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Segment Reporting (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Segment Reporting Information [Line Items]          
Number of operating segments | segment     2    
Number of reportable segments | segment     2    
Income statement information          
Sales, net $ 24,878 $ 13,272 $ 48,460 $ 52,756  
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  
Mining gross profit (loss) 6,221 (8,670) 349 (14,431)  
Exploration expenses 990 944 2,211 2,374  
G&A expenses, including Stock-based compensation 1,608 1,496 4,191 3,622  
Other segment items $ 7,337 $ 5,175 $ 16,952 $ 14,246  
Other segment item, description Please see Note 20—Other Expense, net in Item 1—Condensed Consolidated Interim Financial Statements and Notes (unaudited) for additional information. Please see Note 20—Other Expense, net in Item 1—Condensed Consolidated Interim Financial Statements and Notes (unaudited) for additional information. Please see Note 20—Other Expense, net in Item 1—Condensed Consolidated Interim Financial Statements and Notes (unaudited) for additional information. Please see Note 20—Other Expense, net in Item 1—Condensed Consolidated Interim Financial Statements and Notes (unaudited) for additional information.  
Income (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)  
Expenditures for long-lived assets 6,715 3,269 12,647 7,565  
Balance sheet information          
Total current assets 31,225   31,225   $ 16,580
Total non-current assets 133,114   133,114   129,294
Total assets 164,339   164,339   145,874
Oaxaca, Mexico          
Income statement information          
Exploration expenses 799 767 1,649 1,850  
Michigan, USA          
Income statement information          
Exploration expenses 191 177 562 524  
Operating Segments | Oaxaca, Mexico          
Income statement information          
Sales, net 24,878 13,272 48,460 52,756  
Production costs 15,613 17,198 39,179 51,074  
Depreciation and amortization 2,584 4,143 7,585 14,115  
Reclamation and remediation 434 566 1,262 1,892  
Mining gross profit (loss) 6,247 (8,635) 434 (14,325)  
Exploration expenses 799 767 1,649 1,850  
Other segment items 2,651 1,295 3,861 2,909  
Income (loss) before income taxes 2,797 (10,697) (5,076) (19,084)  
Expenditures for long-lived assets 6,715 3,269 12,647 7,565  
Balance sheet information          
Total current assets 22,002   22,002   16,073
Total non-current assets 43,181   43,181   38,926
Total assets 65,183   65,183   54,999
Capital investments 12,600   12,600   8,600
Operating Segments | Michigan, USA          
Income statement information          
Depreciation and amortization 26 28 78 83  
Mining gross profit (loss) (26) (28) (78) (83)  
Exploration expenses 191 177 562 524  
Other segment items 4,150 3,374 12,157 10,975  
Income (loss) before income taxes (4,367) (3,579) (12,797) (11,582)  
Balance sheet information          
Total current assets 18   18   50
Total non-current assets 89,398   89,398   90,328
Total assets 89,416   89,416   90,378
Capital investments 0   0   0
Corporate and Other          
Income statement information          
Depreciation and amortization   7 7 23  
Mining gross profit (loss)   (7) (7) (23)  
G&A expenses, including Stock-based compensation 1,608 1,496 4,191 3,622  
Other segment items 536 506 934 362  
Income (loss) before income taxes (2,144) $ (2,009) (5,132) $ (4,007)  
Balance sheet information          
Total current assets 9,205   9,205   457
Total non-current assets 535   535   40
Total assets 9,740   9,740   497
Capital investments $ 0   $ 0   $ 0