| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.691 | 0.177 | 0.296 | 1.248 |
| Arsenic | As (ppm) | 1.927 | 0.541 | 1.076 | 4.431 |
| Calcium | Ca (wt%) | 0.029 | 0.008 | 0.011 | 0.060 |
| Copper | Cu (ppm) | 2.737 | 0.613 | 1.398 | 4.426 |
| Iron | Fe (wt%) | 0.614 | 0.242 | 0.259 | 1.856 |
| Mercury | Hg (ppm) | 0.010 | 0.000 | 0.010 | 0.012 |
| Magnesium | Mg (wt%) | 0.030 | 0.006 | 0.016 | 0.051 |
| Manganese | Mn (ppm) | 180.067 | 46.403 | 84.053 | 359.743 |
| Sodium | Na (wt%) | 0.034 | 0.013 | 0.007 | 0.079 |
| Phosphorus | P (wt%) | 0.009 | 0.003 | 0.003 | 0.017 |
| Lead | Pb (ppm) | 11.558 | 1.752 | 6.425 | 18.615 |
| Selenium | Se (ppm) | 0.113 | 0.016 | 0.100 | 0.177 |
| Titanium | Ti (wt%) | 0.359 | 0.069 | 0.191 | 0.503 |
| Zinc | Zn (ppm) | 14.825 | 4.178 | 6.807 | 30.812 |