| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.808 | 0.567 | 0.581 | 3.829 |
| Arsenic | As (ppm) | 6.659 | 5.285 | 1.480 | 30.482 |
| Calcium | Ca (wt%) | 0.115 | 0.043 | 0.022 | 0.254 |
| Copper | Cu (ppm) | 3.896 | 1.652 | 1.095 | 9.506 |
| Iron | Fe (wt%) | 1.405 | 0.800 | 0.421 | 4.860 |
| Mercury | Hg (ppm) | 0.015 | 0.004 | 0.010 | 0.028 |
| Magnesium | Mg (wt%) | 0.110 | 0.050 | 0.024 | 0.318 |
| Manganese | Mn (ppm) | 248.165 | 163.494 | 56.253 | 1001.420 |
| Sodium | Na (wt%) | 0.188 | 0.070 | 0.026 | 0.377 |
| Phosphorus | P (wt%) | 0.016 | 0.006 | 0.005 | 0.040 |
| Lead | Pb (ppm) | 11.589 | 3.232 | 5.396 | 21.814 |
| Selenium | Se (ppm) | 0.183 | 0.058 | 0.103 | 0.417 |
| Titanium | Ti (wt%) | 0.302 | 0.036 | 0.194 | 0.404 |
| Zinc | Zn (ppm) | 22.044 | 8.084 | 7.226 | 54.364 |