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Mineral Properties (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended
Jul. 31, 2014
Oct. 31, 2013
Jan. 31, 2014
Los Cardones, Mexico [Member]
Oct. 31, 2013
Los Cardones, Mexico [Member]
Aug. 31, 2014
Subsequent Event [Member]
Los Cardones, Mexico [Member]
Business Acquisition [Line Items]          
Percentage of interest sold   100.00%      
Sale price of gold project       $ 13,000  
Proceeds from sale of gold project       7,000  
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates       7,000  
Sale price of gold project       13,000  
Proceeds to be received from sale of joint venture interest     6,000    
Increase to sale price of gold project $ 250       $ 250