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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2020
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:
Vehicles
5 - 7 years
Mining equipment
3 years - LOM
Mobile equipment components
2 - 7 years
Buildings LOM
Mine plant equipment LOM
Underground infrastructure LOM
Right-of-use assets - plant and equipment
10 years - LOM
Restatement
The following table outlines the impact of the change in the presentation of interest paid in the consolidated statements of cash flows for the year ended December 31, 2019:
Year ended December 31, 2019
As previously reported Adjustment Restated
Interest paid $ (11,646) $ 11,646  $ — 
Cash generated by operating activities 134,198  11,646  145,844 
Interest paid —  (11,646) (11,646)
Cash generated by financing activities 80,553  (11,646) 68,907