| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.856 | 0.577 | 2.278 | 5.272 |
| Arsenic | As (ppm) | 5.257 | 0.852 | 3.157 | 9.742 |
| Calcium | Ca (wt%) | 2.572 | 0.898 | 0.584 | 8.311 |
| Copper | Cu (ppm) | 11.747 | 1.720 | 6.453 | 16.656 |
| Iron | Fe (wt%) | 1.640 | 0.168 | 1.116 | 1.988 |
| Mercury | Hg (ppm) | 0.012 | 0.003 | 0.010 | 0.028 |
| Magnesium | Mg (wt%) | 1.114 | 0.596 | 0.237 | 2.427 |
| Manganese | Mn (ppm) | 382.239 | 114.896 | 207.176 | 1243.210 |
| Sodium | Na (wt%) | 0.660 | 0.083 | 0.482 | 0.970 |
| Phosphorus | P (wt%) | 0.040 | 0.009 | 0.011 | 0.065 |
| Lead | Pb (ppm) | 22.159 | 4.614 | 10.441 | 41.820 |
| Selenium | Se (ppm) | 0.302 | 0.268 | 0.100 | 2.497 |
| Titanium | Ti (wt%) | 0.234 | 0.011 | 0.195 | 0.306 |
| Zinc | Zn (ppm) | 33.583 | 5.807 | 15.005 | 54.515 |