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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sales, net $ 138,724 $ 125,196
Cost of sales:    
Production costs 80,949 72,234
Depreciation and amortization 27,226 15,996
Reclamation and remediation 801 219
Total cost of sales 108,976 88,449
Mine gross profit 29,748 36,747
Costs and expenses:    
General and administrative expenses 8,048 6,900
Exploration expenses 13,049 4,886
Restructuring expenses   2,423
Stock-based compensation 1,955 875
Realized and unrealized loss on zinc zero cost collar 170 3,000
Other expense, net 4,288 1,020
Total costs and expenses 27,510 19,104
Income before income taxes 2,238 17,643
Provision for income taxes 8,559 9,615
Net (loss) income $ (6,321) $ 8,028
Net (loss) income per common share:    
Basic net (loss) income per common share $ (0.07) $ 0.11
Diluted net (loss) income per common share $ (0.07) $ 0.11
Weighted average shares outstanding:    
Basic 88,368,250 75,301,253
Diluted 88,368,250 75,608,627
Oaxaca, Mexico    
Costs and expenses:    
Exploration expenses $ 4,244 $ 4,831
Michigan, USA    
Costs and expenses:    
Exploration expenses $ 8,805 $ 55