Quarterly report pursuant to Section 13 or 15(d)

Mineral Properties (Details)

v2.4.0.8
Mineral Properties (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mineral Properties [Line Items]        
Balance, December 31, 2013     $ 52,702  
Acquisition costs     41  
Reporting exchange rate adjustment     (1)  
Write off of mineral property (note 9) (93) (262) (93) (262)
Amortization     (2,589)  
Balance, June 30, 2014 50,060   50,060  
Lost Creek Property [Member]
       
Mineral Properties [Line Items]        
Balance, December 31, 2013     23,685  
Acquisition costs     0  
Reporting exchange rate adjustment     0  
Write off of mineral property (note 9)     0  
Amortization     (2,589)  
Balance, June 30, 2014 21,096   21,096  
Path Finder Mines [Member]
       
Mineral Properties [Line Items]        
Balance, December 31, 2013     15,318  
Acquisition costs     41  
Reporting exchange rate adjustment     0  
Write off of mineral property (note 9)     0  
Amortization     0  
Balance, June 30, 2014 15,359   15,359  
Other US Properties [Member]
       
Mineral Properties [Line Items]        
Balance, December 31, 2013     13,210  
Acquisition costs     0  
Reporting exchange rate adjustment     0  
Write off of mineral property (note 9)     0  
Amortization     0  
Balance, June 30, 2014 13,210   13,210  
Canadian Properties [Member]
       
Mineral Properties [Line Items]        
Balance, December 31, 2013     489  
Acquisition costs     0  
Reporting exchange rate adjustment     (1)  
Write off of mineral property (note 9)     (93)  
Amortization     0  
Balance, June 30, 2014 $ 395   $ 395