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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Concentrations  
Bank account balances in excess of the federally insured limits $ 59,700,000
Federally insured limits $ 100,000
Stockpiles, Ore on Leach Pads, In-process Inventory, Precious Metals Inventory and Materials and Supplies:  
Period for determining current portion of stockpiles, ore on leach pad, in-process inventory and materials and supplies 12 months
Period within which Stockpiles, ore on leach pads, in-process inventory and materials and supplies are not expected to be processed, classified as long-term 12 months
San Jose Mine
  
Proven and Probable Reserves  
Ownership interest (as a percent) 49.00%