| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.484 | 0.592 | 1.079 | 4.800 |
| Arsenic | As (ppm) | 3.290 | 0.898 | 0.876 | 7.182 |
| Calcium | Ca (wt%) | 1.056 | 0.863 | 0.145 | 4.695 |
| Copper | Cu (ppm) | 6.943 | 1.430 | 3.056 | 12.054 |
| Iron | Fe (wt%) | 0.970 | 0.284 | 0.326 | 2.055 |
| Mercury | Hg (ppm) | 0.010 | 0.001 | 0.010 | 0.015 |
| Magnesium | Mg (wt%) | 0.242 | 0.107 | 0.053 | 0.797 |
| Manganese | Mn (ppm) | 131.943 | 36.811 | 59.003 | 235.814 |
| Sodium | Na (wt%) | 0.260 | 0.049 | 0.131 | 0.403 |
| Phosphorus | P (wt%) | 0.016 | 0.005 | 0.007 | 0.037 |
| Lead | Pb (ppm) | 10.606 | 2.431 | 6.005 | 24.895 |
| Selenium | Se (ppm) | 0.123 | 0.033 | 0.100 | 0.299 |
| Titanium | Ti (wt%) | 0.157 | 0.029 | 0.080 | 0.224 |
| Zinc | Zn (ppm) | 30.384 | 6.883 | 10.551 | 54.728 |