Annual report pursuant to Section 13 and 15(d)

Mineral Properties (Details)

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Mineral Properties (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Lost Creek Property [Member]
Dec. 31, 2012
Lost Creek Property [Member]
Jun. 30, 2013
Other Us Properties [Member]
Dec. 31, 2013
Other Us Properties [Member]
Dec. 31, 2012
Other Us Properties [Member]
Dec. 31, 2013
Canadian Properties [Member]
Dec. 31, 2012
Canadian Properties [Member]
Dec. 31, 2013
Path Finder Mines [Member]
Dec. 31, 2012
Path Finder Mines [Member]
Balance $ 33,501 [1] $ 31,480 [1]   $ 15,505 [1] $ 13,917 [1]   $ 17,471 [1] $ 17,050 [1] $ 525 [1] $ 513 [1] $ 0 [1] $ 0 [1]
Property acquired in asset exchange   971 [1]     971 [1]     0 [1]   0 [1]   0 [1]
Capitalized Reclamation Costs 10,276 320 [1]   10,276 292 [1]   0 28 [1] 0 0 [1] 0 0 [1]
Royalty acquired for common stock 783     783     0   0   0  
Property write-offs (1,430) 0 0 0   (261) (1,430)   0   0  
Functional Currency exchange rate adjustment (5,274) [2]     (2,443) [2]     (2,831) [2]       0 [2]  
Reporting exchange rate adjustment (36) [2] 730 [1]   0 [2] 325 [1]   0 [2] 393 [1] (36) [2] 12 [1] 0 [2] 0 [1]
Amortization (435)     (435)     0   0   0  
Purchase of Pathfinder Mines 15,317     0     0   0   15,317  
Balance $ 52,702 $ 33,501 [1] $ 31,480 [1] $ 23,686 $ 15,505 [1]   $ 13,210 $ 17,471 [1] $ 489 $ 525 [1] $ 15,317 $ 0 [1]
[1] As a result of the change in reporting balances, the above was restated to reflect the change from Canadian reporting currency to U.S. dollar reporting currency.
[2] As a result of the change in functional currency, a CTA as of the date of conversion reduced the reported cost of the U.S. mineral properties by $5.3 million. The above adjustments reflect both the functional currency adjustment in U.S. properties and adjustments due to changes in the year end spot rate in Canadian properties (see note 4).