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COMMITMENTS AND CONTINGENCIES - (Narrative) (Details) Ksh in Thousands | Sep. 30, 2025 USD ($) | Sep. 30, 2025 KES (Ksh) | Dec. 31, 2024 USD ($) | Mar. 31, 2014 USD ($)
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Other Commitments [Line Items] |  |  |  |
Licensing condition, obligated stevedoring charge per tonne |  |  |  | $ 1
Loss Contingency, Damages Sought, Value | $ 4,600,000 |  |  |
Loss Contingency, Damages Paid, Value | 1,400,000 |  |  |
Loss Contingency, Damages Held In Escrow, Value | 3,200,000 |  |  |
Loss contingency, estimate of possible loss | 22,660,000 |  | $ 20,000,000.00 |
Asset retirement obligation | $ 26,787,000 |  | 44,117,000 |
Loss Contingency, Damages Sought, Value Per Acre | Ksh |  | Ksh 360 |  |
Loss Contingency, Damages Sought, Annual Interest, Percentage | 20.00% | 20.00% |  |
Mining Properties and Mineral Rights |  |  |  |
Other Commitments [Line Items] |  |  |  |
Renewal costs | $ 540,000 |  |  |
Canyon Project |  |  |  |
Other Commitments [Line Items] |  |  |  |
Asset retirement obligation | $ 55,680,000 |  | $ 74,270,000 |

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