Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties rollforward (Details)

v3.2.0.727
Mineral Properties rollforward (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
USD ($)
Balance at beginning of period $ 52,750
Amortization (2,589)
Balance at end of period 50,161
Lost Creek Property  
Balance at beginning of period 18,512
Amortization (2,589)
Balance at end of period 15,923
Other Us Properties [Member]  
Balance at beginning of period 13,210
Balance at end of period 13,210
Path Finder Mines [Member]  
Balance at beginning of period 21,028
Balance at end of period $ 21,028