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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Of Significant Accounting Policies [Abstract]  
Plant and equipment
The major categories of plant and equipment are depreciated on a straight-line basis using the estimated lives indicated below:
Computer equipment
3 - 7 years
Furniture and fixtures
7 years
Vehicles
2 - 5 years
Mining equipment
5 - 9 years
Mobile equipment components
2 - 9 years
Buildings
LOM
Mine plant equipment
LOM
Underground infrastructure
LOM
Leasehold improvements
Lease term