| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.157 | 0.077 | 0.023 | 0.682 |
| Arsenic | As (ppm) | 0.961 | 0.178 | 0.404 | 1.649 |
| Calcium | Ca (wt%) | 0.799 | 1.042 | 0.028 | 7.441 |
| Copper | Cu (ppm) | 3.678 | 1.985 | 1.028 | 12.990 |
| Iron | Fe (wt%) | 0.077 | 0.062 | 0.003 | 0.481 |
| Mercury | Hg (ppm) | 0.011 | 0.001 | 0.010 | 0.019 |
| Magnesium | Mg (wt%) | 0.031 | 0.028 | 0.003 | 0.139 |
| Manganese | Mn (ppm) | 12.201 | 6.953 | 2.226 | 52.094 |
| Sodium | Na (wt%) | 0.012 | 0.013 | 0.003 | 0.079 |
| Phosphorus | P (wt%) | 0.035 | 0.031 | 0.003 | 0.244 |
| Lead | Pb (ppm) | 9.036 | 11.836 | 2.034 | 114.547 |
| Selenium | Se (ppm) | 0.131 | 0.048 | 0.100 | 0.458 |
| Titanium | Ti (wt%) | 0.152 | 0.038 | 0.063 | 0.253 |
| Zinc | Zn (ppm) | 8.638 | 6.780 | 1.164 | 39.254 |