| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 5.063 | 0.528 | 3.454 | 7.549 |
| Arsenic | As (ppm) | 4.603 | 0.915 | 1.369 | 7.131 |
| Calcium | Ca (wt%) | 2.014 | 0.906 | 0.404 | 5.932 |
| Copper | Cu (ppm) | 9.493 | 2.863 | 1.088 | 20.773 |
| Iron | Fe (wt%) | 2.510 | 0.884 | 1.072 | 7.411 |
| Mercury | Hg (ppm) | 0.019 | 0.011 | 0.010 | 0.098 |
| Magnesium | Mg (wt%) | 0.609 | 0.206 | 0.164 | 1.354 |
| Manganese | Mn (ppm) | 457.458 | 192.621 | 120.228 | 1333.530 |
| Sodium | Na (wt%) | 1.075 | 0.318 | 0.340 | 2.299 |
| Phosphorus | P (wt%) | 0.043 | 0.009 | 0.020 | 0.102 |
| Lead | Pb (ppm) | 22.457 | 3.267 | 12.039 | 34.809 |
| Selenium | Se (ppm) | 0.192 | 0.092 | 0.100 | 0.676 |
| Titanium | Ti (wt%) | 0.317 | 0.096 | 0.153 | 0.811 |
| Zinc | Zn (ppm) | 57.385 | 16.644 | 30.006 | 138.638 |