisition shares.
Exchangeable shares issuance for acquisition shares, (in shares)
Entity Small Business
Derivative Contract Asset, Current [Member]
Derivative contract asset, current.
Hedging Designation [Axis]
Commodity Contract [Member]
Accumulated deficit
Accumulated deficit
Underwritten Public Offering [Member]
Represents underwritten public offering.
Represents the amount of advance royalties to be paid per year.
ctgo_AdvanceRoyaltiesToBePaidPerYear
Advance Royalties to Be Paid Per Year
Accretion expense
Accretion
Accretion
Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Total
Unrealized Gain (Loss) on Derivatives and Commodity Contracts
Amount of unrealized gain (loss) recognized in other income (expense)
Unrealized loss on derivative contracts
Forfeited (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Contango shareholders.
Contango Shareholders [Member]
Share-Based Payment Arrangement [Text Block]
Stock-Based Compensation
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Travel and Entertainment Expense
Travel
Lease Contractual Term [Axis]
Project [Domain]
Asset Acquisition, Contingent Consideration Arrangements, Production Threshold, Mineral Resource (Ounce)
ctgo_AssetAcquisitionContingentConsiderationArrangementsProductionThresholdMineralResource
Amount of mineral resource used to determine the contingent consideration in an asset acquisition.
Amendment Flag
Annual Claim Rentals
ctgo_AnnualClaimRentals
Represents the amount of annual claim rentals payable, as of the balance sheet date.
Avidian Alaska.
Avidian Alaska [Member]
Number of shares that can be purchased by pre-funded warrants
Class of Warrant or Right, Number of Securities Called by Warrants or Rights
Chief Executive Officer [Member]
Entity Address, Postal Zip Code
us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash from operating activities
Net cash (used in)/provided by operating activities
Cash from operating activities
Relating to awards granted January 8, 2024.
Awards Granted January 8, 2024 [Member]
Near Fort Knox Gold Mine [Member]
Near fort knox gold mine.
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description
Segment reporting, CODM, profit (loss) measure, description
Common Stock [Member]
Common Stock [Member]
Contractual Annual Exploration Costs
ctgo_ContractualAnnualExplorationCosts
Represents the contractual exploration costs to be paid per year, pursuant to the terms of the agreement.
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Granted, weighted average exercise price (in dollars per share)
Amount of annual base salary.
Annual Base Salary
ctgo_AnnualBaseSalary
Less: Accumulated depreciation and amortization
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Dolly Varden Acquisition [Member]
Dolly Varden Acquisition.
Dolly Varden Acquisition [Member]
Research and Development Arrangement, Contract to Perform for Others, Type [Domain]
AggregateOfferingPriceOfCommonShare
AggregateOfferingPriceOfCommonShare
Aggregate offering price of common share
Debt Instrument, Interest Rate, Effective Percentage
us-gaap_DebtInstrumentInterestRateEffectivePercentage
Payments for Purchase Agreement
Payments for Purchase Agreement
Entity Address, Address Line One
Represents the percentage fee related to debt instrument.
Debt Instrument Fee Percentage
Debt Instrument, Fee Percentage
Fair Value Hierarchy and NAV [Axis]
Lucky Shot [Member]
Lucky shot.
Lucky Shot [Member]
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger
us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
LOSS PER SHARE
Net Loss Per Share
Supplemental disclosure of cash flow information
Derivative asset
Derivative Asset
Derivative Asset, Total
Tranche three.
Tranche Three [Member]
Due on or Before the 6-month Anniversary [Member]
Statement of Financial Position Location, Balance [Axis]
Exchangeable Shares Of Common Stock Issued At A Fair Value
Exchangeable shares of common stock issued at a fair value.
Exchangeable shares of common stock issued at a fair value
Repurchase Agreements and Similar Transactions, Maturity Periods [Axis]
Increase (Decrease) in Income Taxes
Increase in income taxes payable
Commitments and contingencies disclosure.
Commitments And Contingencies Disclosure [Table]
Accretion Recovery Expense
Accretion recovery expense.
Accretion
Document Type
Gross profit
Gross Profit
Gross profit
Collaborative Arrangement and Arrangement Other than Collaborative [Axis]
Exchangeable Stock [Member]
Exchangeable stock.
Collaborative Arrangement and Arrangement Other than Collaborative [Domain]
Entity Central Index Key
Lease agreement payment obligation amount.
Lease Agreement Payment Obligation Amount
Lease agreement payment obligation amount
Note 15 - Fair Value Measurement
Royalties Recognized In Interest And Other Income
Royalties recognized in interest and other income.
Royalties recognized in interest and other income
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Cash
NET CHANGE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Subsequent Event Type [Domain]
Offering Agreement, Maximum Aggregate Common Shares May be Offered
ctgo_OfferingAgreementMaximumAggregateCommonSharesMayBeOffered
Maximum amount of common shares may be offered under offering agreement.
Business Combination, Consideration Transferred, Equity Interest, Type [Domain]
Common stock, par value per share
Common Stock, Par or Stated Value Per Share (in dollars per share)
Common stock, par value (in dollars per share)
Base Rate [Member]
Asset Acquisition, Contingent Consideration, Liability, Total
Asset Acquisition, Contingent Consideration, Liability
Contingent payable
Realized gain
Realized Investment Gains (Losses)
Realized Investment Gains (Losses), Total
Liquidity [Text Block]
The entire disclosure for liquidity.
Liquidity
State of Alaska Mining Claims for Exploration and Development [Member]
Represents the lease related to state of Alaska mining claims for exploration and development.
Exercised (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Debt Disclosure [Abstract]
Percentage Of Ownership
Percentage of ownership.
Ownership percentage
Exchangeable Shares [Member]
Exchangeable Shares.
Consulting Fees
Consulting fees.
Overriding Net Smelter Return Royalty Percentage
Overriding net smelter return royalty percentage.
Overriding net smelter return royalty, percentage
Accrued liabilities
Accrued liabilities
Annual lease fee
Annual Lease Fee
Annual lease fee.
