| Schedule Of Mineral Rights and Property Acquisition Costs [Table Text Block] |
| Costs | | United States | | | Canada | | | Paraguay | | | Total | |
| Balance, July 31, 2024 | | $ | 172,540 | | | $ | 376,523 | | | $ | 15,014 | | | $ | 564,077 | |
| Sweetwater Acquisition | | | 145,749 | | | | - | | | | - | | | | 145,749 | |
| Additions | | | 165 | | | | 1 | | | | - | | | | 166 | |
| Asset retirement obligations (Note 10) | | | 7,688 | | | | - | | | | - | | | | 7,688 | |
| Impact of foreign currency translation | | | - | | | | (42 | ) | | | - | | | | (42 | ) |
| Balance, April 30, 2025 | | | 326,142 | | | | 376,482 | | | | 15,014 | | | | 717,638 | |
| Accumulated Depletion and Amortization | | United States | | | Canada | | | Paraguay | | | Total | |
| Balance, July 31, 2024 | | | (6,389 | ) | | | (105 | ) | | | - | | | | (6,494 | ) |
| Additions | | | (804 | ) | | | - | | | | - | | | | (804 | ) |
| Balance, April 30, 2025 | | | (7,193 | ) | | | (105 | ) | | | - | | | | (7,298 | ) |
| | | | | | | | | | | | | | | | | |
| Carrying Value | | | | | | | | | | | | | | | | |
| Balance, July 31, 2024 | | $ | 166,151 | | | $ | 376,418 | | | $ | 15,014 | | | $ | 557,583 | |
| Balance, April 30, 2025 | | $ | 318,949 | | | $ | 376,377 | | | $ | 15,014 | | | $ | 710,340 | |
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| Schedule Of Mineral Property Expenditures Incurred by Major Projects [Table Text Block] |
| | | Three Months Ended April 30, | | | Nine Months Ended April 30, | |
| | | 2025 | | | 2024 | | | 2025 | | | 2024 | |
| Permitting and compliance | | $ | 253 | | | $ | 394 | | | $ | 855 | | | $ | 1,733 | |
| Property maintenance | | | 1,246 | | | | 1,073 | | | | 3,738 | | | | 3,020 | |
| Exploration | | | 3,079 | | | | 4,668 | | | | 8,919 | | | | 9,985 | |
| Development | | | 6,493 | | | | 1,769 | | | | 18,759 | | | | 3,414 | |
| Extraction readiness | | | 4,609 | | | | 1,167 | | | | 11,166 | | | | 3,296 | |
| Total | | $ | 15,680 | | | $ | 9,071 | | | $ | 43,437 | | | $ | 21,448 | |
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