| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.588 | 1.037 | 1.563 | 6.787 |
| Arsenic | As (ppm) | 3.801 | 1.138 | 1.754 | 7.731 |
| Calcium | Ca (wt%) | 1.114 | 0.909 | 0.332 | 6.839 |
| Copper | Cu (ppm) | 5.381 | 1.280 | 3.288 | 11.262 |
| Iron | Fe (wt%) | 1.588 | 0.508 | 0.688 | 3.197 |
| Mercury | Hg (ppm) | 0.016 | 0.006 | 0.010 | 0.039 |
| Magnesium | Mg (wt%) | 0.423 | 0.121 | 0.139 | 0.893 |
| Manganese | Mn (ppm) | 362.540 | 66.413 | 188.827 | 639.152 |
| Sodium | Na (wt%) | 0.453 | 0.095 | 0.179 | 0.677 |
| Phosphorus | P (wt%) | 0.020 | 0.004 | 0.010 | 0.034 |
| Lead | Pb (ppm) | 16.276 | 3.819 | 8.856 | 24.393 |
| Selenium | Se (ppm) | 0.137 | 0.043 | 0.100 | 0.302 |
| Titanium | Ti (wt%) | 0.207 | 0.046 | 0.117 | 0.317 |
| Zinc | Zn (ppm) | 26.079 | 6.968 | 13.629 | 52.821 |