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PROPERTY, PLANT AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2018
Property Plant And Equipment  
Property, plant and equipment
    At December 31   At December 31   At January 1
(in thousands)   2018   2017   2017
             
Plant and equipment:            
Cost $ 97,243 $ 96,762 $ 97,477
Construction-in-progress   6,187   6,424   6,473
Accumulated depreciation   (24,086)   (20,516)   (16,930)
Net book value $ 79,344 $ 82,670 $ 87,020
             
Mineral properties:            
Cost $ 178,947 $ 166,332 $ 165,372
Net book value $ 178,947 $ 166,332 $ 165,372
Total Net book value $ 258,291 $ 249,002 $ 252,392
Plant and equipment continuity
        Accumulated    
        Amortization /   Net
(in thousands)   Cost   Depreciation   Book Value
             
Plant and equipment:            
Balance-January 1, 2017 $ 103,950 $ (16,930) $ 87,020
Additions   257   -   257
Amortization   -   (190)   (190)
Depreciation (note 23)   -   (4,371)   (4,371)
Disposals   (806)   785   (21)
Reclamation adjustment (note 16)   (215)   190   (25)
Balance-December 31, 2017 $ 103,186 $ (20,516) $ 82,670
             
Additions   173   -   173
Amortization   -   (189)   (189)
Depreciation (note 23)   -   (3,661)   (3,661)
Disposals   (365)   91   (274)
Reclamation adjustment (note 16)   436   189   625
Balance-December 31, 2018 $ 103,430 $ (24,086) $ 79,344
Mineral property continuity
        Accumulated   Net
(in thousands)   Cost   Amortization   Book Value  
             
Mineral properties:            
Balance-January 1, 2017 $ 165,372 $ - $ 165,372
Additions   829   -   829
Impairment reversal   331   -   331
Recoveries   (200)   -   (200)
Balance-December 31, 2017 $ 166,332 $ - $ 166,332
             
Additions   18,923   -   18,923
Impairment expense   (6,086)   -   (6,086)
Recoveries   (222)   -   (222)
Balance-December 31, 2018 $ 178,947 $ - $ 178,947