| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.725 | 0.251 | 0.222 | 1.517 |
| Arsenic | As (ppm) | 2.392 | 0.864 | 0.989 | 4.929 |
| Calcium | Ca (wt%) | 0.077 | 0.085 | 0.018 | 0.585 |
| Copper | Cu (ppm) | 1.656 | 0.499 | 1.008 | 3.106 |
| Iron | Fe (wt%) | 0.781 | 0.243 | 0.407 | 1.702 |
| Mercury | Hg (ppm) | 0.010 | 0.001 | 0.010 | 0.016 |
| Magnesium | Mg (wt%) | 0.043 | 0.016 | 0.010 | 0.114 |
| Manganese | Mn (ppm) | 190.006 | 81.196 | 56.777 | 621.576 |
| Sodium | Na (wt%) | 0.038 | 0.020 | 0.007 | 0.128 |
| Phosphorus | P (wt%) | 0.011 | 0.005 | 0.004 | 0.032 |
| Lead | Pb (ppm) | 14.176 | 2.507 | 3.890 | 20.674 |
| Selenium | Se (ppm) | 0.117 | 0.029 | 0.100 | 0.261 |
| Titanium | Ti (wt%) | 0.388 | 0.068 | 0.081 | 0.566 |
| Zinc | Zn (ppm) | 13.980 | 8.467 | 6.123 | 85.771 |