| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 4.604 | 0.905 | 2.345 | 6.780 |
| Arsenic | As (ppm) | 5.396 | 1.307 | 1.599 | 10.810 |
| Calcium | Ca (wt%) | 2.574 | 1.188 | 0.201 | 6.187 |
| Copper | Cu (ppm) | 9.160 | 2.905 | 1.258 | 17.841 |
| Iron | Fe (wt%) | 1.676 | 0.285 | 0.799 | 2.636 |
| Mercury | Hg (ppm) | 0.017 | 0.009 | 0.010 | 0.073 |
| Magnesium | Mg (wt%) | 0.484 | 0.124 | 0.163 | 0.877 |
| Manganese | Mn (ppm) | 255.888 | 65.813 | 92.679 | 435.585 |
| Sodium | Na (wt%) | 0.795 | 0.346 | 0.188 | 1.637 |
| Phosphorus | P (wt%) | 0.036 | 0.009 | 0.020 | 0.066 |
| Lead | Pb (ppm) | 13.287 | 3.245 | 4.180 | 23.795 |
| Selenium | Se (ppm) | 0.194 | 0.090 | 0.100 | 0.682 |
| Titanium | Ti (wt%) | 0.261 | 0.040 | 0.142 | 0.394 |
| Zinc | Zn (ppm) | 45.082 | 7.066 | 20.695 | 66.154 |