| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.859 | 0.305 | 0.243 | 2.470 |
| Arsenic | As (ppm) | 2.567 | 0.979 | 1.455 | 8.662 |
| Calcium | Ca (wt%) | 0.085 | 0.128 | 0.012 | 1.094 |
| Copper | Cu (ppm) | 3.706 | 0.835 | 1.453 | 6.235 |
| Iron | Fe (wt%) | 0.516 | 0.226 | 0.199 | 1.770 |
| Mercury | Hg (ppm) | 0.014 | 0.004 | 0.010 | 0.035 |
| Magnesium | Mg (wt%) | 0.037 | 0.013 | 0.012 | 0.112 |
| Manganese | Mn (ppm) | 149.622 | 61.900 | 61.705 | 467.877 |
| Sodium | Na (wt%) | 0.016 | 0.008 | 0.004 | 0.051 |
| Phosphorus | P (wt%) | 0.011 | 0.004 | 0.004 | 0.028 |
| Lead | Pb (ppm) | 12.310 | 2.148 | 3.432 | 20.408 |
| Selenium | Se (ppm) | 0.167 | 0.049 | 0.102 | 0.372 |
| Titanium | Ti (wt%) | 0.374 | 0.098 | 0.212 | 0.866 |
| Zinc | Zn (ppm) | 11.690 | 3.705 | 5.415 | 30.111 |