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Ownership [Domain]
Current Fiscal Year End Date
Document Quarterly Report
Near Fort Knox [Member]
Near fort knox.
Additional Properties [Member]
Represents information pertaining to additional properties (other than the Tetlin Lease and other certain properties).
Equity Method Investment Ownership Percentage By Former Owner
Equity method investment ownership percentage by former owner.
Equity method investment, ownership percentage by former owner
State of Alaska Mining Claims Located Near Lucky Shot Property [Member]
Represents State of Alaska Mining Claims Located Near Lucky Shot Property.
Entity Address, State or Province
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Balance
Balance
Restricted shares unvested
Stock issued for convertible note interest payment
Shares issued for convertible debt interest payment
Investment, Name [Domain]
Johnson tract property.
Johnson Tract Property [Member]
Johnson Tract Project [Member]
Johnson Tract [Member]
Asset Acquisition [Domain]
Preferred Stock, Shares Outstanding, Ending Balance
Preferred Stock, Shares Outstanding, Beginning Balance
Preferred stock, shares outstanding (in shares)
Preferred Stock, Shares Outstanding (in shares)
Lease agreement period.
Lease Agreement Period
Lease agreement period
Geographical [Axis]
Professional Fees
Professional fees
Interest and Other Income
Interest and other income
Lease agreement payment obligation increase amount.
Lease Agreement Payment Obligation Increase Amount
Lease agreement payment obligation increase amount
Commodity Contract 2025 [Member]
Commodity contract 2025.
Subsequent Event [Member]
Subsequent Event [Member]
Equity Method Investment, Nonconsolidated Investee [Domain]
Property, Plant and Equipment [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant Date Fair Value
ctgo_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantDateFairValue
Grant date fair value of award under share-based payment arrangement. Excludes share and unit options.
Total long-term assets
us-gaap_OtherAssetsNoncurrent
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Total
Unamortized debt discount and issuance costs
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current
Prepaid expenses and other
Term Loan Facility [Member]
Represents term loan facility.
Expired (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period
Expired unexercised (in shares)
Interest Expense, Debt
us-gaap_InterestExpenseDebt
Debt Instrument, Convertible, Number of Equity Instruments
us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments
State and Local Jurisdiction [Member]
State [Member]
Derivative Liability
Derivative Liability, Total
Derivative liability
Treasury stock, shares (in shares)
State of Alaska Mining Claims Located North and East of Lucky Shot Property [Member]
Represents the State of Alaska mining claims located north and east of the Lucky Shot Property.
Contingent Salary and Compensation, Retention Agreement
ctgo_ContingentSalaryAndCompensationRetentionAgreement
The amount of salary and compensation retention agreement that is contingently payable.
Business Combination, Consideration Transferred
Business Combination, Consideration Transferred, Total
Consideration
Gold to Silver Ratio
ctgo_GoldToSilverRatio
Represents the gold to silver ratio.
Preferred Stock, Value, Issued
Preferred Stock
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Value
Value of share
Asset Acquisition, Consideration Transferred, Contingent Consideration
us-gaap_AssetAcquisitionConsiderationTransferredContingentConsideration
The 2023 Plan.
The 2023 Plan [Member]
The 2023 Plan [Member]
Replacement options issuance for acquisition
Replacement options issuance for acquisition.
Minimum [Member]
Gross Asset
Derivative contract asset - current
CURRENT ASSETS:
Prepaid Expenses [Text Block]
The complete disclosure for prepaid expenses.
Prepaid Expenses and other assets
Debt Instrument, Interest Paid in Cash, Percentage
ctgo_DebtInstrumentInterestPaidInCashPercentage
Represents interest paid in cash, percentage.
The Joint Venture Company [Member]
Represents information pertaining to Peak Gold, LLC, a limited liability company.
The Joint Venture Company [Member]
Fair Value, Inputs, Level 3 [Member]
Vesting Between April 2022 and January 2024 [Member]
Represents vesting between April 2022 and January 2024.
Gold Delivered or Cash Settled
Gold delivered or cash settled.
Gold delivered or cash settled
Segment Reporting [Abstract]
CURRENT LIABILITIES:
Risk management objective of using derivatives.
Risk Management Objective of Using Derivatives [Policy Text Block]
Risk Management Objective of Using Derivatives
Share-Based Compensation Arrangement by Share-Based Payment Award, Options and Warrants, Outstanding, Number (in shares)
ctgo_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndWarrantsOutstandingNumber
Number of options and warrants outstanding.
Exploration Segment [Member]
Exploration segment.
Exploration [Member]
Related Party Transactions [Abstract]
Business Combination, Consideration Transferred, Equity Interest, Type [Axis]
Balance (in shares)
Balance (in shares)
us-gaap_SharesOutstanding
Equity Plans [Member]
Equity Plans.
Onyx Gold Corp [Member]
Onyx Gold Corp.
Onyx [Member]
Commitments and Contingencies
COMMITMENTS AND CONTINGENCIES (NOTE 11)
Forecast [Member]
Common Stock, No Par Value
Common stock, no par value
Restricted cash
Restricted cash
Peak Gold, LLC [Member]
Represents information pertaining to Peak Gold, LLC.
Peak Gold JV [Member]
Liability On Flow Through Share Issuances
Liability on flow-through share issuances.
Liability on flow-through share issuances
Marketable Securities, Noncurrent
Marketable securities
Marketable securities - noncurrent
Non-cash portion for lease expense
Noncash Portion For Lease Expense
Non-cash portion for lease expense.
Incurred Interest And Finance Expense
Incurred interest and finance expense.
Incurred PLA fee
NON-CURRENT LIABILITIES:
Royalty reimbursement advance
Royalty reimbursement advance noncurrent
Royalty reimbursement advance noncurrent.
The 2026 Plan [Member]
The 2026 plan.
us-gaap_InterestIncomeExpenseNet
Interest and finance expense
Interest Income (Expense), Operating, Total
Interest expense
Cash invested in Peak Gold, LLC
Investment in Peak Gold, LLC
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net Income/(Loss)
Net Income
Lease Contractual Term [Domain]
Carry Trade [Member]
Carry trade.
