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SHAREHOLDERS' EQUITY (Details) | 0 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 72 Months Ended |  |
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Feb. 24, 2011 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Jan. 24, 2012 USD ($) | Jan. 19, 2012 | Nov. 30, 2012 Litigation settlement agreement with respect to the Los Azules Copper Project TNR USD ($) | Dec. 31, 2012 Litigation settlement agreement with respect to the Los Azules Copper Project TNR USD ($) item | Dec. 31, 2012 Minimum USD ($) | Dec. 31, 2011 Minimum USD ($) | Dec. 31, 2012 Maximum USD ($) | Dec. 31, 2011 Maximum USD ($) | Nov. 30, 2012 Maximum Litigation settlement agreement with respect to the Los Azules Copper Project TNR | Dec. 31, 2012 Rights offering | Dec. 31, 2012 Rights offering USD ($) | Oct. 29, 2012 Rights offering USD ($) | Oct. 29, 2012 Rights offering CAD | Dec. 31, 2012 Rights offering Mr. McEwen USD ($) | Jan. 24, 2012 Minera Andes | Jan. 31, 2012 Minera Andes | Dec. 31, 2012 Minera Andes | May 30, 2012 2007 Acquisitions | Dec. 31, 2012 2007 Acquisitions | Dec. 31, 2012 Series B Special Voting Preferred Stock | Jan. 19, 2012 Series B Special Voting Preferred Stock
Sale price (in dollars per share) | $ 6.50 |  |  |  | $ 5.22 |  |  |  |  |  |  |  |  |  |  | $ 2.25 | 2.24 |  |  |  |  |  |  |  |
Discount on share price (as a percent) |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |  |  |  |
Number of rights for each share of common stock or Exchangeable Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |  |
Number of rights required to purchase additional shares of same class |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 10 |  |  |  |  |  |  |  |
Sale of exchangeable shares for cash, net of issuance costs (in shares) |  | 7,800,000 |  |  |  |  |  |  |  |  |  |  |  | 7,800,000 |  |  |  | 3,900,000 |  |  |  |  |  |  |
Proceeds from issuance of new shares, net of expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,400,000 |  |  | $ 15,100,000 |  |  |  |  |  |  |
Issuance expenses related to new stock issue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 500,000,000 | 500,000,000 |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Sale of shares for cash, net of issuance costs | 17,250,000 | 19,552,000 |  |  |  |  |  |  |  |  |  |  |  | 19,600,000 |  |  |  | 2,800,000 |  |  |  |  |  |  |
Number of shares issued upon exercise of over-allotment option | 2,250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from shares sold | 112,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from shares sold, net of commissions and expenses | 105,400,000 | 60,419,000 | 105,415,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued upon exercise of stock options |  | 445,000 | 163,000 | 109,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 383,825 |  |
Exercise price of stock options (in dollars per share) |  | $ 1.84 | $ 2.52 | $ 1.86 |  |  |  |  | $ 0.91 | $ 0.91 | $ 3.35 | $ 5.86 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of stock options |  | 3,885,000 | 773,000 | 809,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued as part payment for mining concessions in Mexico |  | 83,000 | 84,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement agreement regarding outstanding litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditure requirement not made by the entity |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period appearing in the agreement which was not the commercial intention of the parties |  |  |  |  |  |  | 36 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock required to be issued as part of settlement |  |  |  |  |  |  | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Back-in Right required to be retained as a percentage of equity of Solitario Properties |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Multiplier to pay expenses attributable to back-in percentage |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dilution percentage of NSR |  |  |  |  |  |  |  | 0.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement liability |  | $ 3,830,000 |  |  |  |  |  | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Exchangeable Shares in connection with the acquisition of Minera Andes |  | 7,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 127,331,498 |  |  |  |  |
Total number of Exchangable Shares issued during period |  | 135,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Exchangeable shares converted into common stock |  | 51,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |  |  |
Outstanding Exchangeable Shares not exchanged |  | 83,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options assumed in acquisitions (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,735,650 |  |  |  | 812,918 |  |
Exercise of options assumed in acquisitions (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,062,000 |  |  |  |
Options expired (in shares) |  | 36,000 |  | 63,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,000 |  | 34,500 |  |
Options exercisable (in shares) |  | 2,503,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 625,650 |  | 394,593 |  |

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