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Mining Properties Mining Properties (Policies) | 3 Months Ended
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Mar. 31, 2018
Accounting Policies [Abstract] |
Capitalization of Internal Costs, Policy [Policy Text Block] | The determination of commercial production (or ready for intended use) is based on many factors requiring the exercise of judgment. Factors that are considered when determining if intended use has been achieved include achievement of continuous production or other output, mineral recoveries at or near expected levels, the absence of routine take-downs of the plant to address commissioning issues and fix problems, and the release of the commissioning team. Prior to commercial production, costs related to mine development, construction of long-lived assets, and inventory are capitalized; all other costs are expensed in the period incurred. Amortization of mining properties will commence when the mine has been determined to be in commercial production.

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- Definition Disclosure of accounting policy for capitalizing internal costs associated with exploration and production activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(2)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516343-122869 + Details
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