| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.636 | 0.514 | 0.549 | 3.483 |
| Arsenic | As (ppm) | 2.893 | 0.895 | 1.019 | 5.872 |
| Calcium | Ca (wt%) | 0.058 | 0.063 | 0.010 | 0.437 |
| Copper | Cu (ppm) | 4.157 | 1.640 | 1.357 | 12.988 |
| Iron | Fe (wt%) | 0.792 | 0.252 | 0.307 | 1.692 |
| Mercury | Hg (ppm) | 0.018 | 0.008 | 0.010 | 0.050 |
| Magnesium | Mg (wt%) | 0.031 | 0.013 | 0.010 | 0.119 |
| Manganese | Mn (ppm) | 164.897 | 91.931 | 23.203 | 455.548 |
| Sodium | Na (wt%) | 0.006 | 0.002 | 0.003 | 0.014 |
| Phosphorus | P (wt%) | 0.023 | 0.009 | 0.008 | 0.070 |
| Lead | Pb (ppm) | 13.738 | 3.743 | 3.575 | 24.488 |
| Selenium | Se (ppm) | 0.209 | 0.052 | 0.109 | 0.383 |
| Titanium | Ti (wt%) | 0.327 | 0.060 | 0.167 | 0.481 |
| Zinc | Zn (ppm) | 14.170 | 4.411 | 5.100 | 32.827 |