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INVENTORIES (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Inventories
Material on leach pads	$ 8,631	$ 9,188
In-process inventory	6,401	5,486
Stockpiles	2,386	1,168
Precious metals	8,301	12,902
Materials and supplies	3,332	3,207
Current Inventories	29,051	31,951
Other assets
Inventories
Non-current portion of ore on leach pads	$ 9,300	$ 10,400

X

- Definition

Represents the carrying amount, net of reserves and adjustments, as of the balance sheet date, of ore on leach pads.

+ References

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- Definition

Represents non-current portion of ore on leach pads which is included in the other assets.

+ References

No definition available.

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- Definition

Carrying amount, net of reserves and adjustments, as of the balance sheet date, of ore stockpiled.

+ References

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- Definition

Represents the carrying amount, net of reserves and adjustments, as of the balance sheet date, of precious metals.

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ 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 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
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- Definition

Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(6)(a)(4))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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