| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.182 | 0.392 | 0.437 | 2.895 |
| Arsenic | As (ppm) | 3.392 | 1.881 | 1.066 | 14.610 |
| Calcium | Ca (wt%) | 0.080 | 0.048 | 0.017 | 0.334 |
| Copper | Cu (ppm) | 3.715 | 0.858 | 1.383 | 6.862 |
| Iron | Fe (wt%) | 0.553 | 0.257 | 0.182 | 2.063 |
| Mercury | Hg (ppm) | 0.012 | 0.003 | 0.010 | 0.029 |
| Magnesium | Mg (wt%) | 0.056 | 0.025 | 0.016 | 0.175 |
| Manganese | Mn (ppm) | 104.922 | 42.463 | 32.787 | 246.954 |
| Sodium | Na (wt%) | 0.074 | 0.041 | 0.013 | 0.219 |
| Phosphorus | P (wt%) | 0.007 | 0.002 | 0.005 | 0.015 |
| Lead | Pb (ppm) | 13.095 | 3.561 | 7.044 | 27.643 |
| Selenium | Se (ppm) | 0.197 | 0.051 | 0.102 | 0.387 |
| Titanium | Ti (wt%) | 0.295 | 0.052 | 0.213 | 0.589 |
| Zinc | Zn (ppm) | 14.192 | 4.598 | 5.898 | 38.284 |