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ACQUISITIONS - CMC Exploration Assets (Details) - CMC Exploration Assets
$ in Thousands, $ in Millions
Mar. 28, 2018
CAD ($)
Mar. 28, 2018
USD ($)
ACQUISITIONS    
Percentage of acquisition 100.00% 100.00%
Percentage of ownership interest held 100.00%  
Transaction cost capitalized to mining properties   $ 2.9
Total purchase price:    
Cash paid for acquisition $ 162,479  
Total purchase price to allocate 162,479  
Fair value of assets acquired and liabilities assumed:    
Mining properties 161,242  
Plant and equipment 2,423  
Reclamation provision (1,186)  
Net assets acquired $ 162,479  
Yamana    
ACQUISITIONS    
Percentage of acquisition 50.00% 50.00%