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FAIR VALUE ACCOUNTING (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Litigation settlement agreement with respect to the Los Azules Copper Project
TNR
Mar. 31, 2013
Recurring
Total
Dec. 31, 2012
Recurring
Total
Mar. 31, 2013
Recurring
Level 1
Dec. 31, 2012
Recurring
Level 1
Mar. 31, 2013
Recurring
Level 2
Dec. 31, 2012
Recurring
Level 2
Assets:              
Cash and cash equivalents   $ 45,122 $ 70,921 $ 45,122 $ 70,921    
Assets   45,122 70,921 45,122 70,921    
Liabilities:              
Accounts payable and accrued liabilities   12,645 21,235     12,645 21,235
Litigation settlement liabilities     3,830   3,830    
Liabilities   $ 12,645 $ 25,065   $ 3,830 $ 12,645 $ 21,235
Shares of common stock required to be issued as part of settlement 1,000,000