| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 4.492 | 0.628 | 3.153 | 6.010 |
| Arsenic | As (ppm) | 6.824 | 1.003 | 4.716 | 9.400 |
| Calcium | Ca (wt%) | 4.786 | 1.259 | 1.109 | 7.914 |
| Copper | Cu (ppm) | 14.551 | 2.486 | 9.776 | 20.193 |
| Iron | Fe (wt%) | 1.893 | 0.321 | 1.263 | 2.600 |
| Mercury | Hg (ppm) | 0.013 | 0.004 | 0.010 | 0.029 |
| Magnesium | Mg (wt%) | 0.581 | 0.090 | 0.401 | 0.785 |
| Manganese | Mn (ppm) | 327.506 | 51.092 | 217.225 | 437.000 |
| Sodium | Na (wt%) | 0.476 | 0.035 | 0.373 | 0.541 |
| Phosphorus | P (wt%) | 0.042 | 0.007 | 0.021 | 0.055 |
| Lead | Pb (ppm) | 16.053 | 2.095 | 11.859 | 23.735 |
| Selenium | Se (ppm) | 0.188 | 0.071 | 0.100 | 0.400 |
| Titanium | Ti (wt%) | 0.243 | 0.024 | 0.180 | 0.300 |
| Zinc | Zn (ppm) | 62.930 | 7.633 | 45.248 | 75.716 |