INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Summary of Operating Results from MSC (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Revenue from gold and silver sales	$ 25,542	$ 23,740
Depreciation and depletion	(3,712)	(5,137)
Gross Profit	(5,994)	(4,986)
Exploration	(1,735)	(2,236)
Net income before tax	(21,878)	(14,481)
Net income (loss)	(19,327)	(12,466)
Income tax recovery	814	2,015
Loss from investment in MSC, net of amortization	$ (1,120)	(574)
Subsidiary (as a percent)	100.00%
Ownership interest (as a percent)	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	$ 39,207	53,303
Production costs applicable to sales	(31,789)	(36,367)
Depreciation and depletion	(6,896)	(6,953)
Gross Profit	522	9,983
Other expenses	(3,880)	(5,536)
Net income before tax	(5,093)	2,211
Current and deferred tax expense	3,807	(1,629)
Net income (loss)	(1,286)	582
Net income (loss)	(630)		$ 132
Amortization of fair value increments	(613)		(8,331)
Income tax recovery	123		$ 666
Loss from investment in MSC, net of amortization	(1,120)	(574)
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
Net income (loss)	(630)	285
Amortization of fair value increments	(613)	(1,071)
Income tax recovery	$ 123	$ 212
Ownership interest (as a percent)	49.00%