Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Realized (loss) gain embedded derivative, net	$ (246)	$ 653	$ 204	$ 250
Unrealized (loss) gain embedded derivative, net	(232)	(103)	(48)	(232)
Total sales, net	29,029	26,435	87,133	61,105
Dore
Disaggregation of Revenue [Line Items]
Less: Treatment and refining charges	(21)	(67)	(112)	(212)
Total sales, net	1,651	2,306	7,347	7,175
Gold Dore
Disaggregation of Revenue [Line Items]
Total sales, net	1,634	1,495	6,816	5,155
Silver Dore
Disaggregation of Revenue [Line Items]
Total sales, net	38	878	643	2,232
Concentrate
Disaggregation of Revenue [Line Items]
Less: Treatment and refining charges	(2,307)	(5,795)	(8,098)	(14,930)
Total sales, net	27,856	23,579	79,630	53,912
Gold Concentrate
Disaggregation of Revenue [Line Items]
Total sales, net	8,709	5,211	22,904	13,894
Silver Concentrate
Disaggregation of Revenue [Line Items]
Total sales, net	6,179	6,857	19,443	14,638
Copper Concentrate
Disaggregation of Revenue [Line Items]
Total sales, net	2,447	2,911	9,547	6,470
Lead Concentrate
Disaggregation of Revenue [Line Items]
Total sales, net	3,641	3,501	8,641	8,730
Zinc Concentrate
Disaggregation of Revenue [Line Items]
Total sales, net	$ 9,187	$ 10,894	$ 27,193	$ 25,110

The amount of realized gain or loss on embedded derivative net.

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The amount of unrealized gain or loss on embedded derivative net.

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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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