| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.108 | 0.370 | 0.347 | 2.585 |
| Arsenic | As (ppm) | 2.993 | 0.945 | 1.417 | 7.461 |
| Calcium | Ca (wt%) | 0.203 | 0.230 | 0.034 | 1.484 |
| Copper | Cu (ppm) | 3.395 | 1.183 | 1.143 | 8.088 |
| Iron | Fe (wt%) | 0.865 | 0.184 | 0.378 | 1.624 |
| Mercury | Hg (ppm) | 0.011 | 0.002 | 0.010 | 0.021 |
| Magnesium | Mg (wt%) | 0.068 | 0.031 | 0.023 | 0.216 |
| Manganese | Mn (ppm) | 250.254 | 50.478 | 116.694 | 384.036 |
| Sodium | Na (wt%) | 0.130 | 0.060 | 0.026 | 0.373 |
| Phosphorus | P (wt%) | 0.018 | 0.005 | 0.009 | 0.035 |
| Lead | Pb (ppm) | 15.522 | 3.688 | 5.739 | 28.592 |
| Selenium | Se (ppm) | 0.119 | 0.028 | 0.100 | 0.249 |
| Titanium | Ti (wt%) | 0.425 | 0.106 | 0.188 | 0.791 |
| Zinc | Zn (ppm) | 16.785 | 5.273 | 7.597 | 46.217 |