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Reclamation and Remediation (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis
Reclamation liabilities - balance at beginning of period	$ 1,890	$ 2,003
Foreign currency exchange loss (gain)	(34)	(113)
Reclamation liabilities - balance at end of period	1,856	1,890
Asset retirement obligation - balance at beginning of period	1,208	1,105
Changes in estimate	7	82
Accretion	72	79
Foreign currency exchange loss (gain)	(22)	(58)
Asset retirement obligation - balance at end of period	1,265	1,208
Total period end balance	$ 3,121	$ 3,098

X

- Definition

Amount of the Increase or Decrease in the reclamation liabilities for the period associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability).

+ References

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Reclamation Liabilities

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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-Publisher FASB
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-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of foreign currency translation gain (loss) which decreases (increases) asset retirement obligations.

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Amount of increase (decrease) in asset retirement obligations.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas.

+ References

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-Publisher FASB
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-Topic 450
-SubTopic 20
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