| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.767 | 0.315 | 2.180 | 3.698 |
| Arsenic | As (ppm) | 3.819 | 0.534 | 1.991 | 5.861 |
| Calcium | Ca (wt%) | 0.161 | 0.039 | 0.118 | 0.381 |
| Copper | Cu (ppm) | 5.230 | 0.922 | 3.755 | 8.309 |
| Iron | Fe (wt%) | 1.572 | 0.212 | 1.084 | 2.196 |
| Mercury | Hg (ppm) | 0.023 | 0.006 | 0.010 | 0.038 |
| Magnesium | Mg (wt%) | 0.164 | 0.018 | 0.134 | 0.220 |
| Manganese | Mn (ppm) | 657.456 | 183.147 | 262.876 | 1322.930 |
| Sodium | Na (wt%) | 0.331 | 0.050 | 0.216 | 0.448 |
| Phosphorus | P (wt%) | 0.022 | 0.005 | 0.014 | 0.034 |
| Lead | Pb (ppm) | 17.470 | 1.209 | 14.167 | 20.484 |
| Selenium | Se (ppm) | 0.269 | 0.062 | 0.107 | 0.485 |
| Titanium | Ti (wt%) | 0.196 | 0.020 | 0.139 | 0.240 |
| Zinc | Zn (ppm) | 31.314 | 4.733 | 22.763 | 50.063 |