| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.457 | 0.170 | 0.139 | 1.135 |
| Arsenic | As (ppm) | 1.253 | 0.264 | 0.406 | 2.283 |
| Calcium | Ca (wt%) | 0.373 | 0.402 | 0.019 | 3.089 |
| Copper | Cu (ppm) | 3.606 | 4.830 | 1.009 | 45.052 |
| Iron | Fe (wt%) | 0.449 | 0.199 | 0.109 | 1.516 |
| Mercury | Hg (ppm) | 0.010 | 0.000 | 0.010 | 0.013 |
| Magnesium | Mg (wt%) | 0.021 | 0.012 | 0.005 | 0.081 |
| Manganese | Mn (ppm) | 169.689 | 89.541 | 34.148 | 689.481 |
| Sodium | Na (wt%) | 0.056 | 0.028 | 0.004 | 0.130 |
| Phosphorus | P (wt%) | 0.017 | 0.018 | 0.003 | 0.158 |
| Lead | Pb (ppm) | 21.698 | 6.563 | 11.943 | 59.099 |
| Selenium | Se (ppm) | 0.151 | 0.076 | 0.100 | 0.796 |
| Titanium | Ti (wt%) | 0.554 | 0.169 | 0.315 | 1.411 |
| Zinc | Zn (ppm) | 17.628 | 11.489 | 6.043 | 86.540 |