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INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
INCOME TAXES
U.S. federal and state statutory corporate income tax rate (as a percent)			35.00%
Recovery of income taxes related to Argentine peso devaluation	$ 0.9	$ 2.3	$ 2.9	$ 23.7
Deferred Income Tax on Impairment of Mineral Properties	$ 10.4		$ 10.4	$ 22.5

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- Definition

Represents the amount of deferred income tax recovery on impairment of mineral properties.

+ References

No definition available.

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- Definition

Represents the income tax expense (benefit) related to fluctuations in the foreign exchange rate between the Argentine peso and the U.S. dollar.

+ References

No definition available.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 740



-SubTopic 10



-Section 50



-Paragraph 12



-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



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-Name Accounting Standards Codification



-Topic 740



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SAB TOPIC 6.I)



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Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 740



-SubTopic 10



-Section 50



-Paragraph 13



-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

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