Convert mining assay grade values between grams per tonne, ppm, mg/kg, percent, troy ounces per ton, and grams per short or long ton.
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Grams per Ton Formula
The following shows a common mining conversion between grams per tonne (metric) and troy ounces per short ton, followed by key constants below.
\mathrm{ozt/st} = 0.0291667 \times \mathrm{g/t}- 1 g/t = 1 ppm = 1 mg/kg (mass basis)
- 1 tonne (t, metric) = 1,000,000 g
- 1 short ton = 2,000 lb = 907,184.74 g
- 1 long ton = 2,240 lb = 1,016,046.9088 g
- 1 troy ounce (ozt) = 31.1034768 g
Grams per Ton Conversion Table
| g/t | ozt/short ton |
|---|---|
| 0.5 | 0.014583 |
| 0.75 | 0.021875 |
| 1 | 0.029167 |
| 1.25 | 0.036458 |
| 1.5 | 0.043750 |
| 2 | 0.058333 |
| 2.5 | 0.072917 |
| 3 | 0.087500 |
| 4 | 0.116667 |
| 5 | 0.145833 |
| 7.5 | 0.218750 |
| 10 | 0.291667 |
| 12.5 | 0.364583 |
| 15 | 0.437500 |
| 20 | 0.583333 |
| 25 | 0.729167 |
| 30 | 0.875000 |
| 40 | 1.166667 |
| 50 | 1.458333 |
| 100 | 2.916667 |
| * 1 ozt/short ton = 34.2857 g/t; equivalently, 1 g/t = 0.0291667 ozt/st. | |
How do you convert g/t to ozt per short ton? Multiply g/t by 0.0291667 to get ozt/st. For long ton, multiply g/t by (1,016,046.9088 ÷ 1,000,000 ÷ 31.1034768) ≈ 0.0326667; for ozt per metric tonne, divide g/t by 31.1034768.
How do you convert ozt per ton to g/t? For short ton, multiply ozt/st by 34.2857 to get g/t. For long ton, multiply ozt/lt by 30.607; for ozt per metric tonne, multiply ozt/t by 31.1034768.
Example Problem
Convert 7.5 g/t to ozt per short ton.
Use the formula: ozt/st = g/t × 0.0291667.
ozt/st = 7.5 × 0.0291667 ≈ 0.2188 ozt/st
