MineralReported chemical assay
RK-25-256: 21.4 % U3O8
NexGen Energy Ltd reported 21.4 % U3O8 over 5.5 metres downhole at Patterson Corridor East, Rook I on Dec 1, 2025.
Source checked Sep 10, 2026. Original issuer disclosure ↗ · NXE.TO company record ↗
| Field | Reported value | Evidence |
|---|---|---|
| Hole identifier | RK-25-256 | Issuer disclosure ↗ |
| Project as reported | Patterson Corridor East, Rook I | Issuer disclosure ↗ |
| Publication date | Dec 1, 2025 | Issuer disclosure ↗ |
| From, downhole (m) | 590 | Issuer disclosure ↗ |
| To, downhole (m) | 595.5 | Issuer disclosure ↗ |
| Reported downhole interval (m) | 5.5 | Issuer disclosure ↗ |
| Reported assay grade | 21.4 % U3O8 | Issuer disclosure ↗ |
| Measurement type | Chemical assay | Issuer disclosure ↗ |
| True-width context | Issuer states true thicknesses have not been determined. | Issuer disclosure ↗ |
| Laboratory named by source | SRC Geoanalytical Results | Issuer disclosure ↗ |
| Source location | Table 1, interval row 4 | Issuer disclosure ↗ |
Transparent arithmetic
The reported 21.4 % converts to 214,000 ppm of the same analyte on a mass basis. The grade-length product is 117.7 %·m.
| Calculation | Working | Basis |
|---|---|---|
| Concentration in ppm | 21.4 × 10,000 = 214,000 ppm U3O8 | Mass-unit conversion |
| Grade × downhole length | 21.4 × 5.5 = 117.7 %·m | Source inputs ↗ |
These calculations are not new assays, true-width estimates, contained metal or an economic comparison. The analyte remains U3O8. No interval has been added to an overlapping parent or sibling.
Aggregation and geometry
Issuer reports a 0.01% U3O8 cutoff, a minimum downhole interval of 0.5 m and maximum internal dilution of 2.0 m. Issuer states true thicknesses have not been determined.
Included intervals
These 2 records overlap this parent. They are shown separately to preserve the issuer’s reporting; they are not additional mineralised length.
Source and coverage
All 16 interval rows in Table 1 for RK-25-256, including three subintervals. Manual transcription checked against linked issuer disclosures. MineralPulse has not independently sampled or assayed the core.
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