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Mineral Property - Capitalized Development Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property, Plant and Equipment [Abstract]        
Development expenditures $ 201 $ 543 $ 692 $ 1,383
Capitalized interest $ 154 $ 161 493 463
Property payments 190 100
Capitalized depreciation $ 2 $ 4 7 20
Total capitalized costs $ 357 $ 708 $ 1,382 $ 1,966