| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.488 | 0.328 | 0.665 | 2.518 |
| Arsenic | As (ppm) | 4.051 | 1.479 | 1.673 | 10.175 |
| Calcium | Ca (wt%) | 0.067 | 0.055 | 0.016 | 0.335 |
| Copper | Cu (ppm) | 6.232 | 2.447 | 1.879 | 18.335 |
| Iron | Fe (wt%) | 1.183 | 0.539 | 0.451 | 4.199 |
| Mercury | Hg (ppm) | 0.378 | 0.664 | 0.010 | 5.145 |
| Magnesium | Mg (wt%) | 0.087 | 0.023 | 0.037 | 0.182 |
| Manganese | Mn (ppm) | 240.032 | 121.825 | 70.457 | 775.813 |
| Sodium | Na (wt%) | 0.095 | 0.050 | 0.008 | 0.437 |
| Phosphorus | P (wt%) | 0.017 | 0.007 | 0.007 | 0.051 |
| Lead | Pb (ppm) | 10.064 | 4.166 | 3.223 | 27.749 |
| Selenium | Se (ppm) | 0.206 | 0.085 | 0.100 | 0.546 |
| Titanium | Ti (wt%) | 0.195 | 0.081 | 0.042 | 0.664 |
| Zinc | Zn (ppm) | 20.799 | 7.578 | 8.115 | 58.644 |