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PROPERTY, PLANT, EQUIPMENT AND MINING DEVELOPMENT COSTS, NET (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment, Net [Abstract] |
Property, Plant, Equipment and Mining Development Costs, Net | The components of net property, plant, equipment and mine development costs follow:
| December 31,
| 2020 |  | 2019
Proven and probable mineral reserves | $ | 7,142 |  |  | $ | 7,087 |
VBPP | 376 |  |  | 465 |
Mine development and other | 10,686 |  |  | 8,180 |
Buildings and infrastructure | 9,214 |  |  | 8,435 |
Machinery and equipment | 14,235 |  |  | 13,312 |
Mobile equipment | 4,495 |  |  | 4,320 |
Construction in progress | 1,454 |  |  | 4,265 |
Oil and gas properties | 27,281 |  |  | 27,293 |
Total | 74,883 |  |  | 73,357 |
Accumulated depreciation, depletion, and amortization a | (45,065) |  |  | (43,773) |
Property, plant, equipment and mine development costs, net | $ | 29,818 |  |  | $ | 29,584 |

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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=6877327&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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