| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.500 | 0.222 | 0.150 | 1.344 |
| Arsenic | As (ppm) | 0.861 | 0.229 | 0.395 | 1.958 |
| Calcium | Ca (wt%) | 0.210 | 0.210 | 0.043 | 0.936 |
| Copper | Cu (ppm) | 1.798 | 0.569 | 1.102 | 3.801 |
| Iron | Fe (wt%) | 0.171 | 0.097 | 0.032 | 0.563 |
| Mercury | Hg (ppm) | 0.013 | 0.005 | 0.010 | 0.045 |
| Magnesium | Mg (wt%) | 0.044 | 0.037 | 0.012 | 0.194 |
| Manganese | Mn (ppm) | 37.268 | 16.789 | 14.415 | 79.097 |
| Sodium | Na (wt%) | 0.007 | 0.006 | 0.003 | 0.036 |
| Phosphorus | P (wt%) | 0.059 | 0.065 | 0.008 | 0.318 |
| Lead | Pb (ppm) | 8.239 | 2.616 | 2.783 | 21.305 |
| Selenium | Se (ppm) | 0.133 | 0.021 | 0.102 | 0.191 |
| Titanium | Ti (wt%) | 0.279 | 0.053 | 0.155 | 0.452 |
| Zinc | Zn (ppm) | 9.252 | 4.275 | 2.031 | 31.397 |