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OPERATING SEGMENT REPORTING (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
OPERATING SEGMENT REPORTING |  |  |  |  |
Income on investment in Minera Santa Cruz S.A. | $ (208,000) | $ 0 | $ 990,000 |  |
Exploration costs | 10,073,000 | 10,626,000 | 21,857,000 | 17,535,000 |
Mine construction costs | 6,994,000 |  | 8,635,000 |  |
Mine operating costs | 3,494,000 |  | 6,216,000 |  |
Operating loss | (25,746,000) | (13,408,000) | (48,721,000) | (22,885,000) |
Investment in Minera Santa Cruz S.A. | 225,989,000 |  | 225,989,000 |  |
Mineral property interests | 843,764,000 |  | 843,764,000 |  | 245,454,000
Total assets | 1,137,218,000 |  | 1,137,218,000 |  | 310,355,000
Argentina |  |  |  |  |
OPERATING SEGMENT REPORTING |  |  |  |  |
Income on investment in Minera Santa Cruz S.A. | (208,000) |  | 990,000 |  |
Exploration costs | 5,025,000 |  | 9,830,000 |  |
Operating loss | (6,153,000) |  | (10,427,000) |  |
Investment in Minera Santa Cruz S.A. | 225,989,000 |  | 225,989,000 |  |
Mineral property interests | 597,374,000 |  | 597,374,000 |  |
Total assets | 843,476,000 |  | 843,476,000 |  |
Mexico |  |  |  |  |
OPERATING SEGMENT REPORTING |  |  |  |  |
Exploration costs | 3,792,000 | 7,185,000 | 8,547,000 | 12,024,000 |
Mine construction costs | 6,994,000 |  | 8,635,000 |  |
Mine operating costs | 3,494,000 |  | 6,216,000 |  |
Operating loss | (15,268,000) | (7,639,000) | (26,083,000) | (13,532,000) |
Mineral property interests | 13,735,000 |  | 13,735,000 |  | 12,750,000
Total assets | 39,552,000 |  | 39,552,000 |  | 33,899,000
U.S. |  |  |  |  |
OPERATING SEGMENT REPORTING |  |  |  |  |
Exploration costs | 1,092,000 | 3,144,000 | 2,906,000 | 4,952,000 |
Operating loss | (1,301,000) | (4,175,000) | (3,630,000) | (5,974,000) |
Mineral property interests | 232,655,000 |  | 232,655,000 |  | 232,704,000
Total assets | 237,926,000 |  | 237,926,000 |  | 238,402,000
Corporate & Other |  |  |  |  |
OPERATING SEGMENT REPORTING |  |  |  |  |
Exploration costs | 164,000 | 297,000 | 574,000 | 559,000 |
Operating loss | (3,024,000) | (1,594,000) | (8,581,000) | (3,379,000) |
Total assets | $ 16,264,000 |  | $ 16,264,000 |  | $ 38,054,000

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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