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Properties, Plant and Equipment	6 Months Ended
	Jun. 30, 2016
Property, Plant and Equipment [Abstract]
Properties, Plant and Equipment	Properties, Plant and Equipment The Company sold land and equipment with a book value of approximately $2.4 million during the six months ended June 30, 2016, and recorded a gain on the sale of that land and equipment totaling $0.6 million. As of June 30, 2016, $0.7 million of the proceeds associated with sale had not yet been collected and is recognized as prepaid expenses and other current assets on the balance sheet. During the three and six months ended June 30, 2016, the Company recognized depreciation expense of $1.5 million and $2.9 million, respectively. Depreciation expense for the three and six-month periods ended June 30, 2015, was $1.6 million and $3.2 million, respectively. Assets Held For Sale During the second quarter of 2016, the Company committed to a plan to sell certain mining equipment and land and buildings. As of June 30, 2016, the Company had assets with a net book value of $4.3 million that met the criteria to be held for sale. Those criteria specify that the asset must be available for immediate sale in its present condition (subject only to terms that are usual and customary for sales of such assets) and the sale of the asset must be probable, and its transfer expected to qualify for recognition as a completed sale, within one year, with certain exceptions.

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- References

No definition available.

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- Definition

The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13-14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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