| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.876 | 0.335 | 0.267 | 2.144 |
| Arsenic | As (ppm) | 2.022 | 0.609 | 0.912 | 5.069 |
| Calcium | Ca (wt%) | 0.033 | 0.032 | 0.006 | 0.274 |
| Copper | Cu (ppm) | 4.037 | 2.606 | 1.139 | 18.322 |
| Iron | Fe (wt%) | 0.685 | 0.231 | 0.302 | 1.513 |
| Mercury | Hg (ppm) | 0.010 | 0.000 | 0.010 | 0.013 |
| Magnesium | Mg (wt%) | 0.051 | 0.021 | 0.016 | 0.161 |
| Manganese | Mn (ppm) | 159.572 | 61.179 | 58.796 | 365.665 |
| Sodium | Na (wt%) | 0.055 | 0.028 | 0.011 | 0.161 |
| Phosphorus | P (wt%) | 0.010 | 0.004 | 0.005 | 0.025 |
| Lead | Pb (ppm) | 16.320 | 4.455 | 8.288 | 29.392 |
| Selenium | Se (ppm) | 0.155 | 0.097 | 0.100 | 0.789 |
| Titanium | Ti (wt%) | 0.445 | 0.105 | 0.151 | 0.793 |
| Zinc | Zn (ppm) | 12.927 | 3.941 | 4.386 | 25.810 |