| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 4.092 | 0.410 | 2.772 | 5.369 |
| Arsenic | As (ppm) | 6.977 | 2.322 | 3.416 | 13.698 |
| Calcium | Ca (wt%) | 0.434 | 0.140 | 0.224 | 0.802 |
| Copper | Cu (ppm) | 11.611 | 2.707 | 4.438 | 17.980 |
| Iron | Fe (wt%) | 1.367 | 0.168 | 1.052 | 1.915 |
| Mercury | Hg (ppm) | 0.032 | 0.005 | 0.020 | 0.047 |
| Magnesium | Mg (wt%) | 0.241 | 0.042 | 0.127 | 0.400 |
| Manganese | Mn (ppm) | 432.683 | 155.597 | 152.463 | 965.466 |
| Sodium | Na (wt%) | 0.834 | 0.177 | 0.521 | 1.170 |
| Phosphorus | P (wt%) | 0.038 | 0.016 | 0.018 | 0.093 |
| Lead | Pb (ppm) | 16.993 | 2.071 | 12.015 | 23.624 |
| Selenium | Se (ppm) | 0.301 | 0.080 | 0.101 | 0.543 |
| Titanium | Ti (wt%) | 0.291 | 0.041 | 0.185 | 0.363 |
| Zinc | Zn (ppm) | 41.098 | 7.730 | 20.807 | 66.579 |