| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.336 | 0.225 | 0.085 | 1.449 |
| Arsenic | As (ppm) | 1.304 | 0.438 | 0.458 | 3.357 |
| Calcium | Ca (wt%) | 1.017 | 0.977 | 0.066 | 6.548 |
| Copper | Cu (ppm) | 3.098 | 1.891 | 1.127 | 16.629 |
| Iron | Fe (wt%) | 0.152 | 0.095 | 0.032 | 0.647 |
| Mercury | Hg (ppm) | 0.016 | 0.006 | 0.010 | 0.052 |
| Magnesium | Mg (wt%) | 0.157 | 0.201 | 0.007 | 1.334 |
| Manganese | Mn (ppm) | 19.224 | 8.625 | 2.652 | 53.771 |
| Sodium | Na (wt%) | 0.027 | 0.030 | 0.003 | 0.164 |
| Phosphorus | P (wt%) | 0.082 | 0.066 | 0.009 | 0.442 |
| Lead | Pb (ppm) | 27.424 | 52.201 | 2.167 | 433.998 |
| Selenium | Se (ppm) | 0.198 | 0.106 | 0.102 | 0.635 |
| Titanium | Ti (wt%) | 0.134 | 0.031 | 0.061 | 0.216 |
| Zinc | Zn (ppm) | 9.828 | 8.979 | 2.345 | 74.384 |