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Cost Of Sales
 12 Months Ended
Dec. 31, 2011
Cost of Goods Sold [Abstract]  
Cost Of Sales
COST OF SALES
 
For the years ended December 31
 
2011
 
2010
 
2009
Mining operations costs
$
354,074

 
$
302,902

 
$
247,786

Operations costs from/(to) metal inventory
(9,232
)
 
(4,900
)
 
2,377

Mining related depreciation and amortization
71,466

 
100,649

 
110,460

Accretion of asset retirement obligations
3,845

 
2,803

 
2,165

Total cost of sales
$
420,153

 
$
401,454

 
$
362,788