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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 19, 2022 USD ($) mi a purchaseAgreement | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($)
Property, Plant and Equipment [Abstract] |  |  |  |  |
Depreciation expense |  | $ 870 | $ 790 | $ 1,679 | $ 1,559
Purchase Agreement, acres to purchase | a | 37,300 |  |  |  |
Purchase Agreement, miles to purchase | mi | 58.3 |  |  |  |
Number of purchase agreements | purchaseAgreement | 2 |  |  |  |
Purchase Agreement, purchase price | $ 27,500 |  |  |  |
Purchase Agreement, deposit payment | 5,500 | 5,500 |  |  |
Purchase Agreement, payment due at closing | $ 22,000 |  |  |  |
Purchase Agreement, direct deal costs |  | $ 500 |  | $ 500 |

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- Definition Purchase Agreement, Acres To Purchase + References No definition available. + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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