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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE (Details) (MSC, USD $) In Thousands, unless otherwise specified	3 Months Ended			11 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	Jan. 24, 2012
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Interest acquired (as a percent)					49.00%
Interest held (as a percent)				49.00%	49.00%
Equity Method Investments, Fair Value Disclosure				$ 262,883
Amortization of fair value increments	1,668	916	953	4,466
Net loss	(2,654)	(20,364)	(17,351)	51,634
Minera Andes
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Interest acquired (as a percent)					49.00%
Reported
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Amortization of fair value increments	1,597	1,803	2,804
Net loss	(2,583)	(21,251)	(19,202)
Adjustment
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Amortization of fair value increments	71	(887)	(1,851)
Net loss	(71)	887	1,851
Purchase price allocation adjustment
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Equity Method Investments, Fair Value Disclosure	$ 261,200	$ 225,000		$ 262,900

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