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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
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