| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.565 | 0.673 | 1.054 | 5.542 |
| Arsenic | As (ppm) | 4.548 | 0.865 | 2.305 | 7.126 |
| Calcium | Ca (wt%) | 0.519 | 0.350 | 0.044 | 1.829 |
| Copper | Cu (ppm) | 7.926 | 1.900 | 3.013 | 14.792 |
| Iron | Fe (wt%) | 1.362 | 0.236 | 0.771 | 2.137 |
| Mercury | Hg (ppm) | 0.040 | 0.004 | 0.030 | 0.052 |
| Magnesium | Mg (wt%) | 0.188 | 0.064 | 0.080 | 0.456 |
| Manganese | Mn (ppm) | 447.426 | 153.714 | 120.115 | 883.437 |
| Sodium | Na (wt%) | 0.052 | 0.015 | 0.025 | 0.107 |
| Phosphorus | P (wt%) | 0.028 | 0.022 | 0.014 | 0.131 |
| Lead | Pb (ppm) | 31.382 | 33.616 | 8.024 | 175.754 |
| Selenium | Se (ppm) | 0.347 | 0.099 | 0.201 | 0.991 |
| Titanium | Ti (wt%) | 0.205 | 0.034 | 0.114 | 0.304 |
| Zinc | Zn (ppm) | 50.711 | 10.701 | 29.074 | 97.379 |