Inventories (Tables)

6 Months Ended

Jun. 30, 2012

Inventory Disclosure [Abstract]

Schedule of inventories

	As of		As of
	June 30,		December 31,
	2012		2011
Stockpiled ore	$	29,557	$	16,773
In-process	10,716		8,912
Materials and supplies	47,836		48,612
Finished goods	—		—
Total	$	88,109	$	74,297