Mining Properties (Tables)

9 Months Ended

Sep. 30, 2012

Extractive Industries [Abstract]

Schedule of Mining Properties

	As of September 30, 2012							As of December 31, 2011
	Cost		Accumulated Amortization			Net Book Value		Cost		Accumulated Amortization			Net Book Value
Bogoso/Prestea	$	126,469	$	(63,836	)	$	62,633	$	119,700	$	(60,186	)	$	59,514
Bogoso refractory plant	70,318		(39,121		)	31,197		70,090		(34,839		)	35,251
Mampon	16,095		—			16,095		16,095		—			16,095
Wassa/HBB	336,804		(218,103		)	118,701		314,801		(180,486		)	134,315
Other	29,657		(5,787		)	23,870		27,312		(2,330		)	24,982
Total	$	579,343	$	(326,847	)	$	252,496	$	547,998	$	(277,841	)	$	270,157