Equity Components [Axis] Common Stock [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Consolidated Entities [Axis] Owned Subsidiaries One [Member] Owned Subsidiaries Two [Member] Owned Subsidiaries Three [Member] Owned Subsidiaries Four [Member] Long-Lived Asset, Class [Axis] Computers Fixtures And Office Equipment [Member] Vehicles [Member] Software [Member] Land Improvements [Member] Leasehold Improvements [Member] Legal Entity [Axis] Lane F [Member] Cash and Cash Equivalents [Axis] Cash [Member] Reimbursement Of Costs In Cash [Member] Asset Acquisition [Axis] Montana Department Of Environmental Quality [Member] Jefferson County, Montana [Member] MTMI Shareholders [Member] Title and Position [Axis] Chief Executive Officer [Member] Award Type [Axis] Restricted Stock Units (RSUs) [Member] Warrant Exercises 2025 [Member] Sale of Stock [Axis] IPO [Member] Warrant Exercises 2026 [Member] Derivative Instrument [Axis] Equity Option [Member] Vested Stock Options [Member] Statistical Measurement [Axis] Minimum [Member] Maximum [Member] Warrant [Member] Performance Warrants [Member] Scenario [Axis] Forecast [Member] Intangible Asset, Finite-Lived, Class [Axis] Hennessery Building Lease [Member] Thornton Building Lease [Member] Counterparty Name [Axis] Ocean Partners [Member] Rainbow Block [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Debt Instrument [Axis] Pre Bridge Financing [Member] Cover [Abstract] Document Type Amendment Flag Amendment Description Document Registration Statement Document Annual Report Document Quarterly Report Document Transition Report Document Shell Company Report Document Shell Company Event Date Document Period Start Date Document Period End Date Document Fiscal Period Focus Document Fiscal Year Focus Current Fiscal Year End Date Entity File Number Entity Registrant Name Entity Central Index Key Entity Primary SIC Number Entity Tax Identification Number Entity Incorporation, State or Country Code Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Three Entity Address, City or Town Entity Address, State or Province Entity Address, Country Entity Address, Postal Zip Code Country Region City Area Code Local Phone Number Extension Written Communications Soliciting Material Pre-commencement Tender Offer Pre-commencement Issuer Tender Offer Title of 12(b) Security No Trading Symbol Flag Trading Symbol Security Exchange Name Title of 12(g) Security Security Reporting Obligation Annual Information Form Audited Annual Financial Statements Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Elected Not To Use the Extended Transition Period Document Accounting Standard Other Reporting Standard Item Number Entity Shell Company Entity Public Float Entity Bankruptcy Proceedings, Reporting Current Entity Common Stock, Shares Outstanding Documents Incorporated by Reference [Text Block] Statement of Financial Position [Abstract] ASSETS Current Assets Cash and cash equivalents Prepaid expenses Other current assets Total Current Assets Non-current Assets Restricted cash - reclamation deposit Right of use asset Property and equipment, net Deposits - Montana Tunnels Mining Inc. Mineral properties Total Assets LIABILITIES AND STOCKHOLDERS’ EQUITY Current Liabilities Accounts payable and accrued liabilities Lease liability - short term Short term obligation - Great Republic mineral property Total current liabilities Non-current Liabilities Environmental remediation reserve Lease liability - long term Long term obligation - Great Republic mineral property Total Liabilities  Commitments and Contingencies - Note 9 Stockholders’ Equity Common shares, no par value, unlimited shares authorized; 29,528,500 issued and outstanding at September 30, 2026 (December 31, 2025 - 24,143,500) Additional paid-in capital Accumulated deficit Total Stockholders’ Equity TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY Common Stock, No Par Value Common Stock, Shares, Issued Common Stock, Shares, Outstanding Income Statement [Abstract] Operating expenses Exploration costs Depreciation Salaries and wages General and administration Management and advisory fees Professional fees Operating lease expenses Net loss from operations Other (income) expenses Sub-lease income Foreign exchange (gain) loss Interest income Interest expense Other (income) expense Total other (income) expenses Net loss Net loss per share, basic Net loss per share, diluted Weighted average shares, basic Weighted average shares, diluted Statement [Table] Statement [Line Items] Beginning balance, value Beginning balance (in shares) Issuance of common shares, net of costs Issuance of common shares, net of costs (in shares) Warrant exercises Warrant exercises (in shares) Restricted stock units Restricted stock units (in shares) Issuance of common shares - acquisition settlement Issuance of common shares - acquisition settlement (in shares) Proceeds from IPO, net of issue costs Proceeds from IPO, net of issue costs (in shares) Stock-based compensation Net loss for the period Ending balance, value Ending balance (in shares) Statement of Cash Flows [Abstract] Cash flows provided by (used in): Net loss for period Adjustments to reconcile net loss to net cash used in operating activities: Stock-based compensation Depreciation expense Changes in operating assets and liabilities: Prepaid expenses Accounts payable and accrued liabilities Net change in operating lease assets and liabilities Other assets and liabilities, net Net cash flows used in operating activities Investing activities Asset purchase – Montana Tunnels Mining Inc. Acquisition of mineral rights - Great Republic Acquisition of mineral rights - Goldsmith Acquisition of Ferry Lane Purchase property and equipment Net cash flows used in investing activities Financing activities Warrant exercises Proceeds from issuance of common stock, net of costs Proceeds from IPO, net of costs Net cash flows provided by financing activities Net increase in cash and restricted cash Cash and restricted cash, beginning of year Cash and restricted cash, end of period Supplemental disclosure of noncash investing and financing activities Obligation for acquisition of Great Republic mineral property (see Note 6) Shares to be issued Lane F (see Note 6) Organization, Consolidation and Presentation of Financial Statements [Abstract] Nature