| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.815 | 0.282 | 0.212 | 1.696 |
| Arsenic | As (ppm) | 7.524 | 3.207 | 1.976 | 24.803 |
| Calcium | Ca (wt%) | 0.151 | 0.239 | 0.010 | 1.858 |
| Copper | Cu (ppm) | 2.354 | 0.653 | 1.107 | 4.779 |
| Iron | Fe (wt%) | 1.734 | 0.608 | 0.536 | 3.607 |
| Mercury | Hg (ppm) | 0.010 | 0.000 | 0.010 | 0.010 |
| Magnesium | Mg (wt%) | 0.058 | 0.024 | 0.008 | 0.132 |
| Manganese | Mn (ppm) | 510.142 | 179.257 | 91.996 | 1139.040 |
| Sodium | Na (wt%) | 0.045 | 0.023 | 0.007 | 0.146 |
| Phosphorus | P (wt%) | 0.016 | 0.012 | 0.003 | 0.084 |
| Lead | Pb (ppm) | 18.402 | 5.853 | 2.059 | 41.179 |
| Selenium | Se (ppm) | 0.152 | 0.049 | 0.100 | 0.385 |
| Titanium | Ti (wt%) | 0.489 | 0.183 | 0.035 | 1.107 |
| Zinc | Zn (ppm) | 23.289 | 6.966 | 6.051 | 41.967 |