| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.818 | 0.533 | 1.353 | 4.497 |
| Arsenic | As (ppm) | 4.418 | 2.410 | 1.480 | 17.507 |
| Calcium | Ca (wt%) | 1.081 | 0.848 | 0.122 | 4.313 |
| Copper | Cu (ppm) | 7.501 | 1.301 | 4.141 | 12.234 |
| Iron | Fe (wt%) | 1.415 | 0.325 | 0.496 | 2.096 |
| Mercury | Hg (ppm) | 0.011 | 0.002 | 0.010 | 0.019 |
| Magnesium | Mg (wt%) | 0.240 | 0.054 | 0.092 | 0.421 |
| Manganese | Mn (ppm) | 287.755 | 64.935 | 124.741 | 587.067 |
| Sodium | Na (wt%) | 0.228 | 0.054 | 0.100 | 0.419 |
| Phosphorus | P (wt%) | 0.020 | 0.005 | 0.005 | 0.037 |
| Lead | Pb (ppm) | 13.005 | 3.289 | 5.126 | 23.057 |
| Selenium | Se (ppm) | 0.150 | 0.048 | 0.100 | 0.293 |
| Titanium | Ti (wt%) | 0.176 | 0.026 | 0.100 | 0.247 |
| Zinc | Zn (ppm) | 30.546 | 8.064 | 9.465 | 51.868 |