MineralGram-metres = grade (g/t) × interval length (m). The resulting unit is g·m/t. It expresses a grade-length product for the reported interval.
| Grade | Interval | Product |
|---|---|---|
| 2 g/t | 10 m | 20 g·m/t |
| 5 g/t | 4 m | 20 g·m/t |
These examples have the same product but different grades and lengths. The product alone does not make the intersections geologically or economically equivalent.
What the product leaves out
It does not measure contained ounces, tonnage, recovery or value. Downhole length can differ from true width. The original disclosure must explain the geometry and aggregation assumptions; see the JORC 2012 reporting checklist, Table 1.