| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.202 | 0.434 | 0.598 | 2.871 |
| Arsenic | As (ppm) | 1.168 | 0.319 | 0.525 | 2.187 |
| Calcium | Ca (wt%) | 0.037 | 0.037 | 0.013 | 0.237 |
| Copper | Cu (ppm) | 3.416 | 1.397 | 1.263 | 9.093 |
| Iron | Fe (wt%) | 0.512 | 0.170 | 0.277 | 1.239 |
| Mercury | Hg (ppm) | 0.016 | 0.003 | 0.010 | 0.025 |
| Magnesium | Mg (wt%) | 0.020 | 0.013 | 0.004 | 0.087 |
| Manganese | Mn (ppm) | 135.169 | 58.377 | 54.757 | 414.501 |
| Sodium | Na (wt%) | 0.045 | 0.030 | 0.011 | 0.184 |
| Phosphorus | P (wt%) | 0.016 | 0.005 | 0.009 | 0.035 |
| Lead | Pb (ppm) | 14.336 | 4.478 | 2.610 | 32.733 |
| Selenium | Se (ppm) | 0.152 | 0.033 | 0.105 | 0.265 |
| Titanium | Ti (wt%) | 0.409 | 0.104 | 0.220 | 0.667 |
| Zinc | Zn (ppm) | 12.272 | 6.059 | 5.679 | 42.697 |