MineralOn a mass basis, 1% = 10,000 ppm and 1 ppm = 1 g/t. These are changes of units, not changes of the substance being measured. USGS concentration-unit reference.
| Percent | Parts per million | Grams per metric tonne |
|---|---|---|
| 1% | 10,000 ppm | 10,000 g/t |
| 0.1% | 1,000 ppm | 1,000 g/t |
| 0.0001% | 1 ppm | 1 g/t |
Keep the analyte unchanged. A uranium concentration and a U₃O₈ concentration are not interchangeable simply because both use percent. Converting an element to an oxide requires the appropriate chemical factor.