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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Summary of Operating Results from MSC (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales	$ 37,129	$ 27,395	$ 101,575	$ 77,086
Depreciation and depletion	(6,025)	(4,570)	(16,677)	(16,080)
Gross Profit	344	(701)	(583)	(13,261)
Other expenses				(1,968)
Net income before tax	(18,242)	(9,930)	(39,734)	(130,059)
Net income (loss)	(17,401)	(9,778)	(35,856)	(128,783)
Income tax recovery	841	152	3,878	1,276
Loss from investment in MSC, net of amortization	$ (2,650)	2,582	$ (5,077)	(1,139)
Subsidiary (as a percent)			100.00%
Ownership interest (as a percent)	49.00%		49.00%
Minera Santa Cruz S.A. [Member]
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales	$ 72,098	70,195	$ 195,797	154,666
Production costs applicable to sales	(47,911)	(41,512)	(125,167)	(100,230)
Depreciation and depletion	(11,690)	(7,107)	(28,422)	(22,084)
Gross Profit	12,498	21,576	42,209	32,352
Exploration	(2,710)	(2,814)	(7,887)	(7,855)
Other expenses	(8,010)	(6,509)	(28,231)	(17,651)
Net income before tax	1,777	12,253	6,091	6,846
Current and deferred tax expense	(2,336)	(4,922)	(5,902)	(2,989)
Net income (loss)	(559)	7,331	189	3,857
Net income (loss)			93		$ 2,745
Amortization of fair value increments			(5,571)		(5,390)
Income tax recovery			401		$ 1,128
Loss from investment in MSC, net of amortization	(2,650)	2,582	(5,077)	(1,139)
Other infrequent or unusual expenses	5,200		17,100
Minera Santa Cruz S.A. [Member] | Equity Method Investment
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net income (loss)	(273)	3,592	93	1,890
Amortization of fair value increments	(2,481)	(1,255)	(5,571)	(3,891)
Income tax recovery	$ 104	$ 245	$ 401	$ 862
Ownership interest (as a percent)	49.00%		49.00%

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Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

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