Inventory (Tables)

3 Months Ended

Mar. 31, 2012

Inventory

Schedule of inventory

	March 31, 2012		December 31, 2011
Current:
Concentrate stockpiles	$	1,832	$	3,704
Raw materials		33,540		44,770
Work in process		14,099		16,602
Finished goods		58,991		45,045
Materials and supplies		2,025		1,822
Total current	$	110,487	$	111,943
Long-term:
Concentrate stockpiles	$	1,867	$	1,144
Raw materials		8,328		3,186
Finished goods		5		32
Total long-term	$	10,200	$	4,362