INVENTORIES (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 oz	Mar. 31, 2012	Dec. 31, 2012 oz
Inventory, Net [Abstract]
Stockpiled ore	$ 30,218,000		$ 33,130,000
In-process	11,422,000		7,571,000
Materials and supplies	48,610,000		43,548,000
Finished goods	2,600,000		5,963,000
Total	92,850,000		90,212,000
Recoverable ounces of gold			45,000
Unsold ounces of gold	1,916		5,070
Net realizable value adjustments recorded at Bogoso	800,000	100,000
Material and supplies inventory written off		$ 500,000