of Operations Accounting Policies [Abstract] Basis of Presentation and Use of Estimates Significant Accounting Policies and Recently Issued Accounting Standards Investments, All Other Investments [Abstract] Financial Instruments Property, Plant, and Equipment [Abstract] Property & Equipment, (net) Extractive Industries [Abstract] Mineral Rights and Properties Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Pending Acquisition of Assets of Montana Tunnels Mining, Inc. Environmental Remediation Reserve And Reclamation Deposit Environmental Remediation Reserve and Reclamation Deposit Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Equity [Abstract] Stockholders’ Equity Share-Based Payment Arrangement [Abstract] Stock-based Compensation Operating Leases Operating Leases Earnings Per Share [Abstract] Net Loss per Share Segment Reporting [Abstract] Segment Information Subsequent Events [Abstract] Subsequent Events Schedule of wholly owned subsidiaries Schedule of property and equipment Schedule mineral rights and properties Schedule of remediation reserve and reclamation bond balances Schedule of total compensation expense recognized Schedule of stock options Schedule of activity related to restricted share units Schedule of warrant activity related to financing events Schedule of maturity analysis of future minimum lease payments for operating leases Entity name Incorporated Effective date Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Line Items] Total Property and Equipment Less: Accumulated Depreciation Total Property and Equipment (net) Beginning balance Additions during the year Ending balance Annual property tax payments Purchase price for certain patented mining claims Settlement consideration, asset purchase and release agreement Promissory note stated value Per share price for settlement of lane F promissory note Cash paid for settlement of lane F promissory note Common shares issued for settlement of lane F promissory note (shares) Common shares issued for settlement of lane F promissory note (value) Final cash payment of Lane F promissory note Accrued interest on lane F promissory note Payments to acquire lands and mineral rights Annual installments Annual accrual interest rate on installments Final balloon payment Asset Acquisition [Table] Asset Acquisition [Line Items] Escrow deposit Contingent value rights Deferred contingent value rights Amount receivable in exchange for secured notes Contingent value rights outstanding Payments to acquire mining assets Exclusivity fee paid Asset acquisition transaction costs Schedule Of Remediation Reserve And Reclamation Bond Balances Environmental remediation reserve Annual property tax payments Net smelter returns royalty percentage Net smelter returns royalty, buy-out price Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Subsidiary, Sale of Stock [Line Items] Proceeds from Issuance of Common Shares and Purchase Warrants Common shares issued Common share purchase warrants issued Warrant exercise price per share Expiry date RSUs granted to CEO Common Shares Issued Pursuant to Warrant Exercises Proceeds from warrant exercises and issuance of stock options Common shares issued in initial public offering Initial public offering price per common share Net proceeds from initial public offering Warrant Exercise Price Per Share Management and advisory fees Salaries and wages Professional fees Total stock-based compensation Stock options RSUs Warrants Total stock-based compensation Offsetting Assets [Table] Offsetting Assets [Line Items] Number of Stock Options Outstanding, Beginning Weighted Average Exercise Price, Beginning Weighted Average Contractual Life (Years) Number of Stock Options Outstanding, Granted Weighted Average Exercise Price, Granted Number of Stock Options Outstanding, Expired/ Forfeited Weighted Average Exercise Price, Expired/ Forfeited Number of Stock Options Outstanding, Beginning Weighted Average Exercise Price, Ending Number of Stock Options Outstanding, Exercisable Weighted Average Exercise Price, Exercisable Weighted Average Contractual Life (Years), Exercisable Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Weighted Average Grant Date Fair Value, Beginning Granted during the period Weighted Average Grant Date Fair Value, Granted Forfeited during the period Weighted Average Grant Date Fair Value, Forfeited Vested during the period Weighted Average Grant Date Fair Value, Vested Weighted Average Grant Date Fair Value, Ending Beginning Balance Beginning Exercise Price Issued Exercise Price Issued Exercised Exercise Price Exercised Expired Exercise Price Expired Beginning Balance Ending Exercise Price Intrinsic value Shares issued Exercise price Risk free rate Expected life Expected volatility Estimated share price Unvested stock options Unrecognized stock-based compensation Faire value price per share Granted Shares issued Vested Issuance of shares Common shares issued Warrants have vested Exercisable warrants shares Fair value Unvested warrants Schedule Of Maturity Analysis Of Future Minimum Lease Payments For Operating Leases 2027 2028 2029 Total operating lease payments Less: imputed interest Total operating lease liability Less: current portion of operating lease liability Non-current portion of operating lease liability Operating lease expense Total sub-lease income Rent and fees amount Operating lease discount rate Right of use asset and lease liability Operating lease right of use asset Operating lease liability Variable lease, cost Aggregate amount Subsequent Event [Table] Subsequent Event [Line Items] Approximate aggregate total for integrated funding and credit support Replacement surety bond guarantee Reclamation bond Surety bond amount Cash collateral released Ocean Partners prepayment facility description, subsequent event Pre-bridge financing Pre-bridge financing credited against initial tranche Investment in future equity financing The element represents environmental remediation reserve. The element represents sublease incomes. The element represents interest expenses. The element represents management and advisory fees. The element represents stock issued during period value warrant exercises. The element represents proceeds from initial public offering net of costs. The element represents stock issued during