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent
Cash and cash equivalents
Percentage of production royalty rate increase.
Percentage of Production Royalty Rate Increase
Percentage of production royalty rate increase
Long-Term Debt, Type [Domain]
Weighted Average Shares, basic (in shares)
us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average number of shares outstanding, basic
Fair Value Of Replacement Options Granted Allocated To Consideration
Fair value of replacement options granted allocated to consideration.
Fair value of replacement options granted allocated to consideration
Adjustments to Additional Paid in Capital Common Stock Issuance for Acquisitions
Adjustments to additional paid in capital common stock issuance for acquisitions.
Common stock issuance for acquisition
Scenario [Axis]
Document Information [Line Items]
Aggregate intrinsic value, exercisable
Contango Mining Canada Inc.
Contango Mining Canada Inc. [Member]
Segment Reporting, Expense Information Used by CODM, Description
Segment reporting, expense information used by CODM, description
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Segments [Axis]
Long-Lived Tangible Asset [Domain]
Total Exploration Expense
Total exploration expense.
Total exploration expense
Total exploration
Marketing Expense
Marketing and investor relations
Subsequent Events [Text Block]
Subsequent Events
Transaction costs paid as part of the Dolly Varden acquisition
Asset Acquisition, Consideration Transferred, Transaction Cost
Transaction costs paid as part of the Dolly Varden acquisition
Long-Term Debt
Debt, net
Total Debt, net
Related Party Transactions Disclosure [Text Block]
Related party transactions
Related Party Transactions
Cash
Stock-based compensation
Variable Rate [Domain]
Derivative Contract Liability, Noncurrent [Member]
Derivative contract liability, noncurrent.
Balance
Balance
us-gaap_StockholdersEquity
TOTAL STOCKHOLDERS' EQUITY
Preferred Stock, Par or Stated Value Per Share
Preferred stock, par value (in dollars per share)
Derivatives Not Designated as Hedging Instruments [Table Text Block]
Statement of Stockholders' Equity [Abstract]
Net recognized asset
Net recognized asset
Issuance paid
Issuance paid
Marketable Security, Gain (Loss)
Marketable Security, Gain (Loss), Total
Gain/(loss) on marketable securities
Equity Method Investments
Investment balance
Investment balance
Investment in Peak Gold (Note 5)
Investment in Peak Gold, LLC
Series A Preferred Stock [Member]
Series A Special Voting Preferred Stock [Member]
Equity Method Investment [Table]
Avidian Gold Corp. [Member]
Avidian Gold Corp [Member]
Avidian Gold Corp.
Avidian Acquisition [Member]
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment, Total
Property & equipment, net
Treasury Stock, Common [Member]
Treasury Stock [Member]
Cash distributions received.
Cash distributions received
April 30, 2025
April Thirty Two Thousand Twenty Five Hedge [Member]
April 30 2025 hedge.
Avidian Gold Alaska Inc.
Avidian Gold Alaska Inc. [Member]
Fair Value Disclosures [Text Block]
Fair Value Measurement
Business Combination, Consideration Transferred [Abstract]
Consideration:
Cash Distributions from the Joint Venture Company
Cash distributions from joint venture company.
Cash Distributions From Joint Venture Company [Policy Text Block]
Alaska Hard Rock Lease [Member]
Represents information pertaining to the Alaska Hard Rock lease.
Income tax disclosure.
Income Tax Disclosure [Table]
us-gaap_DepreciationNonproduction
Depreciation
Commission Fee, Percentage of Gross Proceeds of Shares Sold, Maximum
ctgo_CommissionFeePercentageOfGrossProceedsOfSharesSoldMaximum
Represents maximum amount of commission fee as percentage of gross proceeds of shares sold.
CORE Alaska, LLC.
CORE Alaska, LLC [Member]
Project [Axis]
President and CEO [Member]
Represents president and chief executive officer.
President and Chief Executive Officer [Member]
Debt Instrument, Name [Domain]
Non-cash investing and financing activities
Noncash Investing and Financing Items [Abstract]
SOFR Adjustment [Member]
Represents SOFR Adjustment.
us-gaap_IncomeLossFromEquityMethodInvestments
Loss from equity investment in Peak Gold, LLC (Note 5)
Income from equity investment in Peak Gold, LLC
Equity earnings from investment in Peak Gold, LLC
Income from equity investment in Peak Gold, LLC
Acquisition date
Business Combination, Effective Date of Acquisition
Derivative Contract Liability, Current [Member]
Derivative contract liability, current.
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Awards granted August 18, 2023.
Awards Granted August 18 2023 [Member]
Awards Granted August 18, 2023 [Member]
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]
Debt Instrument, Interest Paid in Shares, Percentage
ctgo_DebtInstrumentInterestPaidInSharesPercentage
Represents interest paid in shares, percentage.
Fair Value Of Exchangeable Shares Of Common Stock Issued
Fair value of exchangeable shares of common stock issued.
Fair value of exchangeable shares of common stock issued
Plan Name [Domain]
Production Threshold, Two [Member]
Represents the second production threshold.
Commodity Contract 2024 [Member]
Commodity contract 2024.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Entity [Domain]
Represents stock issued during period, shares, debt establishment fee.
Stock Issued During Period Shares Debt Establishment Fee
Stock Issued During Period, Shares, Debt Establishment Fee (in shares)
Credit Facility [Axis]
Equity Method Investment, Ownership Percentage
us-gaap_EquityMethodInvestmentOwnershipPercentage
Percentage of investment in equity affiliate
Equipment and extinguishing the outstanding
Equipment and extinguishing the outstanding
Class of Warrant or Right, Outstanding (in shares)
Class of Warrant or Right, Outstanding
Related and Nonrelated Parties [Axis]
Percentage of taxable income to NOLs.
Percentage of Taxable Income to NOLs
Percentage of taxable income to NOLs
Entity Address, City or Town
Range Between March and September 2026 [Member]
Maturity Range Between March and September 2026 [Member]
Maturity range between march and september 2026.
