For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

The average forward price on the group of price risk forward or futures contracts, such as gas futures contracts.

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Nominal mass used to calculate payments on a derivative instrument.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Net fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as assets, net of those classified as liabilities.

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REVENUE - Narrative (Details) oz in Thousands, lb in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) lb oz $ / pound $ / ounce	Dec. 31, 2020 USD ($)	Dec. 31, 2019
Concentrate Metal Sales Agreement
Disaggregation of Revenue [Line Items]
Embedded derivative, fair value of embedded derivative \| $	$ (1.0)	$ (1.5)
Silver \| Concentrate Metal Sales Agreement
Disaggregation of Revenue [Line Items]
Notional ounce/tonnes \| oz	3,900
Average price per ounce/tonnes \| $ / ounce	23.49
Zinc \| Concentrate Metal Sales Agreement
Disaggregation of Revenue [Line Items]
Notional ounce/tonnes \| lb	6,330
Average price per ounce/tonnes \| $ / pound	1.46
Lead \| Concentrate Metal Sales Agreement
Disaggregation of Revenue [Line Items]
Notional ounce/tonnes \| lb	19,230
Average price per ounce/tonnes \| $ / pound	1.02
Customer Concentration Risk \| Revenue Benchmark \| Istanbul Gold Refinery \| Gold Dore
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	41.00%	24.00%
Customer Concentration Risk \| Revenue Benchmark \| CIBC \| Gold Dore
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	30.00%	45.00%	37.00%
Customer Concentration Risk \| Revenue Benchmark \| Bank of Montreal \| Gold Dore
Disaggregation of Revenue [Line Items]
Concentration risk, percentage		14.00%	17.00%
Customer Concentration Risk \| Revenue Benchmark \| Bank of Nova Scotia \| Gold Dore
Disaggregation of Revenue [Line Items]
Concentration risk, percentage			22.00%