| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.341 | 1.480 | 0.499 | 6.267 |
| Arsenic | As (ppm) | 4.435 | 2.759 | 0.898 | 10.277 |
| Calcium | Ca (wt%) | 0.165 | 0.123 | 0.013 | 0.451 |
| Copper | Cu (ppm) | 5.448 | 3.183 | 1.122 | 15.727 |
| Iron | Fe (wt%) | 0.801 | 0.540 | 0.223 | 2.610 |
| Mercury | Hg (ppm) | 0.023 | 0.020 | 0.010 | 0.098 |
| Magnesium | Mg (wt%) | 0.161 | 0.153 | 0.018 | 0.677 |
| Manganese | Mn (ppm) | 159.828 | 82.166 | 49.299 | 367.281 |
| Sodium | Na (wt%) | 0.379 | 0.276 | 0.034 | 0.948 |
| Phosphorus | P (wt%) | 0.019 | 0.011 | 0.006 | 0.045 |
| Lead | Pb (ppm) | 10.974 | 4.459 | 5.265 | 26.556 |
| Selenium | Se (ppm) | 0.175 | 0.115 | 0.100 | 0.589 |
| Titanium | Ti (wt%) | 0.241 | 0.036 | 0.147 | 0.361 |
| Zinc | Zn (ppm) | 22.508 | 13.304 | 5.365 | 68.693 |