Note 14 - Derivatives and Hedging Activities - Derivatives Not Designated as Hedging (Details)
Royal Gold [Member]
Represents information pertaining to Royal Gold, Inc.
Cash payable due on closing
Payments for Participation Liabilities
Schedule of liquidity.
Schedule Of Liquidity [Line Items]
Number of Reportable Segments
Number of reportable segments
Security Exchange Name
Royalty reimbursement advance current
Royalty reimbursement advance current.
Royalty reimbursement advance
Credit Facility [Domain]
Exchangeable shares issuance for acquisitions
ExchangeableSharesIssuanceForAcquisitions
Exchangeable shares issuance for acquisition
Agreement date
Business Combination, Date of Acquisition Agreement
Property, plant and equipment, gross
Counterparty Name [Axis]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Loss before income taxes
State of Alaska Mining Claims and Leases [Member]
State of alaska mining claims and leases.
Gain (Loss) on Disposition of Other Assets
Gain/(loss) on Spot sales
Gain on metal sales
Share-Based Payment Arrangement, Employee [Member]
Stockholders' Equity Note [Abstract]
Stock purchase agreement date
Repurchase Agreement, Date
Interest expense
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table]
Statistical Measurement [Domain]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
Amount of unrealized and realized gain (loss) recognized in other income (expense)
Notes To Financial Statements [Abstract]
Total current assets
us-gaap_AssetsCurrent
Share-Based Payment Arrangement, Expense
us-gaap_AllocatedShareBasedCompensationExpense
The equity interest of other holders in equity method investment.
Equity Method Investment, Ownership Percentage by Other Owner
ctgo_EquityMethodInvestmentOwnershipPercentageByOtherOwner
Document Period End Date
Silver royalty.
Silver Royalty [Member]
State of Alaska mining claims, leasehold locations and upland mining lease located in Fairbanks Mining District [Member]
State of Alaska mining claims, leasehold locations and upland mining lease located in Fairbanks Mining District [Member]
State of Alaska Mining Claims, Leasehold Locations And Upland Mining Lease Located In Fairbanks Mining District [Member]
Title and Position [Axis]
Fair Value Hierarchy and NAV [Domain]
Gain (losses) on metal sales
Gain (losses) on metal sales.
Gain Losses On Metal Sales
Exercisable, end of the period (in shares)
Annual Lease Fee Percent
Annual lease fee percent.
Annual lease fee percent
Exploration expense
Exploration expense
Exploration
Statement of Financial Position [Abstract]
Prepayment received pursuant to purchase agreement.
Prepayment received pursuant to purchase agreement
Lease agreement payment obligation term
Lease agreement payment obligation term.
Lease Agreement Payment Obligation Term
Amount Due on Purchase
Amount due on purchase
Amount due on purchase
Vesting [Axis]
Class of Stock [Axis]
Prepaid expenses and other.
Prepaid Expenses and Other [Abstract]
Debt Instrument, Unused Borrowing Capacity, Amount
us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Kitsault Valley Project [Member]
Kitsault Valley Project.
Asset Acquisition, Contingent Consideration Arrangements, Production Threshold, Output, Gold (Ounce)
ctgo_AssetAcquisitionContingentConsiderationArrangementsProductionThresholdOutputGold
The amount of gold are produced or received by the acquiror pursuant to the contingent consideration arrangements.
Net recognized liability
Net recognized liability
Not Designated as Hedging Instrument [Member]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
TOTAL LIABILITIES
us-gaap_Liabilities
Total Liabilities
Total Liabilities
Contingent payment
contingent Payment
Contingent payment.
Derivative Nonmonetary Notional Amount Mass Remaining Balance
Derivative nonmonetary notional amount mass remaining balance.
Derivative, Nonmonetary Notional Amount Remaining Balance, Mass (Ounce)
Promissory note
Promissory note
Payment For Settle Carry Trade
Payment for settle carry trade.
Payment for settle carry trade
Asset retirement obligations
us-gaap_AssetRetirementObligationsNoncurrent
Regulatory fees.
Regulatory Fees
Regulatory fees
Scenario 3 [Member]
Represents information that would apply under the third scenario mentioned.
Derivative Instruments, Gain (Loss) [Line Items]
Credit Agreement [Member]
Represents the Credit Agreement.
Restricted Stock [Member]
Restricted Shares [Member]
August 18, 2023 [Member]
Represents August 18, 2023.
Variable Rate [Axis]
JT Mining, Inc.
JT Mining, Inc. [Member]
Weighted Average Shares, diluted (in shares)
us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Weighted Average Number of Shares Outstanding, Diluted, Total
Weighted average number of shares outstanding, diluted
Entity File Number
Derivative Instruments, Gain (Loss) [Table Text Block]
Basis of Accounting [Text Block]
Basis of Presentation
Executives and Non-executive Directors [Member]
Represents information pertaining to executives and non-executive directors.
Purchase Amount
Purchase amount.
Purchase amount
Decrease in accounts payable and accrued liabilities
(Decrease)/increase in accounts payable and accrued liabilities
Percentage of Remaining Life of Mine Production
Percentage of remaining life of mine production.
Percentage of remaining life of mine production
Business Combination, Recognized Liability Assumed, Other Liability, Current
Liability on flow-through share issuances
Liability on flow-through share issuances
Derivative, Gain (Loss) on Derivative, Net
Derivative, Gain (Loss) on Derivative, Net, Total
Amount of realized gain (loss) recognized in other income (expense)
Realized loss on derivative contracts
Warrant exercise price
Warrant Exercise Price
Warrant Exercise Price
Initial Term of Leases and Concessions on Undeveloped Acreage (Year)
InitialTermOfLeasesAndConcessionsOnUndevelopedAcreage
Represents the initial term of leases and concessions on undeveloped acreage.
Scenario [Domain]
State of Alaska Mining Claims Located Near Triple Z Property [Member]
Represents the State of Alaska mining claims located near Triple Z Property.
