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BENEFIT PLANS: (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
SCC Defined Benefit Pension Plans
    
Defined benefit plan, net periodic benefit cost    
Interest cost $ 0.4 $ 0.4
Expected return on plan assets (0.5) (0.5)
Amortization of net loss (gain) 0.1 0.1
SCC Post-retirement Health Care Plan
    
Defined benefit plan, net periodic benefit cost    
Maximum total periodic benefit cost 0.1 0.1
Minera Mexico Pension Plans
    
Defined benefit plan, net periodic benefit cost    
Interest cost 0.5 0.5
Service cost 0.7 0.8
Expected return on plan assets (2.2) (2.5)
Amortization of net loss (gain) (0.6) (1.1)
Amortization of transition assets, net   (0.1)
Net periodic benefit costs (1.6) (2.4)
Minera Mexico Post-retirement Health Care Plan
    
Defined benefit plan, net periodic benefit cost    
Interest cost 1.1 2.8
Amortization of net loss (gain) (0.2)  
Amortization of transition assets, net   1.1
Net periodic benefit costs $ 0.9 $ 3.9