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Mineral Properties, Long Valley (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Proceeds from sale	$ 50	$ 1,761
Gain on disposal of mineral property		358
Long Valley [Member] | Sold | Mineral Rights
Property, Plant and Equipment [Line Items]
Proceeds from sale		358
Gain on disposal of mineral property		$ 358
Long Valley [Member] | Sold | Mineral Rights | Minimum
Property, Plant and Equipment [Line Items]
Net smelter return royalty (as a percent)		0.50%
Long Valley [Member] | Sold | Mineral Rights | Maximum
Property, Plant and Equipment [Line Items]
Net smelter return royalty (as a percent)		2.00%
Long Valley [Member] | Sold | Mineral Rights | One Month after the Start of Production [Member]
Property, Plant and Equipment [Line Items]
Future payment		$ 500
Long Valley [Member] | Sold | Mineral Rights | On or Prior to the First Anniversary of the Start of Production [Member]
Property, Plant and Equipment [Line Items]
Future payment		$ 500

X

- Definition

Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Section 50
-Paragraph 1B
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- Definition

This element represents the cash inflow during the period from the sale of a component of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
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-Section 45
-Paragraph 12
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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+ References

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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- Definition

Represents the percentage of net smelter return royalty on any future productions from specified claims.

+ References

No definition available.

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