| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 7.419 | 0.647 | 5.060 | 8.494 |
| Arsenic | As (ppm) | 7.884 | 5.692 | 2.238 | 32.568 |
| Calcium | Ca (wt%) | 3.123 | 1.009 | 1.681 | 9.824 |
| Copper | Cu (ppm) | 5.996 | 2.728 | 1.021 | 17.420 |
| Iron | Fe (wt%) | 5.251 | 1.992 | 2.379 | 16.098 |
| Mercury | Hg (ppm) | 0.029 | 0.008 | 0.010 | 0.058 |
| Magnesium | Mg (wt%) | 0.889 | 0.184 | 0.442 | 1.413 |
| Manganese | Mn (ppm) | 997.904 | 198.109 | 508.009 | 1726.540 |
| Sodium | Na (wt%) | 1.760 | 0.282 | 0.738 | 2.295 |
| Phosphorus | P (wt%) | 0.108 | 0.021 | 0.055 | 0.186 |
| Lead | Pb (ppm) | 34.067 | 8.654 | 22.069 | 79.673 |
| Selenium | Se (ppm) | 0.321 | 0.269 | 0.102 | 2.184 |
| Titanium | Ti (wt%) | 0.531 | 0.133 | 0.302 | 1.176 |
| Zinc | Zn (ppm) | 111.551 | 26.839 | 71.834 | 234.818 |