| 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Operating expenses | ||||||||||
| Exploration expenditures | ||||||||||
| General and administrative expenses (Note 11) | ||||||||||
| Total operating expenses | ||||||||||
| Other income (expense) | ||||||||||
| Transaction costs (Note 12) | ||||||||||
| Gain on LAC Warrant and JV Warrant obligations (Note 4) | — | — | ||||||||
| Gain on convertible debt and conversion feature (Note 8) | — | — | ||||||||
| Loss on investments measured at fair value | ||||||||||
| Other income | ||||||||||
| Total other income (expense) | ||||||||||
| Net income (loss) | ||||||||||
| Net income (loss) attributable to: | ||||||||||
| Common stockholders | ||||||||||
| Non-controlling interest | ||||||||||
| Net income (loss) per share attributable to common stockholders, basic (Note 10) | ||||||||||
| Net income (loss) per share attributable to common stockholders, diluted (Note 10) |