Summary of material accounting policies (Narrative) (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Mining interests [Member] | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Estimated useful live of plant and equipment | unit of production based upon estimated proven and probable reserves. |
| Plant and equipment [Member] | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Estimated useful live of plant and equipment | 3-30 years over straight-line basis or units of production based upon estimated proven and probable reserves as applicable. |
| Corporate office equipment [Member] | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Estimated useful live of plant and equipment | 3-10 years over straight-line basis. |