| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 5.253 | 0.715 | 3.161 | 7.177 |
| Arsenic | As (ppm) | 5.842 | 1.007 | 3.407 | 8.488 |
| Calcium | Ca (wt%) | 2.232 | 0.939 | 0.626 | 5.205 |
| Copper | Cu (ppm) | 14.219 | 2.588 | 8.703 | 21.524 |
| Iron | Fe (wt%) | 2.261 | 0.391 | 1.246 | 3.331 |
| Mercury | Hg (ppm) | 0.012 | 0.002 | 0.010 | 0.022 |
| Magnesium | Mg (wt%) | 1.296 | 0.492 | 0.346 | 2.811 |
| Manganese | Mn (ppm) | 367.590 | 44.882 | 233.252 | 456.788 |
| Sodium | Na (wt%) | 0.563 | 0.034 | 0.437 | 0.663 |
| Phosphorus | P (wt%) | 0.043 | 0.008 | 0.023 | 0.060 |
| Lead | Pb (ppm) | 18.047 | 2.329 | 11.557 | 26.042 |
| Selenium | Se (ppm) | 0.265 | 0.078 | 0.100 | 0.563 |
| Titanium | Ti (wt%) | 0.279 | 0.017 | 0.212 | 0.317 |
| Zinc | Zn (ppm) | 43.257 | 6.727 | 23.585 | 62.430 |