| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.718 | 0.735 | 2.513 | 6.139 |
| Arsenic | As (ppm) | 7.666 | 1.964 | 4.510 | 13.637 |
| Calcium | Ca (wt%) | 0.353 | 0.208 | 0.092 | 1.162 |
| Copper | Cu (ppm) | 9.600 | 1.622 | 7.145 | 13.866 |
| Iron | Fe (wt%) | 2.489 | 0.473 | 1.709 | 4.110 |
| Mercury | Hg (ppm) | 0.048 | 0.005 | 0.032 | 0.059 |
| Magnesium | Mg (wt%) | 0.358 | 0.091 | 0.208 | 0.666 |
| Manganese | Mn (ppm) | 726.969 | 210.113 | 374.409 | 1419.880 |
| Sodium | Na (wt%) | 0.136 | 0.035 | 0.065 | 0.210 |
| Phosphorus | P (wt%) | 0.031 | 0.005 | 0.023 | 0.040 |
| Lead | Pb (ppm) | 18.148 | 3.764 | 12.477 | 25.660 |
| Selenium | Se (ppm) | 0.229 | 0.052 | 0.124 | 0.467 |
| Titanium | Ti (wt%) | 0.293 | 0.026 | 0.246 | 0.358 |
| Zinc | Zn (ppm) | 58.532 | 6.948 | 46.071 | 74.304 |