| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.896 | 0.572 | 0.092 | 3.158 |
| Arsenic | As (ppm) | 1.270 | 0.587 | 0.370 | 4.861 |
| Calcium | Ca (wt%) | 0.099 | 0.146 | 0.010 | 1.578 |
| Copper | Cu (ppm) | 2.071 | 0.958 | 1.012 | 4.108 |
| Iron | Fe (wt%) | 0.403 | 0.213 | 0.050 | 1.244 |
| Mercury | Hg (ppm) | 0.018 | 0.010 | 0.010 | 0.073 |
| Magnesium | Mg (wt%) | 0.055 | 0.074 | 0.004 | 0.793 |
| Manganese | Mn (ppm) | 95.505 | 50.701 | 14.871 | 202.358 |
| Sodium | Na (wt%) | 0.010 | 0.005 | 0.003 | 0.026 |
| Phosphorus | P (wt%) | 0.028 | 0.022 | 0.004 | 0.077 |
| Lead | Pb (ppm) | 8.957 | 3.756 | 2.767 | 26.022 |
| Selenium | Se (ppm) | 0.153 | 0.049 | 0.100 | 0.406 |
| Titanium | Ti (wt%) | 0.261 | 0.075 | 0.082 | 0.446 |
| Zinc | Zn (ppm) | 10.766 | 5.135 | 2.714 | 22.052 |