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Mineral Properties, Los Cardones (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2015	Oct. 31, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Gain on disposal of mineral property, net			$ 358	$ 150	$ 1,958
Los Cardones Sale [Member] | Sold
Property, Plant and Equipment [Line Items]
Percentage of interest sold	100.00%	100.00%
Sale price of gold project		$ 13,000
Proceeds from sale of gold project		7,000
Proceeds from sale of gold project, net of legal costs	$ 2,994
Additional consideration received						$ 500
Future proceeds		$ 6,000
Gain on disposal of mineral property, net	$ 1,958

X

- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or sale of an entity that is related to it but not strictly controlled.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: 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=66902209&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

Additional consideration received from the sale of property.

+ References

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+ Details

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- Definition

Represents proceeds that will be received in the future from the sale of an assets.

+ References

No definition available.

+ Details

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- Definition

The gains (losses) included in results of operations resulting from the sale or disposal of mineral property, net of transaction costs, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

+ References

No definition available.

+ Details

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- Definition

Percentage of interest sold.

+ References

No definition available.

+ Details

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- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or sale of an entity that is related to it but not strictly controlled, net of legal costs.

+ References

No definition available.

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- Definition

Sale price of gold/silver project.

+ References

No definition available.

+ Details

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