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Segment Reporting - Segment Reporting Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Exploration expense
Mt Hamilton	$ 301
Exploration	1,685
Corporate and Other
Consolidated	1,986
Interest expense
Mt Hamilton	184
Exploration
Corporate and Other	234
Consolidated	418
Other (1)
Mt Hamilton	58
Exploration	798
Corporate and Other	986
Consolidated	1,842
Pre-tax income (loss)
Mt Hamilton	543
Exploration	2,483
Corporate and Other	1,220
Consolidated	4,246
Total assets (2)(3)
Mt Hamilton	14,236
Exploration	1,467
Corporate and Other	7,780
Consolidated	24,483
Capital Expenditures
Mt Hamilton	3,789
Exploration	3
Corporate and Other	62
Consolidated	$ 3,854