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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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- Definition Percentage of voting equity interests acquired in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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