The entire disclosure for components of general and administrative expenses.
General and Administrative Expenses [Text Block]
General and Administrative Expenses
Derivatives, Methods of Accounting, Derivatives Not Designated or Qualifying as Hedges [Policy Text Block]
Non-designated Hedges
Number of Operating Segments
Number of operating segments
Sale of Stock [Domain]
Contractual annual exploration costs payment deferral period.
Contractual Annual Exploration Costs Payment Deferral Period
Contractual annual exploration costs payment deferral period
Segment Reporting Disclosure [Text Block]
Segments
General and administrative
us-gaap_GeneralAndAdministrativeExpense
Total
General and administrative
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Corporate and Other Reconciling Items [Member]
Nonvested Restricted Stock Shares Activity [Table Text Block]
Schedule of Unvested Restricted Stock
Contingent consideration liability - noncurrent
Contingent consideration liability
Contingent consideration liability
Issuance of common stock from acquisitions, (in shares)
Stock Issued During Period, Shares, Acquisitions
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares)
Proceeds from issuance of common stock and warrant net.
Proceeds from Issuance of Common Stock and warrant Net
Cash proceeds from common stock and warrant issuance, net
State of alaska located near tidewater.
State of Alaska located near tidewater [Member]
State of Alaska Located Near Tidewater [Member]
Subsequent Event [Table]
Derivative Assets (Liabilities), at Fair Value, Net
Derivative Assets (Liabilities), at Fair Value, Net, Total
Derivative Assets (Liabilities), at Fair Value, Net
Note 15 - Fair Value Measurement - Summary of Fair Value (Details)
Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table]
Debt Instrument, Convertible, Conversion Price (in dollars per share)
us-gaap_DebtInstrumentConvertibleConversionPrice1
Lease agreement obligation final payment amount.
Lease Agreement Obligation Final Payment Amount
Lease agreement obligation final payment amount
Gold Discount Percentage
Gold discount percentage.
Gold discount percentage
Gross amount offset, liability
us-gaap_DerivativeLiabilityFairValueGrossAsset
Roll-forward of Equity Method Investment [Table Text Block]
Tabular disclosure of the roll-forward of an equity method investment.
Estimated useful life (Year)
Estimated useful life
New Accounting Pronouncements, Policy [Policy Text Block]
Recently Issued Accounting Pronouncements
Other Director or Officer [Member]
Other Director or Officer [Member]
Other director or officer, member.
Derivative Instruments, Gain (Loss) [Table]
Gain (Loss) on Disposition of Assets
Gain (Loss) on Disposition of Assets, Total
Sale of gold
Stock issued for convertible note interest payment (in shares)
Shares issued for convertible debt interest payment (in shares)
Summarized Income Statement of Equity Method Investment [Table Text Block]
Tabular disclosure of the summarized income statement of an equity method investment.
Ownership [Axis]
Royal Alaska, LLC.
Royal Alaska, LLC [Member]
State of alaska mining claims and upland mining leases.
State of Alaska mining claims and upland mining leases [Member]
State of Alaska Mining Claims and Upland Mining Leases [Member]
Payment of Financing and Stock Issuance Costs
Payment of Financing and Stock Issuance Costs, Total
Underwriting discounts and offering expenses
Depreciation expense
Sales Agreement [Member]
Represents sales agreement.
Proceeds from Issuance of Long-Term Debt
Cash proceeds from debt
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Compensation Amount
Compensation amount
Common Stock, Shares, Outstanding (in shares)
Common stock, shares outstanding (in shares)
Common Stock, Shares, Outstanding, Ending Balance
Common Stock, Shares, Outstanding, Beginning Balance
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Document Transition Report
Deferred Tax Assets, Net
Deferred Tax Assets, Net, Total
Net deferred liability
Tabular disclosure of each detailed components of general and administrative expenses.
Schedule of Components of General and Administrative Expenses [Table Text Block]
Components of General and Administrative Expenses
Derivative Instrument Detail [Abstract]
Less: Accumulated impairment
us-gaap_AssetImpairmentCharges
Cost of sales
Cost of Revenue, Total
Cost of Revenue
Cost of sales
Office and administrative costs.
Office and Administrative Costs
Office and administrative costs
Cash distribution received
Cash distribution received
Cash distribution from Peak Gold, LLC
Distributions received
Lucky Shot Alaska, LLC [Member]
Lucky Shot Alaska LLC [Member]
Lucky Shot Alaska, LLC.
Unrealized loss on derivative contracts
Unrealized loss on derivative contracts
Unrealized (gain)/loss from derivative contracts
Statement of Cash Flows [Abstract]
Net Smelter Returns Silver Royalty, Percent
ctgo_NetSmelterReturnsSilverRoyaltyPercent
The percent of net smelter returns silver royalty.
Common stock issuance
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
Summary of Stock Options
Commodity Contract 2027 [Member]
Commodity contract 2027.
Note 13 - Debt - Components of Debt (Details)
Equity [Text Block]
Stockholders' Equity
Contract Settlement Amount
Contract settlement amount.
Settlement amount
Earnings Per Share [Text Block]
Net Loss Per Share
NET LOSS
Net loss for the period
Net loss
Aggregate intrinsic value, outstanding
Due on Settlement of Withholding Contingency [Member]
Tranche two.
Tranche Two [Member]
Shares Repurchased For Tax Withholdings On Share Based Awards
Shares repurchased for tax withholdings on share based awards.
Shares repurchased for tax withholdings on share-based awards
Increase (Decrease) in Inventories
Increase (Decrease) in Inventories, Total
Increase in inventory
Debt disclosure.
Debt Disclosure [Line Items]
Four Employees [Member]
Four Employees.
Underwritten Offering - 2025 [Member]
Underwritten Offering - 2025 member.
Underwritten Offering - 2025 [Member]
Warrants exercisable term
Warrants and Rights Outstanding, Term
Income Taxes Receivable, Current
Income taxes receivable
Cantor Fitzgerald & Co. [Member]
Represents Cantor Fitzgerald & Co..
