| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.828 | 0.429 | 0.268 | 2.830 |
| Arsenic | As (ppm) | 2.711 | 0.767 | 1.198 | 5.936 |
| Calcium | Ca (wt%) | 0.058 | 0.055 | 0.013 | 0.466 |
| Copper | Cu (ppm) | 3.052 | 0.673 | 1.178 | 5.515 |
| Iron | Fe (wt%) | 0.592 | 0.265 | 0.206 | 1.464 |
| Mercury | Hg (ppm) | 0.013 | 0.005 | 0.010 | 0.036 |
| Magnesium | Mg (wt%) | 0.039 | 0.029 | 0.010 | 0.159 |
| Manganese | Mn (ppm) | 270.207 | 92.571 | 70.015 | 611.881 |
| Sodium | Na (wt%) | 0.034 | 0.016 | 0.007 | 0.097 |
| Phosphorus | P (wt%) | 0.010 | 0.004 | 0.003 | 0.027 |
| Lead | Pb (ppm) | 12.427 | 2.849 | 5.787 | 22.533 |
| Selenium | Se (ppm) | 0.155 | 0.065 | 0.100 | 0.452 |
| Titanium | Ti (wt%) | 0.329 | 0.053 | 0.105 | 0.550 |
| Zinc | Zn (ppm) | 15.147 | 5.753 | 5.967 | 43.386 |