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Property, Plant And Equipment (Tables)
 3 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
 
As of March 31, 2013
 
December 31, 2012
 
Cost
 
Accumulated
Depreciation
 
Net Book Value
 
Cost
 
Accumulated
Depreciation
 
Net Book Value
Bogoso/Prestea
$
192,744

 
$
(115,168
)
 
$
77,576

 
$
189,247

 
$
(112,838
)
 
$
76,409

Bogoso refractory plant
195,559

 
(68,973
)
 
126,586

 
196,066

 
(67,230
)
 
128,836

Wassa/HBB
121,360

 
(68,817
)
 
52,543

 
120,766

 
(65,463
)
 
55,303

Corporate & other
1,334

 
(942
)
 
392

 
1,363

 
(925
)
 
438

Total
$
510,997

 
$
(253,900
)
 
$
257,097

 
$
507,442

 
$
(246,456
)
 
$
260,986