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Mineral Properties and Exploration and Evaluation Assets (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 02, 2017
USD ($)
shares
Jul. 28, 2016
CAD ($)
shares
Dec. 31, 2016
USD ($)
claim
Dec. 31, 2016
USD ($)
ha
Dec. 31, 2016
USD ($)
a
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]              
Purchase of mining assets           $ 47,060 $ 40,229
Expense arising from exploration for and evaluation of mineral resources           1,534 177
Warrants exercise price issued for nonbusiness combination   6.01          
Lindero Project [member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Common shares of acquirer transferred | shares   14,569,045          
Warrants of acquirer transferred | shares   1,514,677          
Tlacolula Property [member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Purchase of mining assets $ 150            
Fair value of consideration transferred to purchase asset $ 1,328            
Number of instruments or interests issued or issuable | shares 239,385            
Equity interests of acquirer $ 1,128            
NSR royalty, percentage 2.00%            
Half of NSR royalty purchae price, per agreement $ 1,500            
Expense arising from exploration for and evaluation of mineral resources           $ 158  
Northwest Nevada Initiative [member]              
Disclosure of detailed information about property, plant and equipment [line items]              
Number of mineral claims acquired | claim     6,756        
Area of property       96,773 239,128    
Contingent consideration of option agreement cash payment amount     $ 2,300 $ 2,300 $ 2,300   2,300
Contingent consideration of option agreement cash payment and share issuable amount     4,100 4,100 4,100   4,100
Contractual capital commitments     $ 2,000 $ 2,000 $ 2,000   $ 2,000