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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (El Gallo Complex)
 12 Months Ended
Dec. 31, 2012
Gold and Silver
  
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Option to sell prior to the completion of refining (as a percent) 90.00%
Period of completion of refining 15 days
Gold and gold equivalents | NSR royalty agreement
  
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Net smelter return (as a percent) 3.50%
Quantity produced (in ounces) 77,000
Gold and gold equivalents | Production up to 30000 ounces | NSR royalty agreement
  
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Net smelter return (as a percent) 1.00%
Gold and gold equivalents | Production up to 30000 ounces | NSR royalty agreement | Maximum
  
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Production quantity used to determine net smelter return 30,000
Gold and gold equivalents | Production between 30001 to 380000 ounces | NSR royalty agreement
  
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Net smelter return (as a percent) 3.50%
Gold and gold equivalents | Production between 30001 to 380000 ounces | NSR royalty agreement | Minimum
  
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Production quantity used to determine net smelter return 30,001
Gold and gold equivalents | Production between 30001 to 380000 ounces | NSR royalty agreement | Maximum
  
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Production quantity used to determine net smelter return 380,000
Gold and gold equivalents | Production above 380000 ounces | NSR royalty agreement
  
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Net smelter return (as a percent) 1.00%
Silver
  
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Quantity produced (in ounces) 4,492