| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.402 | 0.206 | 0.047 | 1.032 |
| Arsenic | As (ppm) | 1.399 | 0.258 | 0.571 | 2.015 |
| Calcium | Ca (wt%) | 0.010 | 0.005 | 0.005 | 0.034 |
| Copper | Cu (ppm) | 1.606 | 0.324 | 1.005 | 2.612 |
| Iron | Fe (wt%) | 0.156 | 0.078 | 0.018 | 0.446 |
| Mercury | Hg (ppm) | 0.012 | 0.002 | 0.010 | 0.022 |
| Magnesium | Mg (wt%) | 0.008 | 0.004 | 0.003 | 0.022 |
| Manganese | Mn (ppm) | 28.403 | 20.131 | 5.532 | 119.924 |
| Sodium | Na (wt%) | 0.004 | 0.001 | 0.003 | 0.007 |
| Phosphorus | P (wt%) | 0.008 | 0.004 | 0.003 | 0.020 |
| Lead | Pb (ppm) | 9.923 | 3.229 | 3.396 | 19.906 |
| Selenium | Se (ppm) | 0.111 | 0.013 | 0.100 | 0.171 |
| Titanium | Ti (wt%) | 0.299 | 0.077 | 0.120 | 0.571 |
| Zinc | Zn (ppm) | 4.984 | 1.629 | 1.500 | 9.310 |