| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.744 | 0.678 | 1.296 | 5.497 |
| Arsenic | As (ppm) | 4.288 | 1.298 | 1.723 | 7.320 |
| Calcium | Ca (wt%) | 0.611 | 0.770 | 0.068 | 3.595 |
| Copper | Cu (ppm) | 8.477 | 1.629 | 5.585 | 14.493 |
| Iron | Fe (wt%) | 1.468 | 0.405 | 0.490 | 2.384 |
| Mercury | Hg (ppm) | 0.030 | 0.010 | 0.014 | 0.078 |
| Magnesium | Mg (wt%) | 0.232 | 0.143 | 0.076 | 1.022 |
| Manganese | Mn (ppm) | 404.027 | 189.182 | 114.630 | 1067.570 |
| Sodium | Na (wt%) | 0.193 | 0.062 | 0.069 | 0.462 |
| Phosphorus | P (wt%) | 0.029 | 0.008 | 0.010 | 0.048 |
| Lead | Pb (ppm) | 18.107 | 6.372 | 9.906 | 58.295 |
| Selenium | Se (ppm) | 0.335 | 0.096 | 0.136 | 0.674 |
| Titanium | Ti (wt%) | 0.303 | 0.072 | 0.199 | 0.569 |
| Zinc | Zn (ppm) | 29.692 | 7.429 | 10.567 | 54.757 |