| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.778 | 0.598 | 0.103 | 3.386 |
| Arsenic | As (ppm) | 1.484 | 0.481 | 0.837 | 3.438 |
| Calcium | Ca (wt%) | 0.018 | 0.013 | 0.003 | 0.065 |
| Copper | Cu (ppm) | 1.785 | 0.860 | 1.004 | 5.057 |
| Iron | Fe (wt%) | 0.333 | 0.313 | 0.036 | 1.642 |
| Mercury | Hg (ppm) | 0.014 | 0.006 | 0.010 | 0.041 |
| Magnesium | Mg (wt%) | 0.013 | 0.010 | 0.003 | 0.054 |
| Manganese | Mn (ppm) | 39.757 | 34.103 | 7.319 | 151.384 |
| Sodium | Na (wt%) | 0.004 | 0.002 | 0.003 | 0.010 |
| Phosphorus | P (wt%) | 0.010 | 0.007 | 0.003 | 0.034 |
| Lead | Pb (ppm) | 10.451 | 4.178 | 3.683 | 26.336 |
| Selenium | Se (ppm) | 0.151 | 0.071 | 0.100 | 0.500 |
| Titanium | Ti (wt%) | 0.317 | 0.075 | 0.136 | 0.585 |
| Zinc | Zn (ppm) | 7.795 | 4.119 | 1.287 | 24.372 |