| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.467 | 0.556 | 2.344 | 4.842 |
| Arsenic | As (ppm) | 3.960 | 1.200 | 1.820 | 6.760 |
| Calcium | Ca (wt%) | 1.885 | 0.542 | 0.631 | 3.508 |
| Copper | Cu (ppm) | 8.895 | 1.993 | 5.479 | 14.781 |
| Iron | Fe (wt%) | 1.462 | 0.255 | 0.866 | 2.157 |
| Mercury | Hg (ppm) | 0.012 | 0.003 | 0.010 | 0.022 |
| Magnesium | Mg (wt%) | 0.584 | 0.290 | 0.255 | 1.546 |
| Manganese | Mn (ppm) | 289.935 | 101.957 | 143.951 | 668.864 |
| Sodium | Na (wt%) | 0.502 | 0.106 | 0.278 | 0.788 |
| Phosphorus | P (wt%) | 0.027 | 0.007 | 0.015 | 0.042 |
| Lead | Pb (ppm) | 16.199 | 2.844 | 10.103 | 26.593 |
| Selenium | Se (ppm) | 0.196 | 0.078 | 0.100 | 0.391 |
| Titanium | Ti (wt%) | 0.206 | 0.044 | 0.133 | 0.347 |
| Zinc | Zn (ppm) | 32.497 | 9.365 | 18.123 | 59.799 |