| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.794 | 1.060 | 1.159 | 5.740 |
| Arsenic | As (ppm) | 5.134 | 2.415 | 1.405 | 9.907 |
| Calcium | Ca (wt%) | 0.270 | 0.180 | 0.051 | 0.834 |
| Copper | Cu (ppm) | 5.729 | 1.706 | 1.987 | 9.555 |
| Iron | Fe (wt%) | 0.988 | 0.414 | 0.342 | 2.399 |
| Mercury | Hg (ppm) | 0.031 | 0.010 | 0.012 | 0.067 |
| Magnesium | Mg (wt%) | 0.184 | 0.122 | 0.036 | 0.623 |
| Manganese | Mn (ppm) | 260.553 | 97.867 | 90.318 | 587.527 |
| Sodium | Na (wt%) | 0.498 | 0.254 | 0.120 | 1.065 |
| Phosphorus | P (wt%) | 0.026 | 0.014 | 0.005 | 0.072 |
| Lead | Pb (ppm) | 14.850 | 4.391 | 5.626 | 28.917 |
| Selenium | Se (ppm) | 0.178 | 0.040 | 0.101 | 0.291 |
| Titanium | Ti (wt%) | 0.255 | 0.026 | 0.203 | 0.307 |
| Zinc | Zn (ppm) | 24.916 | 10.229 | 8.450 | 60.349 |