| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.075 | 0.325 | 0.351 | 2.425 |
| Arsenic | As (ppm) | 2.356 | 0.505 | 1.070 | 5.029 |
| Calcium | Ca (wt%) | 0.062 | 0.025 | 0.022 | 0.186 |
| Copper | Cu (ppm) | 4.572 | 2.587 | 1.160 | 25.915 |
| Iron | Fe (wt%) | 0.727 | 0.153 | 0.359 | 1.253 |
| Mercury | Hg (ppm) | 0.013 | 0.003 | 0.010 | 0.031 |
| Magnesium | Mg (wt%) | 0.050 | 0.014 | 0.017 | 0.099 |
| Manganese | Mn (ppm) | 296.101 | 79.771 | 117.923 | 591.993 |
| Sodium | Na (wt%) | 0.099 | 0.036 | 0.026 | 0.277 |
| Phosphorus | P (wt%) | 0.013 | 0.005 | 0.005 | 0.047 |
| Lead | Pb (ppm) | 12.784 | 2.625 | 6.029 | 23.523 |
| Selenium | Se (ppm) | 0.133 | 0.035 | 0.101 | 0.332 |
| Titanium | Ti (wt%) | 0.350 | 0.097 | 0.186 | 0.902 |
| Zinc | Zn (ppm) | 16.920 | 6.614 | 6.739 | 65.443 |