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Mineral Properties - Capitalized Investment in Mineral Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Lik project (Alaska US)
Capitalized Investment Mineral Properties	$ 15,611	$ 15,611
La Promesa (Peru)
Capitalized Investment Mineral Properties	6	6
Montana Royalty property (US)
Capitalized Investment Mineral Properties	$ 40	$ 40

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- Definition

The sum of the capitalized costs incurred during the period of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(7)(ii))
-URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Details

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X

- Details

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Period Type:

X

- Details

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