| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.845 | 0.496 | 1.721 | 4.511 |
| Arsenic | As (ppm) | 4.507 | 1.620 | 1.635 | 9.847 |
| Calcium | Ca (wt%) | 0.598 | 0.650 | 0.166 | 3.176 |
| Copper | Cu (ppm) | 3.642 | 1.332 | 1.760 | 7.729 |
| Iron | Fe (wt%) | 1.128 | 0.309 | 0.578 | 2.099 |
| Mercury | Hg (ppm) | 0.017 | 0.005 | 0.010 | 0.030 |
| Magnesium | Mg (wt%) | 0.161 | 0.050 | 0.081 | 0.347 |
| Manganese | Mn (ppm) | 250.709 | 148.404 | 90.082 | 1180.940 |
| Sodium | Na (wt%) | 0.405 | 0.165 | 0.092 | 1.052 |
| Phosphorus | P (wt%) | 0.017 | 0.003 | 0.010 | 0.025 |
| Lead | Pb (ppm) | 14.521 | 1.258 | 8.602 | 17.966 |
| Selenium | Se (ppm) | 0.217 | 0.090 | 0.103 | 0.657 |
| Titanium | Ti (wt%) | 0.292 | 0.043 | 0.202 | 0.554 |
| Zinc | Zn (ppm) | 29.405 | 4.975 | 17.964 | 44.134 |