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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Summary of Operating Results from MSC (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE                      
Revenue from gold and silver sales                 $ 136,541,000 $ 104,789,000 $ 117,019,000
Depreciation and depletion                 (23,798,000) (22,910,000) (24,753,000)
Gross Profit $ (5,897,000) $ 344,000 $ 4,059,000 $ (4,986,000) $ (13,687,000) $ (701,000) $ (8,875,000) $ (3,685,000) (6,480,000) (26,948,000) 8,986,000
Other expenses                   (1,968,000)  
Net income before tax                 (64,199,000) (153,715,000) (63,591,000)
Net income (loss)         $ (23,542,000) $ (9,778,000) $ (19,814,000) $ (99,191,000) (56,712,000) (152,325,000) (59,747,000)
Income tax recovery                 7,315,000 1,390,000 3,844,000
Loss from investment in MSC, net of amortization                 $ (7,533,000) (1,517,000) (8,754,000)
Subsidiary (as a percent)                 100.00%    
Ownership interest (as a percent) 49.00%               49.00%    
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]                      
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE                      
Net income (loss)                 $ 132,000 2,745,000 (2,097,000)
Amortization of fair value increments                 (8,331,000) (5,390,000) (9,448,000)
Income tax recovery                 666,000 1,128,000 2,791,000
Loss from investment in MSC, net of amortization                 (7,533,000) (1,517,000) (8,754,000)
Minera Santa Cruz S.A. [Member]                      
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE                      
Net income (loss)                 132,000 2,745,000  
Amortization of fair value increments                 8,331,000 5,390,000  
Income tax recovery                 (666,000) (1,128,000)  
Shutdown costs                 19,300,000 11,400,000  
Minera Santa Cruz S.A. [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]                      
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE                      
Revenue from gold and silver sales                 271,863,000 219,020,000 263,887,000
Production costs applicable to sales                 (196,033,000) (138,182,000) (159,915,000)
Depreciation and depletion                 (39,948,000) (29,809,000) (69,995,000)
Gross Profit                 35,882,000 51,029,000 33,977,000
Exploration                 (10,602,000) (10,446,000) (10,635,000)
Other expenses (1)                 (17,077,000) (30,515,000) (13,065,000)
Net income before tax                 8,203,000 10,068,000 10,277,000
Current and deferred tax expense                 (7,934,000) (4,466,000) (14,556,000)
Net income (loss)                 $ 269,000 $ 5,602,000 $ (4,279,000)
Ownership interest (as a percent) 49.00%               49.00%