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Restatement of Financial Statements - Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Sales, net $ 24,878 $ 13,272 $ 48,460 $ 52,756
Cost of sales:        
Production costs 15,613 17,198 39,179 51,074
Depreciation and amortization 2,610 4,178 7,670 14,221
Reclamation and remediation 434 566 1,262 1,892
Total cost of sales 18,657 21,942 48,111 67,187
Mine gross profit (loss) 6,221 (8,670) 349 (14,431)
Costs and expenses:        
General and administrative expenses 1,205 1,293 2,993 2,975
Exploration expenses 990 944 2,211 2,374
Stock-based compensation 403 203 1,198 647
Other expense, net 7,337 5,175 16,952 14,246
Total costs and expenses 9,935 7,615 23,354 20,242
Loss before income taxes (3,714) (16,285) (23,005) (34,673)
Income tax provision (benefit) 941 (3,608) 1,455 10,686
Net loss $ (4,655) $ (12,677) $ (24,460) $ (45,359)
Net loss per common share:        
Basic net loss per common share (in dollars per share) $ (0.03) $ (0.14) $ (0.19) $ (0.5)
Diluted net loss per common share (in dollars per share) $ (0.03) $ (0.14) $ (0.19) $ (0.5)
Weighted average shares outstanding:        
Basic (in shares) 142,909,014 93,279,750 129,081,618 91,005,507
Diluted (in shares) 142,909,014 93,279,750 129,081,618 91,005,507
Mexico        
Costs and expenses:        
Exploration expenses $ 799 $ 767 $ 1,649 $ 1,850
Michigan, USA        
Costs and expenses:        
Exploration expenses $ 191 177 $ 562 524
As Previously Report        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Sales, net   13,272   52,756
Cost of sales:        
Production costs   17,198   51,074
Depreciation and amortization   4,178   14,221
Reclamation and remediation   566   1,892
Total cost of sales   21,942   67,187
Mine gross profit (loss)   (8,670)   (14,431)
Costs and expenses:        
General and administrative expenses   1,293   2,975
Stock-based compensation   203   647
Other expense, net   2,977   10,846
Total costs and expenses   5,442   16,867
Loss before income taxes   (14,112)   (31,298)
Income tax provision (benefit)   (3,617)   10,952
Net loss   $ (10,495)   $ (42,250)
Net loss per common share:        
Basic net loss per common share (in dollars per share)   $ (0.11)   $ (0.46)
Diluted net loss per common share (in dollars per share)   $ (0.11)   $ (0.46)
Weighted average shares outstanding:        
Basic (in shares)   93,279,750   91,005,507
Diluted (in shares)   93,279,750   91,005,507
As Previously Report | Mexico        
Costs and expenses:        
Exploration expenses   $ 767   $ 1,850
As Previously Report | Michigan, USA        
Costs and expenses:        
Exploration expenses   202   549
Restatement Impacts        
Costs and expenses:        
Other expense, net   2,198   3,400
Total costs and expenses   2,173   3,375
Loss before income taxes   (2,173)   (3,375)
Income tax provision (benefit)   9   (266)
Net loss   $ (2,182)   $ (3,109)
Net loss per common share:        
Basic net loss per common share (in dollars per share)   $ (0.03)   $ (0.04)
Diluted net loss per common share (in dollars per share)   $ (0.03)   $ (0.04)
Restatement Impacts | Michigan, USA        
Costs and expenses:        
Exploration expenses   $ (25)   $ (25)