| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.641 | 0.549 | 2.380 | 5.509 |
| Arsenic | As (ppm) | 3.688 | 1.058 | 1.637 | 6.993 |
| Calcium | Ca (wt%) | 0.770 | 0.459 | 0.248 | 2.312 |
| Copper | Cu (ppm) | 8.447 | 1.692 | 5.035 | 13.449 |
| Iron | Fe (wt%) | 1.275 | 0.369 | 0.556 | 2.555 |
| Mercury | Hg (ppm) | 0.010 | 0.000 | 0.010 | 0.010 |
| Magnesium | Mg (wt%) | 0.443 | 0.247 | 0.148 | 1.430 |
| Manganese | Mn (ppm) | 279.314 | 106.592 | 105.699 | 610.322 |
| Sodium | Na (wt%) | 0.727 | 0.089 | 0.418 | 0.942 |
| Phosphorus | P (wt%) | 0.027 | 0.006 | 0.015 | 0.045 |
| Lead | Pb (ppm) | 16.846 | 2.297 | 10.292 | 25.719 |
| Selenium | Se (ppm) | 0.133 | 0.031 | 0.100 | 0.242 |
| Titanium | Ti (wt%) | 0.212 | 0.036 | 0.116 | 0.300 |
| Zinc | Zn (ppm) | 26.100 | 8.511 | 9.994 | 54.719 |