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ACQUISITIONS AND CHANGE IN INTEREST ON MINERAL PROPERTIES - Consideration Transferred and Net Identifiable Assets Acquired (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 31, 2016
CAD ($)
year
shares
$ / shares
May 30, 2016
CAD ($)
Mar. 07, 2016
CAD ($)
Dec. 31, 2017
CAD ($)
year
shares
Dec. 31, 2016
CAD ($)
year
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
May 31, 2016
USD ($)
$ / $
shares
Disclosure of detailed information about business combination [line items]                
Share options assumed (in shares) | shares       0 809,286      
Goodwill           $ 49,786 $ 49,786  
Expected life (years) | year       4.2 4.2      
Average risk-free interest rate (%)       1.00% 0.63%      
Dividend yield (%)       0.00% 0.00%      
Volatility (%)       60.90% 59.50%      
Minimum                
Disclosure of detailed information about business combination [line items]                
Exercise price, share options granted       $ 12.01 $ 7.17      
Maximum                
Disclosure of detailed information about business combination [line items]                
Exercise price, share options granted       $ 14.12 $ 7.27      
Claude Resources Inc.                
Disclosure of detailed information about business combination [line items]                
Common shares issued               $ 325,202
Common shares issued (in shares) | shares               37,394,000
Stock options assumed               $ 4,045
Share options assumed (in shares) | shares 809,286              
Share exchange cash payment of C$0.001 per Claude Resources share               155
Cash transferred per common share (in CAD per share) | $ / shares $ 0.001              
Consideration               329,402
Cash and cash equivalents               16,908
Trade and other receivables               814
Marketable securities               351
Inventory               34,801
Property, plant and equipment               52,318
Goodwill               49,786
Trade and other payables               (4,657)
Debt               (13,707)
Close-down and restoration provisions               (5,464)
Deferred income tax liabilities               (80,811)
Net identifiable assets acquired               $ 329,402
Transaction share price   $ 11.35 $ 7.89          
Closing foreign exchange rate (in CAD per USD) | $ / $               0.7662
Expected life (years) | year 1.6              
Average risk-free interest rate (%) 0.60%              
Dividend yield (%) 0.00%              
Volatility (%) 60.60%              
Claude Resources Inc. | Minimum                
Disclosure of detailed information about business combination [line items]                
Exercise price, share options granted $ 1.70              
Claude Resources Inc. | Maximum                
Disclosure of detailed information about business combination [line items]                
Exercise price, share options granted $ 12.86              
Claude Resources Inc. | Mineral properties subject to depreciation                
Disclosure of detailed information about business combination [line items]                
Property, plant and equipment               $ 62,229
Claude Resources Inc. | Mineral properties not yet subject to depreciation                
Disclosure of detailed information about business combination [line items]                
Property, plant and equipment               128,100
Claude Resources Inc. | Exploration and evaluation assets                
Disclosure of detailed information about business combination [line items]                
Property, plant and equipment               $ 88,734