| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.671 | 0.366 | 0.135 | 2.819 |
| Arsenic | As (ppm) | 1.668 | 0.527 | 0.632 | 3.805 |
| Calcium | Ca (wt%) | 1.994 | 1.895 | 0.156 | 18.036 |
| Copper | Cu (ppm) | 9.229 | 7.768 | 1.029 | 34.836 |
| Iron | Fe (wt%) | 0.321 | 0.124 | 0.076 | 0.946 |
| Mercury | Hg (ppm) | 0.015 | 0.005 | 0.010 | 0.038 |
| Magnesium | Mg (wt%) | 0.050 | 0.026 | 0.007 | 0.162 |
| Manganese | Mn (ppm) | 59.928 | 22.468 | 17.559 | 144.180 |
| Sodium | Na (wt%) | 0.046 | 0.025 | 0.005 | 0.195 |
| Phosphorus | P (wt%) | 0.024 | 0.007 | 0.007 | 0.048 |
| Lead | Pb (ppm) | 12.918 | 4.375 | 3.248 | 41.061 |
| Selenium | Se (ppm) | 0.181 | 0.068 | 0.100 | 0.482 |
| Titanium | Ti (wt%) | 0.283 | 0.054 | 0.077 | 0.475 |
| Zinc | Zn (ppm) | 11.676 | 6.209 | 1.772 | 32.327 |