| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.606 | 0.319 | 0.165 | 2.176 |
| Arsenic | As (ppm) | 1.860 | 0.537 | 0.840 | 3.760 |
| Calcium | Ca (wt%) | 0.046 | 0.032 | 0.007 | 0.281 |
| Copper | Cu (ppm) | 1.950 | 0.622 | 1.001 | 5.650 |
| Iron | Fe (wt%) | 0.622 | 0.261 | 0.186 | 1.434 |
| Mercury | Hg (ppm) | 0.011 | 0.002 | 0.010 | 0.019 |
| Magnesium | Mg (wt%) | 0.041 | 0.031 | 0.005 | 0.187 |
| Manganese | Mn (ppm) | 139.613 | 56.161 | 46.023 | 370.216 |
| Sodium | Na (wt%) | 0.032 | 0.033 | 0.003 | 0.161 |
| Phosphorus | P (wt%) | 0.008 | 0.003 | 0.003 | 0.018 |
| Lead | Pb (ppm) | 11.900 | 3.796 | 2.544 | 22.164 |
| Selenium | Se (ppm) | 0.113 | 0.015 | 0.100 | 0.195 |
| Titanium | Ti (wt%) | 0.346 | 0.104 | 0.107 | 0.662 |
| Zinc | Zn (ppm) | 13.457 | 4.748 | 4.631 | 41.697 |