Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties (Details)

v3.3.0.814
Mineral Properties (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mineral Properties, Rollforward      
Balance, beginning of period   $ 52,750 $ 5,700
Acquisition costs   1  
Increase in reclamation costs   1,460  
Property write-offs $ (329)   $ (422)
Amortization   (3,651)  
Balance, end of period   50,560  
Lost Creek Property [Member]      
Mineral Properties, Rollforward      
Balance, beginning of period   18,512  
Increase in reclamation costs   1,460  
Amortization   (3,651)  
Balance, end of period   16,321  
Path Finder Mines [Member]      
Mineral Properties, Rollforward      
Balance, beginning of period   21,028  
Acquisition costs   1  
Balance, end of period   21,029  
Other US Properties [Member]      
Mineral Properties, Rollforward      
Balance, beginning of period   13,210  
Balance, end of period   $ 13,210