| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.506 | 0.387 | 0.391 | 2.773 |
| Arsenic | As (ppm) | 11.064 | 5.533 | 3.256 | 33.673 |
| Calcium | Ca (wt%) | 0.398 | 0.523 | 0.057 | 3.351 |
| Copper | Cu (ppm) | 3.229 | 0.958 | 1.103 | 6.891 |
| Iron | Fe (wt%) | 1.972 | 0.460 | 0.727 | 3.449 |
| Mercury | Hg (ppm) | 0.011 | 0.001 | 0.010 | 0.018 |
| Magnesium | Mg (wt%) | 0.099 | 0.026 | 0.024 | 0.211 |
| Manganese | Mn (ppm) | 535.937 | 158.522 | 240.951 | 1341.750 |
| Sodium | Na (wt%) | 0.120 | 0.045 | 0.022 | 0.272 |
| Phosphorus | P (wt%) | 0.027 | 0.009 | 0.009 | 0.058 |
| Lead | Pb (ppm) | 18.696 | 4.263 | 4.130 | 34.202 |
| Selenium | Se (ppm) | 0.166 | 0.079 | 0.104 | 0.731 |
| Titanium | Ti (wt%) | 0.463 | 0.131 | 0.075 | 0.740 |
| Zinc | Zn (ppm) | 24.964 | 4.423 | 6.786 | 40.209 |