| Line Item | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 | Sep 30, 2023 | Jun 30, 2023 | Mar 31, 2023 | Dec 31, 2022 | Sep 30, 2022 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EXPENSES: | ||||||||||||||||
| Claim rental | ||||||||||||||||
| Exploration | ||||||||||||||||
| Depreciation | ||||||||||||||||
| Accretion | ||||||||||||||||
| General and administrative | ||||||||||||||||
| Total expenses | ||||||||||||||||
| Income from equity investment in Peak Gold, LLC | ||||||||||||||||
| Total (loss)/income from operations | ||||||||||||||||
| OTHER INCOME/(EXPENSE): | ||||||||||||||||
| Interest and other income | ||||||||||||||||
| Interest and finance expense | ||||||||||||||||
| Loss on derivative contracts | ||||||||||||||||
| Gain on metal sales | ||||||||||||||||
| Gain/(loss) on marketable securities | — | — | ||||||||||||||
| Total other income/(expense) | ||||||||||||||||
| Income/(loss) before income taxes | ||||||||||||||||
| Income tax benefit/(expense) | ||||||||||||||||
| NET INCOME/(LOSS) | ||||||||||||||||
| Net Income/(loss) per share, basic | ||||||||||||||||
| Net Income/(loss) per share, diluted |