| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.806 | 0.379 | 0.156 | 3.584 |
| Arsenic | As (ppm) | 0.826 | 0.302 | 0.312 | 2.883 |
| Calcium | Ca (wt%) | 0.386 | 0.295 | 0.034 | 1.911 |
| Copper | Cu (ppm) | 2.218 | 0.578 | 1.012 | 5.141 |
| Iron | Fe (wt%) | 0.260 | 0.145 | 0.019 | 1.393 |
| Mercury | Hg (ppm) | 0.019 | 0.010 | 0.010 | 0.078 |
| Magnesium | Mg (wt%) | 0.034 | 0.015 | 0.006 | 0.139 |
| Manganese | Mn (ppm) | 73.866 | 45.107 | 6.934 | 375.380 |
| Sodium | Na (wt%) | 0.007 | 0.003 | 0.003 | 0.028 |
| Phosphorus | P (wt%) | 0.068 | 0.043 | 0.008 | 0.279 |
| Lead | Pb (ppm) | 11.762 | 5.214 | 2.430 | 39.619 |
| Selenium | Se (ppm) | 0.141 | 0.090 | 0.100 | 0.800 |
| Titanium | Ti (wt%) | 0.265 | 0.064 | 0.112 | 0.699 |
| Zinc | Zn (ppm) | 11.472 | 4.763 | 2.975 | 35.278 |