Awards Granted February 7, 2023 [member]
Relating to awards granted February 7, 2023.
Liquidity Facility [Member]
Represents the liquidity facility.
Derivatives, Fair Value [Line Items]
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Increase in prepaid expenses and other
Amortization of Debt Issuance Costs and Discounts
Amortization of debt discount and debt issuance fees
Document Fiscal Year Focus
Chief Financing Officer and Secretary [Member]
Chief Financing Officer And Secretary [Member]
Chief Financing Officer and Secretary.
CASH FLOWS FROM INVESTING ACTIVITIES:
Accounts payable
Accounts payable
Joint Venture Company [Member]
Joint Venture Company
Peak Gold JV [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value
Fair value of replacement options
Unsecured Convertible Debenture [Member]
Represents unsecured convertible debenture.
Adjusted Term SOFR [Member]
Represents Adjusted Term SOFR.
Royalty value greater than amount.
Royalty value greater than amount
Fair Value Disclosures [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Issuance of common stock from acquisitions
Stock Issued During Period, Value, Acquisitions
Tetlin Lease and Certain Other Properties [Member]
Represents information pertaining to the Tetlin Lease and certain other properties.
The 2010 Plan [Member]
Represents information pertaining to the Contango ORE, Inc. Equity Compensation Plan, adopted by the Board of Directors on September 15, 2010.
Dolly Varden Silver Corporation [Member]
Dolly Varden Silver Corporation.
Dolly Varden Silver Corporation [Member]
Sale of Stock, Consideration Received on Transaction
us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net loss attributable to common stockholders
Initial purchase price under stock purchase agreement.
Initial Purchase Price Under Stock Purchase Agreement
Initial purchase price
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less)
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), Total
Investment balance at March 31, 2026
Long-Term Line of Credit
Long-Term Line of Credit, Total
Outstanding term loan facility
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accrued Liabilities
Business combination recognized identifiable assets acquired and liabilities assumed current liabilities accrued liabilities.
Accrued liabilities
Debt Instrument [Axis]
Derivative Instrument [Axis]
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable
us-gaap_AssetAcquisitionConsiderationTransferredEquityInterestIssuedAndIssuable
Asset acquisition, consideration in shares
Share-Based Payment Arrangement [Abstract]
Sale of Stock [Axis]
Business Combination, Recognized Liability Assumed, Deferred Tax Liability
Defered income tax liability
Deferred income tax liability
Debt Instrument, Fair Value Disclosure
us-gaap_DebtInstrumentFairValue
Equity Method Investments and Joint Ventures Disclosure [Text Block]
Investment in the Peak Gold JV
Revenues
Revenues, Total
Flow-Through Shares
Flow Through Shares [Policy Text Block]
Disclosure of accounting policy for flow-through shares.
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash provided by investing activities
Title of 12(b) Security
Schedule of Segment Reporting Information, by Segment [Table]
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Derivatives and Hedging Activities
Related and Nonrelated Parties [Domain]
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
Income Tax Disclosure [Text Block]
Income Taxes
Issuance of warrants
Stock Issued During Period Value Warrants Issuance
Stock issued during period value warrants issuance.
Collaborative Arrangement and Arrangement Other than Collaborative [Table]
Fair value measure of vested portion of replaced options considered part of acquisition cost.
Fair value measure of vested portion of replaced options considered part of acquisition cost
Document Information [Table]
Consolidated Entities [Axis]
Legal Entity [Axis]
Changes in operating assets and liabilities, net of acquisition:
Property, Plant and Equipment [Table Text Block]
Outstanding, weighted average exercise price (in dollars per share)
Outstanding, weighted average exercise price (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Income Tax Disclosure [Abstract]
Fair Value, Recurring and Nonrecurring [Table]
Maturity for Proceeds of Gold Hedge Settlements
Maturity for proceeds of gold hedge settlements.
Maturity for proceeds of gold hedge settlements
Business Combination [Text Block]
Acquisition
Unrecognized Tax Benefits, Ending Balance
us-gaap_UnrecognizedTaxBenefits
Additional Paid-in Capital [Member]
Initial consideration
Share Repurchase Program, Authorized, Amount
Trading Symbol
Property, Plant and Equipment Disclosure [Text Block]
Property & Equipment
Insurance
Insurance Tax
Related Party Transaction [Table]
ctgo_ClaimRentalExpense
Amount of claim rental expense.
Claim rental
Claim rental
Subsequent Event Type [Axis]
Replacement options issuance for acquisitions
ReplacementOptionsIssuanceForAcquisitions.
Replacement options issuance for acquisition
CASH FLOWS FROM FINANCING ACTIVITIES:
Schedule of Equity Method Investments [Line Items]
Business combination consideration to be paid upon settlement of withholding contingency.
Business Combination Consideration To Be Paid Upon Settlement Of Withholding Contingency
Shares to be paid upon settlement of withholding contingency
Equity Components [Axis]
Gold Fee Percentage
Gold fee percentage.
Gold fee percentage
Total other income/(expense)
us-gaap_NonoperatingIncomeExpense
Capitalized deferred acquisition costs
Capitalized Deferred Acquisition Costs
Capitalized deferred acquisition costs.
Equity Component [Domain]
Price per pre-funded warrant
Price per Pre-Funded Warrant
Price per pre-funded warrant.
Volume (Ounce)
Derivative, Nonmonetary Notional Amount, Mass (Ounce)
us-gaap_DerivativeNonmonetaryNotionalAmountMass
Shares forfeited for employee taxes (in shares)
Stock Issued During Period Shares Forfeited For Employee Taxes
Stock issued during period shares forfeited for employee taxes.
Shares forfeited for employee taxes (in shares)
Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block]
Summary of Fair Value of the Consideration and the Allocation to the Net Assets Acquired
Senior Secured Loan Facility [Member]
Represents senior secured loan facility.
Business Combination [Axis]
Restricted stock activity (in shares)
Restricted shares activity (in shares)
Machinery and Equipment [Member]
Building and Building Improvements [Member]
Number of shares available to trade
Number of shares available to trade
Number of shares available to trade.
