| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.067 | 0.533 | 0.390 | 3.273 |
| Arsenic | As (ppm) | 2.508 | 1.018 | 0.870 | 5.709 |
| Calcium | Ca (wt%) | 0.037 | 0.017 | 0.016 | 0.116 |
| Copper | Cu (ppm) | 3.213 | 1.188 | 1.065 | 7.747 |
| Iron | Fe (wt%) | 0.706 | 0.175 | 0.298 | 1.296 |
| Mercury | Hg (ppm) | 0.014 | 0.004 | 0.010 | 0.030 |
| Magnesium | Mg (wt%) | 0.052 | 0.035 | 0.020 | 0.234 |
| Manganese | Mn (ppm) | 134.506 | 41.687 | 58.881 | 284.610 |
| Sodium | Na (wt%) | 0.055 | 0.048 | 0.011 | 0.342 |
| Phosphorus | P (wt%) | 0.007 | 0.002 | 0.006 | 0.020 |
| Lead | Pb (ppm) | 8.699 | 2.197 | 4.024 | 16.543 |
| Selenium | Se (ppm) | 0.165 | 0.065 | 0.100 | 0.383 |
| Titanium | Ti (wt%) | 0.248 | 0.028 | 0.189 | 0.332 |
| Zinc | Zn (ppm) | 14.615 | 5.971 | 8.584 | 41.363 |