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INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
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	$ 2.3	$ 9.9	$ 23.7	$ 23.6
Deferred Income Tax on Impairment of Mineral Properties	22.5	2.2	22.5	7.0
Decrease in deferred tax liabilities	$ 5.8		$ 5.8

X

- Definition

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

+ References

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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

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- Definition

Amount of deferred tax asset, before valuation allowance, attributable to deductible other tax carryforwards.

+ References

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