| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.651 | 0.527 | 0.479 | 3.846 |
| Arsenic | As (ppm) | 2.802 | 1.087 | 0.926 | 8.105 |
| Calcium | Ca (wt%) | 0.076 | 0.047 | 0.015 | 0.295 |
| Copper | Cu (ppm) | 4.602 | 1.250 | 2.219 | 9.683 |
| Iron | Fe (wt%) | 0.642 | 0.188 | 0.320 | 1.252 |
| Mercury | Hg (ppm) | 0.023 | 0.007 | 0.011 | 0.047 |
| Magnesium | Mg (wt%) | 0.090 | 0.044 | 0.018 | 0.272 |
| Manganese | Mn (ppm) | 158.190 | 82.638 | 48.906 | 548.549 |
| Sodium | Na (wt%) | 0.178 | 0.135 | 0.029 | 0.822 |
| Phosphorus | P (wt%) | 0.014 | 0.006 | 0.005 | 0.042 |
| Lead | Pb (ppm) | 10.772 | 3.268 | 4.201 | 19.220 |
| Selenium | Se (ppm) | 0.172 | 0.048 | 0.102 | 0.333 |
| Titanium | Ti (wt%) | 0.237 | 0.032 | 0.111 | 0.305 |
| Zinc | Zn (ppm) | 18.221 | 6.938 | 6.466 | 47.669 |