| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.595 | 0.597 | 0.964 | 3.987 |
| Arsenic | As (ppm) | 5.033 | 1.159 | 1.745 | 8.398 |
| Calcium | Ca (wt%) | 1.243 | 1.220 | 0.130 | 8.506 |
| Copper | Cu (ppm) | 5.059 | 1.847 | 1.026 | 11.572 |
| Iron | Fe (wt%) | 1.092 | 0.222 | 0.415 | 1.941 |
| Mercury | Hg (ppm) | 0.015 | 0.006 | 0.010 | 0.058 |
| Magnesium | Mg (wt%) | 0.158 | 0.063 | 0.047 | 0.406 |
| Manganese | Mn (ppm) | 173.770 | 53.033 | 73.194 | 418.397 |
| Sodium | Na (wt%) | 0.363 | 0.176 | 0.050 | 0.754 |
| Phosphorus | P (wt%) | 0.015 | 0.005 | 0.005 | 0.034 |
| Lead | Pb (ppm) | 11.092 | 2.726 | 6.561 | 19.504 |
| Selenium | Se (ppm) | 0.243 | 0.082 | 0.107 | 0.720 |
| Titanium | Ti (wt%) | 0.303 | 0.049 | 0.179 | 0.550 |
| Zinc | Zn (ppm) | 24.947 | 4.756 | 13.075 | 41.157 |