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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4)
 12 Months Ended
Dec. 31, 2013
Gold and Silver | El Gallo Complex
  
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 | El Gallo 1 mine and El Gall 2 project | NSR royalty agreement
  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Net smelter return (as a percent) 3.50%
Quantity produced (in ounces) 110,000
Gold and gold equivalents | El Gallo 1 mine and El Gall 2 project | Production up to 30000 ounces | NSR royalty agreement
  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Net smelter return (as a percent) 1.00%
Gold and gold equivalents | El Gallo 1 mine and El Gall 2 project | Production up to 30000 ounces | NSR royalty agreement | Maximum
  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Production quantity used to determine net smelter return 30,000
Gold and gold equivalents | El Gallo 1 mine and El Gall 2 project | Production between 30001 to 380000 ounces | NSR royalty agreement
  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Net smelter return (as a percent) 3.50%
Gold and gold equivalents | El Gallo 1 mine and El Gall 2 project | Production between 30001 to 380000 ounces | NSR royalty agreement | Minimum
  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Production quantity used to determine net smelter return 30,001
Gold and gold equivalents | El Gallo 1 mine and El Gall 2 project | Production between 30001 to 380000 ounces | NSR royalty agreement | Maximum
  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Production quantity used to determine net smelter return 380,000
Gold and gold equivalents | El Gallo 1 mine and El Gall 2 project | Production above 380000 ounces | NSR royalty agreement
  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Net smelter return (as a percent) 1.00%