The amount of required settlement obligation under the agreements at termination.

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Period within which forecasted CAD (Canadian dollar) denominated operating costs will be hedged.

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Represents the maximum percentage of CAD (Canadian dollar) denominated operating costs to be hedged in the future.

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Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Contractual rate at which a foreign currency can be purchased or sold.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of increase in the fair value of derivatives recognized in the income statement.

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Nominal or face amount used to calculate payment on derivative.

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The number of derivative instruments of a particular group held by the entity.

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The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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The net gain (loss) relating to components of the gain (loss) on foreign currency cash flow hedging instruments excluded from the assessment of hedge effectiveness. Recognized in earnings.

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The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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Note 10 - Derivative Instruments (Details Textual) $ in Thousands, $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 CAD ($)
Maximum Allocation of Forecasted CAD-demonimated Operating Costs		75.00%	75.00%
Forecasted CAD-denominated Operating Costs to be Hedged, Term (Year)		5 years
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net		$ 4,700
Gain (Loss) on Components Excluded from Assessment of Foreign Currency Cash Flow Hedge Effectiveness		0
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months		(3,400)
Other Comprehensive Income (Loss) [Member]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months		2,700
Foreign Exchange Contract [Member]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax		5,200
Foreign Exchange Contract [Member] \| Not Designated as Hedging Instrument [Member]
Unrealized Gain (Loss) on Derivatives		$ (200)
Foreign Exchange Contract [Member] \| Casa Berardi [Member] \| Designated as Hedging Instrument [Member]
Derivative, Number of Instruments Held, Total		166	166
Derivative, Notional Amount		$ 245,300	$ 318.8
Foreign Exchange Contract [Member] \| Casa Berardi [Member] \| Designated as Hedging Instrument [Member] \| Minimum [Member]
Derivative, Forward Exchange Rate		1.2702	1.2702
Foreign Exchange Contract [Member] \| Casa Berardi [Member] \| Designated as Hedging Instrument [Member] \| Maximum [Member]
Derivative, Forward Exchange Rate		1.3753	1.3753
Price Risk Derivative [Member]
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax		$ (14,600)
Unsettled Concentrate Sales Contracts [Member]
Derivative, Gain (Loss) on Derivative, Net, Total		(500)
Forecasted Future Concentrate Contracts [Member]
Derivative, Gain (Loss) on Derivative, Net, Total		(32,900)
Derivative, Gain on Derivative	$ 6,700
Commodity Contract [Member]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral, Total		39,100
Derivative, Fair Value, Obligations Under the Agreements		$ 39,100