Equity Method Investment, Nonconsolidated Investee [Axis]
Maximum [Member]
Maximum [Member]
Designated as Hedging Instrument [Member]
Production Threshold, One [Member]
Represents the first production threshold.
Statistical Measurement [Axis]
Prepaid Expense, Current
Prepaid expenses and other
Prepaid expenses and other
COMMON
Common Stock
Common Stock
General exploration expenses
General exploration expenses.
General exploration
us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Net loss attributable to common stock, diluted
Derivative Asset, Current
Derivative contract asset
Derivative contract asset - current
July Thirty First Two Thousand Twenty Five Hedge [Member]
July 31 2025 hedge.
July 31, 2025
Omnibus royalty agreement.
Omnibus Royalty Agreement [Member]
Gain (Loss) on Sale of Derivatives
Loss on derivative contracts
Drawdown of Silver Royalty
Drawdown of silver royalty.
Drawdown of silver royalty
Payment that Lessor May Pay to Lessee to Increase Royalty Rate
ctgo_PaymentThatLessorMayPayToLesseeToIncreaseRoyaltyRate
Represents the amount of payment that the lessor may make to the lessee in order to increase the royalty rate by a specified percentage.
HighGold acquisition.
HighGold Acquisition [Member]
HighGold Acquisition [Member]
Preferred Stock, Shares Authorized (in shares)
us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares authorized (in shares)
Two Executives [Member]
Represents information pertaining to two executives of the company.
Total expenses
Total expenses
us-gaap_CostsAndExpenses
Expense
Expense
Schedule of Debt [Table Text Block]
Valdez creek mining district on eastern edge of alaska range.
Valdez Creek Mining District on eastern edge of Alaska Range [Member]
Valdez Creek Mining District on Eastern Edge of Alaska Range [Member]
Related Party Transaction [Line Items]
Business Combination [Table]
Entity Registrant Name
Debt Disclosure [Text Block]
Debt
Class Of Prefunded Warrant Or Right Outstanding
Class of prefunded warrant or right outstanding.
Class of Pre-funded Warrant or Right, Outstanding (in shares)
Underwritten Offering - 2026 [Member]
Underwritten Offering - 2026.
Underwritten Offering - 2026 [Member]
Debt Instrument, Periodic Payment, Principal
Principal repayments
Income Tax Disclosure.
Income Tax Disclosure [Line Items]
Royalty reimbursement advance received pursuant to purchase agreement
Royalty reimbursement advance received pursuant to purchase agreement.
Other Nonoperating Income (Expense), Total
Other Nonoperating Income (Expense)
Other expenses
Subsequent Events [Abstract]
State of Alaska Mining Claims Located Near Eagle/Hona Property [Member]
Represents the State of Alaska mining claims located near Eagle/Hona Property.
One Big Beautiful Bill Act Description
One Big Beautiful Bill Act, description
One big beautiful bill act, description
Consolidated Entities [Domain]
Awards granted August 18, 2023 and October 10, 2023.
Awards Granted August 18, 2023 and October 10, 2023 [Member]
Awards Granted August 18, 2023 and October 10, 2023 [Member]
Income Tax Expense (Benefit), Total
Income tax (benefit) expense
Income tax (benefit) expense
Income tax (expense) / benefit
Fair value measure of vested portion of replaced options treated as post combination expense.
Fair value measure of vested portion of replaced options treated as post combination expense
Gross proceeds
Proceeds from Issuance of Common Stock
Investment Company [Abstract]
Business Combination, Contingent Consideration, Type [Axis]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Subsidiary, Ownership Percentage, Noncontrolling Owner
Shareholders ownership percentage in combined company
Entity Common Stock, Shares Outstanding
Consolidation Items [Axis]
KG Mining [Member]
Related to KG Mining.
Amended Equity Plan [Member]
Represents information relating to the amended and restated 2010 Equity Compensation Plan.
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Restricted shares granted
TOTAL ASSETS
us-gaap_Assets
Total Assets
Inventory, Policy [Policy Text Block]
Inventory
Property, Plant and Equipment [Table]
Income Statement [Abstract]
Deferred Income Tax Expense (Benefit)
Deferred Income Tax Expense (Benefit), Total
Deferred tax (benefit)/expense
HighGold Mining Inc.
HighGold Mining Inc. [Member]
Stock Issued During Period, Shares, New Issues (in shares)
Common stock issuance (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)
Restricted shares vested
Restricted shares vested
Business Combination [Abstract]
us-gaap_EarningsPerShareDiluted
Earnings Per Share, Diluted, Total
Net loss per share, diluted
Loss Per Share, diluted (in dollars per share)
President and Director [Member]
President and director.
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule of Segment Information
Operating Segments [Member]
Operating Segments [Member]
Title and Position [Domain]
Asset Acquisition [Axis]
City Area Code
Valdez Creek Mining District [Member]
Valdez creek mining district.
Royalty Rate
ctgo_RoyaltyRate
Represents the royalty rate required to be paid under an agreement.
Computer and Office Equipment [Member]
Related to computer and office equipment.
Principal payment
Debt Instrument, Face Amount
Principal amount
Contango Minerals [Member]
Related to Contango Minerals.
Line of Credit Facility, Maximum Borrowing Capacity
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Business Combination [Line Items]
Business Acquisition [Line Items]
Debt Instrument, Covenant, Redeemable, Percentage of Par
ctgo_DebtInstrumentCovenantRedeemablePercentageOfPar
Represents the percentage of par related to redeemable debt instrument based on market price of common stock being at least 130%.
Note To Financial Statement Details Textual
Note To Financial Statement Details Textual
Counterparty Name [Domain]
Percentage of Outstanding Shares
Percentage of utstanding shares.
Segment Reporting Information [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio
Exchange ratio
Number of Exchangeable Shares Outstanding
Number of exchangeable shares outstanding.
