| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.633 | 0.665 | 1.142 | 4.315 |
| Arsenic | As (ppm) | 4.157 | 1.537 | 0.737 | 9.401 |
| Calcium | Ca (wt%) | 0.225 | 0.071 | 0.074 | 0.393 |
| Copper | Cu (ppm) | 8.183 | 2.563 | 3.007 | 15.591 |
| Iron | Fe (wt%) | 1.372 | 0.364 | 0.661 | 2.410 |
| Mercury | Hg (ppm) | 0.021 | 0.008 | 0.010 | 0.039 |
| Magnesium | Mg (wt%) | 0.212 | 0.068 | 0.080 | 0.396 |
| Manganese | Mn (ppm) | 403.552 | 133.940 | 82.565 | 834.649 |
| Sodium | Na (wt%) | 0.279 | 0.065 | 0.122 | 0.377 |
| Phosphorus | P (wt%) | 0.021 | 0.008 | 0.010 | 0.048 |
| Lead | Pb (ppm) | 16.136 | 5.466 | 8.014 | 33.108 |
| Selenium | Se (ppm) | 0.425 | 0.310 | 0.100 | 1.353 |
| Titanium | Ti (wt%) | 0.218 | 0.033 | 0.157 | 0.324 |
| Zinc | Zn (ppm) | 38.952 | 20.325 | 13.043 | 101.792 |