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Mineral Properties, Long Valley (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2017
Property, Plant and Equipment [Line Items]
Proceeds from sale		$ 358
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 [Member]
Property, Plant and Equipment [Line Items]
Net smelter return royalty (as a percent)	0.50%
Long Valley [Member] | Sold | Mineral Rights | Maximum [Member]
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

Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

+ References

No definition available.

+ Details

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

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

+ References

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+ Details

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- Definition

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

+ References

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+ Details

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- Details

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- Details

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