Exchangeable shares outstanding (in shares)
Gross Liability
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash and Cash Equivalents
Proceeds from Equity Method Investment, Distribution
Distributions received from Peak Gold, LLC
Equity method investment, cash distributions received
Distributions received
Business Combination, Consideration Transferred, Equity Interest
Total equity value
Fair value of shares of common stock issued, calculated as 13,686,278 shares of common stock issued at a fair value of $16.69/share
SchSchedule of liquidity.
Schedule Of Liquidity [Table]
Derivative Liability, Current
Derivative contract liability
Derivative contract liability - current
Property & equipment, net
Property & equipment, net
Property & Equipment, net
Tetlin Lease [Member]
Represents information pertaining to the Tetlin lease.
Restricted stock activity
Restricted shares activity
State of Alaska Mining Claims Located in Richardson District [Member]
Represents the State of Alaska mining claims located in Richardson District.
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD
Operating Income (Loss)
Total income from operations
Interest in Projected Production, Percentage
ctgo_InterestInProjectedProductionPercentage
Amount of interest in projected production as percentage.
Retained Earnings [Member]
Accumulated Deficit [Member]
Business Combination, Contingent Consideration, Type [Domain]
Deferred tax liability on acquisition of exploration and evaluation assets.
Deferred tax liability on acquisition of exploration and evaluation assets
Alaska Hardrock Inc [Member]
Alaska Hardrock Inc [Member]
Alaska Hardrock Inc.
Mining Properties and Mineral Rights [Member]
Stock-based compensation
us-gaap_ShareBasedCompensation
Share-Based Payment Arrangement, Noncash Expense, Total
Stock-based compensation
Net income loss per share.
Net Income Per Share [Line Items]
Net Loss Per Share [Line Items]
Total non-current liabilities
us-gaap_LiabilitiesNoncurrent
Lease payable
Operating Lease, Liability, Noncurrent
Fair Value, Inputs, Level 1 [Member]
Class of Stock [Line Items]
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by/(used in) financing activities
Debt disclosure.
Debt Disclosure [Table]
Replacement Options [Member]
Replacement options.
Deferred Income Tax Liabilities, Net
Deferred tax liability
Secured Debt [Member]
Secured Credit Facility [Member]
OTHER INCOME/(EXPENSE):
Derivative contract liability
Derivative contract liability
Derivative contract liability - noncurrent
Derivative Contract [Domain]
Asset Acquisition Contingent Consideration Payable
Asset acquisition contingent consideration payable.
Asset Acquisition, Contingent Consideration Payable
Income Tax Jurisdiction [Domain]
Proceeds from Issuance of Common Stock, Net
ctgo_ProceedsFromIssuanceOfCommonStockNet
The net cash inflow from the additional capital contribution to the entity.
Entity Interactive Data Current
CASH FLOWS FROM OPERATING ACTIVITIES:
Furniture and Fixtures [Member]
Interest expense paid in stock
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares
Shares issued
Entity Tax Identification Number
Repurchase Agreements and Similar Transactions, Maturity Periods [Domain]
Land [Member]
Share Price
Share Price (in dollars per share)
Share of gold percentage purchased to physically deliver gold as stipulated in hedge agreement.
Share of gold percentage purchased to physically deliver gold as stipulated in hedge agreement
Long-Term Debt, Type [Axis]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Organization and Business
Marketable Security, Unrealized Gain (Loss)
Unrealized gain/(loss) on marketable securities
Unrealized (gain)/loss from marketable securities
Represents maximum percentage of shares transferable without notifying in advance.
Investor Right Agreement Maximum Percentage Of Shares Transferable Without Notifying In Advance
Investor Right Agreement, Maximum Percentage of Shares Transferable without Notifying in Advance
Tranche one.
Tranche One [Member]
Deposit [Member]
Capital raises for net proceeds
Proceeds from Issuance or Sale of Equity
Proceeds from Issuance or Sale of Equity, Total
Local Phone Number
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount
Accrued transaction costs for acquisition
Accrued transaction costs for acquisition.
HighGold acquisition 1.
HighGold Acquisition 1 [Member]
Highgold Acquisition [Member]
Shares Repurchased During Period Shares For Tax Withholdings On Share Based Awards
Shares repurchased during period shares for tax withholdings on share based awards.
Shares repurchased for tax withholdings on share-based awards (in shares)
Debt issuance costs
us-gaap_PaymentsOfFinancingCosts
Fair Value of Exchangeable Shares Issued
Fair Value of Exchangeable Shares Issued
Fair value of exchangeable shares issued, calculated as 1,597,301 exchangeable shares of common stock issued at a fair value of $16.69/share
Balance Remaining from Sales Agreement
Balance remaining from sales agreement.
Balance remaining from sales agreement
Cost of common stock issuance
us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Cash Acquired from Acquisition
Cash acquired as part of the Dolly Varden acquisition
Accounting Policies [Abstract]
Reduction Of Derivative Nonmonetary Notional Amount Mass
Reduction of derivative nonmonetary notional amount mass.
Reduction of derivative nonmonetary notional amount, (Ounce)
Insurance recoveries
Insurance Recoveries
The fair value of investing activities assumed in noncash investing or financing activities.
Total non-cash investing and financing activities:
Total non-cash investing and financing activities
General and Administrative Expense [Abstract]
Percentage of Ownership Purchase
Percentage of Ownership Purchase
Percentage of ownership purchase.
Class of Stock [Domain]
Kitsault Valley Property [Member]
Kitsault Valley Property.
Kitsault Valley Project [Member]
The percentage of base salary to be paid if minimum performance target is met under the short term incentive plan.
ctgo_ShortTermIncentivePlanMinimumPerformanceTargetPayoutPercentageOfBaseSalary
Short Term Incentive Plan, Minimum Performance Target, Payout, Percentage of Base Salary
Labor and Related Expense
Salaries and benefits
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)
Available for grant, end of period (in shares)
Stock, Class of Stock [Table]
Entity Emerging Growth Company
CIRI.
C I R I [Member]
CIRI [Member]
Area of Land (Acre)
us-gaap_AreaOfLand