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STOCK-BASED COMPENSATION (Details 2)
 9 Months Ended
Sep. 30, 2012
$0.00-$2.00
McEwen Mining
USD ($)
Sep. 30, 2012
$2.01-$4.00
McEwen Mining
USD ($)
Sep. 30, 2012
$4.01-$6.00
McEwen Mining
USD ($)
Sep. 30, 2012
$6.01-$8.31
McEwen Mining
USD ($)
Sep. 30, 2012
C$0.00-C$5.00
Nevada Pacific Gold Ltd.
CAD
Sep. 30, 2012
C$5.01-C$6.70
Nevada Pacific Gold Ltd.
CAD
Sep. 30, 2012
C$0.00-C$2.22
Minera Andes
CAD
Sep. 30, 2012
C$2.23-C$3.02
Minera Andes
CAD
Stock options outstanding and exercisable                
Range of Exercise Price, low end of range (in dollars per share) $ 0.00 $ 2.01 $ 4.01 $ 6.01 0.00 5.01 0.00 2.23
Range of Exercise Price, high end of range (in dollars per share) $ 2.00 $ 4.00 $ 6.00 $ 8.31 5.00 6.70 2.22 3.02
Options Outstanding                
Number Outstanding 1,339,000 1,030,800 366,500 886,333 271,543 123,050 220,500 525,150
Weighted Average Exercise Price (in dollars per share) $ 1.05 $ 2.57 $ 5.66 $ 7.17 4.54 5.96 1.67 2.40
Weighted Average Remaining Contractual Life 6 years 2 months 8 days 6 years 18 days 8 years 5 months 26 days 8 years 2 months 8 days 3 years 6 months 4 days 2 years 3 months 4 days 1 year 3 months 29 days 2 years 3 months 22 days
Options Exercisable                
Number Exercisable 1,339,000 827,467 66,500 331,664 271,543 123,050 220,500 377,101
Weighted Average Exercise Price (in dollars per share) $ 1.05 $ 2.59 $ 5.01 $ 7.28 4.54 5.96 1.67 2.45
Weighted Average Remaining Contractual Life 6 years 2 months 8 days 5 years 8 months 23 days 4 years 8 months 12 days 7 years 8 months 26 days 3 years 6 months 4 days 2 years 3 months 4 days 1 year 3 months 29 days 2 years 2 months 8 days