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FAIR VALUE ACCOUNTING (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Nov. 30, 2012
Litigation settlement agreement with respect to the Los Azules Copper Project
TNR
Dec. 31, 2012
Litigation settlement agreement with respect to the Los Azules Copper Project
TNR
Dec. 31, 2012
Recurring
Total
Dec. 31, 2011
Recurring
Total
Dec. 31, 2012
Recurring
Level 1
Dec. 31, 2011
Recurring
Level 1
Dec. 31, 2012
Recurring
Level 2
Dec. 31, 2011
Recurring
Level 2
Assets:                      
Cash and cash equivalents           $ 70,921 $ 13,416 $ 70,921 $ 13,416    
Short-term investments   3,933         3,933   3,933    
Marketable equity securities 3 1,480 4,576     3 1,480 3 897   583
Assets           70,924 18,829 70,924 18,246   583
Liabilities:                      
Accounts payable and accrued liabilities           21,235 5,612     21,235 5,612
Litigation settlement liability 3,830       3,800 3,830   3,830      
Liabilities           $ 25,065   $ 3,830   $ 21,235  
Shares of common stock required to be issued as part of settlement       1,000,000 1,000,000