| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.614 | 0.324 | 0.099 | 2.378 |
| Arsenic | As (ppm) | 1.792 | 0.512 | 0.789 | 4.317 |
| Calcium | Ca (wt%) | 0.022 | 0.011 | 0.005 | 0.080 |
| Copper | Cu (ppm) | 3.327 | 0.682 | 1.198 | 5.919 |
| Iron | Fe (wt%) | 0.377 | 0.112 | 0.139 | 0.932 |
| Mercury | Hg (ppm) | 0.013 | 0.006 | 0.010 | 0.058 |
| Magnesium | Mg (wt%) | 0.035 | 0.012 | 0.011 | 0.098 |
| Manganese | Mn (ppm) | 90.737 | 27.283 | 29.492 | 213.914 |
| Sodium | Na (wt%) | 0.025 | 0.011 | 0.003 | 0.115 |
| Phosphorus | P (wt%) | 0.006 | 0.002 | 0.003 | 0.020 |
| Lead | Pb (ppm) | 8.821 | 3.616 | 2.109 | 24.540 |
| Selenium | Se (ppm) | 0.167 | 0.109 | 0.101 | 0.971 |
| Titanium | Ti (wt%) | 0.280 | 0.074 | 0.073 | 0.489 |
| Zinc | Zn (ppm) | 8.754 | 2.058 | 4.078 | 17.713 |