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Mineral Properties - Guadalupe (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jan. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Mineral properties, Net	$ 2,146		$ 2,146		$ 2,146		$ 2,146
Deferred option gain	248		248		248		$ 68
Gain (Loss) On Disposal Of Mineral Property Interests, Net			2,100	$ 2,568	2,100	$ 2,568
Guadalupe De Los Reyes, Mexico | Option Agreement Two
Property, Plant and Equipment [Line Items]
Payments Receivable In Lieu Of Grant Of Royalty And Back-In Rights				$ 2,100		$ 2,100
Payments Received In Lieu Of Grant Of Royalty And Back-In Rights	$ 1,000	$ 1,100
Gain (Loss) On Disposal Of Mineral Property Interests, Net			$ 2,100		$ 2,100

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- Definition

Mineral properties, net of adjustments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64895-109465

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 360
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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Current amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date.

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