| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.224 | 0.179 | 0.033 | 1.267 |
| Arsenic | As (ppm) | 1.106 | 0.275 | 0.680 | 2.491 |
| Calcium | Ca (wt%) | 0.006 | 0.004 | 0.003 | 0.022 |
| Copper | Cu (ppm) | 1.534 | 0.590 | 1.000 | 5.313 |
| Iron | Fe (wt%) | 0.092 | 0.115 | 0.010 | 0.758 |
| Mercury | Hg (ppm) | 0.012 | 0.004 | 0.010 | 0.049 |
| Magnesium | Mg (wt%) | 0.005 | 0.003 | 0.003 | 0.017 |
| Manganese | Mn (ppm) | 13.907 | 10.312 | 2.352 | 50.614 |
| Sodium | Na (wt%) | 0.003 | 0.001 | 0.003 | 0.009 |
| Phosphorus | P (wt%) | 0.005 | 0.002 | 0.003 | 0.015 |
| Lead | Pb (ppm) | 8.263 | 2.653 | 2.922 | 15.057 |
| Selenium | Se (ppm) | 0.124 | 0.035 | 0.100 | 0.388 |
| Titanium | Ti (wt%) | 0.282 | 0.078 | 0.129 | 0.467 |
| Zinc | Zn (ppm) | 2.702 | 1.276 | 1.000 | 8.266 |