Property, Plant And Equipment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment at Cost	$ 510,997	$ 507,442
Accumulated Depreciation	(253,900)	(246,456)
Property, Plant and Equipment Net Book Value	257,097	260,986
Bogoso/Prestea
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment at Cost	192,744	189,247
Accumulated Depreciation	(115,168)	(112,838)
Property, Plant and Equipment Net Book Value	77,576	76,409
Wassa/HBB
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment at Cost	121,360	120,766
Accumulated Depreciation	(68,817)	(65,463)
Property, Plant and Equipment Net Book Value	52,543	55,303
Corporate and Other [Member]
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment at Cost	1,334	1,363
Accumulated Depreciation	(942)	(925)
Property, Plant and Equipment Net Book Value	392	438
Bogoso Refactory Plant | Bogoso/Prestea
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment at Cost	195,559	196,066
Accumulated Depreciation	(68,973)	(67,230)
Property, Plant and Equipment Net Book Value	$ 126,586	$ 128,836