period shares warrant exercises. The element represents proceeds from initial public offering net of costs in shares. The element represents payments to acquire mineral rights great republic. The element represents payments to acquire mineral rights goldsmith. The element represents obligation for acquisition of great republic mineral property. The element represents shares to be issued lane f. The element represents schedule of wholly owned subsidiaries table text block. The element represents owned subsidiaries one member. The element represents owned subsidiaries two member. The element represents owned subsidiaries three member. The element represents owned subsidiaries four member. The element represents entity incorporation jurisdiction state country name. The element represents business effective date. The element represents computers fixtures and office equipment member. The element represents software member. The element represents annual property tax payments. The element represents payments to acquire mining properties and mineral rights. The element represents ocean partners member. The element represents reclamation bond. The element represents surety bond amount. The element represents rainbow block member. The element represents pre bridge financing member. The element represents pre bridge financing credited against initial tranche. The element represents future equity investment commitment amount. The element represents base rent and fixed common area maintenance fees. The element represents acquisition of purchase of ferry lane. The element represents promissory note stated value. The element represents lane f member. The element represents reimbursement of costs in cash member. The element represents per share price for promissory note settlement. The element represents cash paid for settlement of promissory note. The element represents common shares issued for promissory note settlement. The element represents common shares value issued for promissory note settlement. The element represents accrued interest expense. The element represents mineral properties table text block. The element represents mineral properties additions recovery. The element represents decommissioning provision and reclamation bond text block. The element represents montana department of environmental quality member. The element represents jefferson county montana member. The element represents contingent value rights. The element represents mtmi shareholders member. The element represents deferred contingent value rights. The element represents contingent value rights outstanding. The element represents exclusivity fee paid. The element represents asset acquisition transaction costs. The element represents schedule of environmental remediation liabilities and asset retirement obligations table text block. The element represents other maintenance and repair expense. The element represents net smelter returns royalty percentage. The element represents hennessery building lease member. The element represents thornton building lease member. The element represents schedule of total compensation expense recognized table text block. The element represents professional fee. The element represents sharebased compensation arrangement by sharebased payment award compensation type. The element represents vested stock options member. The element represents share based compensation arrangement by share based payment award nonvested awards total compensation cost not yet recognized. The element represents share based compensation arrangement by share based payment award options issued in period gross. The element represents share based compensation arrangement by share based payment award options expired in period gross. The element represents share based compensation arrangements by share based payment award options issue in period weighted average exercise price. The element represents share based compensation arrangements by share based payment award options exercised in period weighted average exercise price. The element represents share based compensation arrangements by share based payment award options expired in period weighted average exercise price. The element represents performance warrants member. The element represents warrants have vested. The element represents exercisable warrants shares. The element represents proceeds from issuance of common shares and purchase warrants. The element represents common share purchase warrants. The element represents expiry date. The element represents common share issued during period shares warrants exercised. The element represents warrant exercises 2025 member. The element represents warrant exercises 2026 member. The element represents management and advisory fee. The element represents final cash payment. Assets, Current Assets Liabilities, Current Liabilities Equity, Attributable to Parent Liabilities and Equity Operating Income (Loss) Sublease Incomes Gain (Loss), Foreign Currency Transaction, after Tax Interest Income, Other Interest Expenses Other Income Nonoperating Income (Expense) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Shares, Outstanding Share-Based Payment Arrangement, Noncash Expense Increase (Decrease) in Prepaid Expense Increase (Decrease) in Accounts Payable and Accrued Liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Increase (Decrease) in Other Current Assets and Liabilities, Net Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Payments To Acquire Mineral Rights Great Republic Payments To Acquire Mineral Rights Goldsmith Acquisition Of Purchase Of Ferry Lane Payments to Acquire Property, Plant, and Equipment Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Equity [Text Block] Lessee, Operating Leases [Text Block] Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Accrued Capping, Closure, Post-closure and Environmental Costs Other Maintenance And Repair Expense Management And Advisory Fee Salary and Wage, NonOfficer, Excluding Cost of Good and Service Sold Professional Fee Sharebased Compensation Arrangement By Sharebased Payment Award Compensation Type Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Option, Nonvested, Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares Lessee, Operating Lease, Liability, Undiscounted Excess Amount