| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.557 | 0.748 | 1.430 | 5.164 |
| Arsenic | As (ppm) | 3.773 | 1.691 | 1.994 | 9.424 |
| Calcium | Ca (wt%) | 0.443 | 0.284 | 0.089 | 1.263 |
| Copper | Cu (ppm) | 4.698 | 1.391 | 2.252 | 8.415 |
| Iron | Fe (wt%) | 1.277 | 0.412 | 0.537 | 2.310 |
| Mercury | Hg (ppm) | 0.035 | 0.014 | 0.013 | 0.075 |
| Magnesium | Mg (wt%) | 0.165 | 0.099 | 0.042 | 0.476 |
| Manganese | Mn (ppm) | 282.187 | 130.553 | 126.695 | 802.195 |
| Sodium | Na (wt%) | 0.311 | 0.151 | 0.102 | 0.781 |
| Phosphorus | P (wt%) | 0.034 | 0.011 | 0.019 | 0.065 |
| Lead | Pb (ppm) | 24.595 | 5.334 | 13.575 | 39.071 |
| Selenium | Se (ppm) | 0.265 | 0.078 | 0.115 | 0.466 |
| Titanium | Ti (wt%) | 0.618 | 0.112 | 0.443 | 0.921 |
| Zinc | Zn (ppm) | 22.297 | 6.231 | 10.216 | 38.680 |