| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.129 | 0.519 | 0.289 | 2.851 |
| Arsenic | As (ppm) | 4.192 | 1.477 | 1.602 | 13.134 |
| Calcium | Ca (wt%) | 0.054 | 0.022 | 0.012 | 0.176 |
| Copper | Cu (ppm) | 3.172 | 0.926 | 1.089 | 6.131 |
| Iron | Fe (wt%) | 0.943 | 0.297 | 0.243 | 2.547 |
| Mercury | Hg (ppm) | 0.013 | 0.005 | 0.010 | 0.032 |
| Magnesium | Mg (wt%) | 0.058 | 0.024 | 0.013 | 0.142 |
| Manganese | Mn (ppm) | 332.701 | 160.697 | 82.607 | 1545.480 |
| Sodium | Na (wt%) | 0.104 | 0.049 | 0.020 | 0.293 |
| Phosphorus | P (wt%) | 0.015 | 0.005 | 0.006 | 0.044 |
| Lead | Pb (ppm) | 17.382 | 3.741 | 2.482 | 28.930 |
| Selenium | Se (ppm) | 0.142 | 0.046 | 0.100 | 0.290 |
| Titanium | Ti (wt%) | 0.426 | 0.079 | 0.055 | 0.666 |
| Zinc | Zn (ppm) | 17.173 | 5.594 | 4.406 | 34.945 |