| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.183 | 0.104 | 0.035 | 0.713 |
| Arsenic | As (ppm) | 1.243 | 0.506 | 0.387 | 5.142 |
| Calcium | Ca (wt%) | 0.711 | 0.660 | 0.038 | 3.769 |
| Copper | Cu (ppm) | 2.753 | 1.084 | 1.065 | 7.416 |
| Iron | Fe (wt%) | 0.126 | 0.061 | 0.011 | 0.392 |
| Mercury | Hg (ppm) | 0.011 | 0.002 | 0.010 | 0.027 |
| Magnesium | Mg (wt%) | 0.037 | 0.035 | 0.004 | 0.203 |
| Manganese | Mn (ppm) | 17.093 | 5.805 | 5.306 | 47.602 |
| Sodium | Na (wt%) | 0.022 | 0.025 | 0.003 | 0.144 |
| Phosphorus | P (wt%) | 0.035 | 0.038 | 0.003 | 0.234 |
| Lead | Pb (ppm) | 5.859 | 2.215 | 2.087 | 20.253 |
| Selenium | Se (ppm) | 0.129 | 0.051 | 0.100 | 0.479 |
| Titanium | Ti (wt%) | 0.170 | 0.049 | 0.064 | 0.330 |
| Zinc | Zn (ppm) | 5.936 | 2.675 | 1.089 | 17.158 |