| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.049 | 0.831 | 0.631 | 4.090 |
| Arsenic | As (ppm) | 8.609 | 4.513 | 2.419 | 35.697 |
| Calcium | Ca (wt%) | 0.176 | 0.113 | 0.020 | 0.795 |
| Copper | Cu (ppm) | 4.267 | 1.193 | 1.030 | 8.563 |
| Iron | Fe (wt%) | 1.809 | 1.111 | 0.463 | 8.571 |
| Mercury | Hg (ppm) | 0.019 | 0.005 | 0.010 | 0.034 |
| Magnesium | Mg (wt%) | 0.134 | 0.098 | 0.026 | 0.760 |
| Manganese | Mn (ppm) | 344.238 | 282.824 | 78.975 | 2124.190 |
| Sodium | Na (wt%) | 0.192 | 0.148 | 0.014 | 0.533 |
| Phosphorus | P (wt%) | 0.021 | 0.010 | 0.008 | 0.079 |
| Lead | Pb (ppm) | 13.909 | 4.093 | 7.022 | 30.752 |
| Selenium | Se (ppm) | 0.208 | 0.071 | 0.101 | 0.496 |
| Titanium | Ti (wt%) | 0.290 | 0.056 | 0.055 | 0.407 |
| Zinc | Zn (ppm) | 31.013 | 16.654 | 9.114 | 135.432 |