| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.322 | 0.444 | 0.693 | 3.029 |
| Arsenic | As (ppm) | 4.382 | 1.976 | 1.239 | 10.554 |
| Calcium | Ca (wt%) | 0.075 | 0.039 | 0.012 | 0.221 |
| Copper | Cu (ppm) | 3.781 | 0.778 | 1.128 | 5.613 |
| Iron | Fe (wt%) | 1.205 | 0.515 | 0.434 | 2.866 |
| Mercury | Hg (ppm) | 0.012 | 0.003 | 0.010 | 0.031 |
| Magnesium | Mg (wt%) | 0.064 | 0.031 | 0.021 | 0.169 |
| Manganese | Mn (ppm) | 149.633 | 48.595 | 75.189 | 289.918 |
| Sodium | Na (wt%) | 0.073 | 0.038 | 0.026 | 0.293 |
| Phosphorus | P (wt%) | 0.013 | 0.005 | 0.005 | 0.030 |
| Lead | Pb (ppm) | 11.801 | 3.047 | 6.197 | 25.336 |
| Selenium | Se (ppm) | 0.150 | 0.051 | 0.100 | 0.346 |
| Titanium | Ti (wt%) | 0.352 | 0.073 | 0.195 | 0.690 |
| Zinc | Zn (ppm) | 21.532 | 7.405 | 9.260 | 44.598 |