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Assets Held For Sale (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2022
Feb. 28, 2022
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets held for sale $ 10,298   $ 10,298   $ 11,558
Proceeds from assets held for sale     1,890 $ 0  
Regrind Mill          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from assets held for sale   $ 1,300      
Dual Pinion Ball Mill          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from assets held for sale 600        
Aggregate purchase price 6,300        
Non-refundable option payment 4,800        
Non-refundable payment due 900        
Equipment not in use | Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets held for sale 9,913   9,913   11,163
Mine equipment | Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets held for sale 115   115   125
Materials and supplies | Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets held for sale $ 270   $ 270   $ 270