| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.094 | 0.509 | 0.786 | 3.875 |
| Arsenic | As (ppm) | 8.407 | 3.262 | 3.100 | 23.221 |
| Calcium | Ca (wt%) | 2.103 | 1.248 | 0.134 | 4.672 |
| Copper | Cu (ppm) | 10.118 | 2.732 | 1.131 | 18.094 |
| Iron | Fe (wt%) | 1.636 | 0.626 | 0.502 | 4.559 |
| Mercury | Hg (ppm) | 0.027 | 0.011 | 0.005 | 0.044 |
| Magnesium | Mg (wt%) | 1.065 | 0.626 | 0.054 | 2.278 |
| Manganese | Mn (ppm) | 830.497 | 248.111 | 254.918 | 1425.670 |
| Sodium | Na (wt%) | 0.079 | 0.025 | 0.030 | 0.156 |
| Phosphorus | P (wt%) | 0.032 | 0.006 | 0.012 | 0.064 |
| Lead | Pb (ppm) | 18.790 | 3.860 | 6.207 | 27.595 |
| Selenium | Se (ppm) | 0.364 | 0.104 | 0.103 | 0.758 |
| Titanium | Ti (wt%) | 0.127 | 0.026 | 0.068 | 0.231 |
| Zinc | Zn (ppm) | 43.981 | 8.976 | 17.743 | 84.617 |