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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Mineral Properties, 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 years - 7 years
Mining equipment | 3 years - 21 years
Mobile equipment components | 2 years - 7 years
Buildings | 5 years - 21 years
Mine plant equipment | 3 years - 21 years
Underground infrastructure | 5 years - 21 years
ROU assets - plant and equipment (1) | 10 years - 21 years
(1)For ROU assets, the depreciation period indicated above represents the period from lease commencement date to the earlier of the end of the useful life of the underlying asset or the end of the lease term. The components of Mineral properties, plant and equipment, net were as follows (in thousands):
|  | December 31,
|  | 2021 |  | 2020
Plant and equipment (1) |  | $ | 1,762,833 |  |  | $ | 1,640,705 |
Construction in process |  |  | 36,841 |  |  |  | 40,290 |
Mineral properties subject to depletion |  |  | 1,331,615 |  |  |  | 1,282,208 |
Mineral properties not yet subject to depletion |  |  | 141,629 |  |  |  | 222,938 |
Exploration and evaluation assets |  |  | 927,176 |  |  |  | 930,606 |
Total mineral properties, plant, and equipment |  |  | 4,200,094 |  |  |  | 4,116,747 |
Accumulated depreciation, plant and equipment |  |  | (529,635) |  |  |  | (423,326) |
Accumulated depreciation, mineral properties |  |  | (420,695) |  |  |  | (223,682) |
Mineral properties, plant, and equipment, net |  | $ | 3,249,764 |  |  | $ | 3,469,739 |
(1)As of December 31, 2021 and 2020, plant and equipment includes finance lease right-of-use assets with a carrying amount of $114.9 million and $112.8 million, respectively.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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