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REVENUE - Revenue by Metal (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 1,474,199	$ 853,089	$ 606,850
Gold
Disaggregation of Revenue [Line Items]
Revenue	1,240,844	750,458	461,366
Silver
Disaggregation of Revenue [Line Items]
Revenue	183,378	92,260	115,640
Lead
Disaggregation of Revenue [Line Items]
Revenue	33,070	8,815	19,541
Zinc
Disaggregation of Revenue [Line Items]
Revenue	13,511	4,275	9,658
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 3,396	$ (2,719)	$ 645

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