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INVENTORIES (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of inventories [Line Items]    
Operating expense $ 325.4 $ 198.3
Non-current inventories 14.9 78.7
Inventory write-down 15.8 0.0
Cerro San Pedro [Member]    
Disclosure of inventories [Line Items]    
Operating expense 15.8  
Inventory write-down 16.9  
Depreciation expense 1.1  
Inventories recognized [Member]    
Disclosure of inventories [Line Items]    
Operating expense $ 311.6 $ 186.2