| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 5.371 | 0.378 | 4.363 | 6.318 |
| Arsenic | As (ppm) | 11.395 | 2.577 | 5.514 | 22.191 |
| Calcium | Ca (wt%) | 0.681 | 0.145 | 0.400 | 1.008 |
| Copper | Cu (ppm) | 12.442 | 1.730 | 8.360 | 18.018 |
| Iron | Fe (wt%) | 1.925 | 0.236 | 1.397 | 2.657 |
| Mercury | Hg (ppm) | 0.025 | 0.005 | 0.010 | 0.038 |
| Magnesium | Mg (wt%) | 0.559 | 0.162 | 0.303 | 0.994 |
| Manganese | Mn (ppm) | 393.294 | 51.289 | 275.134 | 541.516 |
| Sodium | Na (wt%) | 0.864 | 0.082 | 0.668 | 1.074 |
| Phosphorus | P (wt%) | 0.057 | 0.008 | 0.040 | 0.084 |
| Lead | Pb (ppm) | 16.163 | 2.436 | 11.100 | 23.315 |
| Selenium | Se (ppm) | 0.370 | 0.100 | 0.107 | 0.856 |
| Titanium | Ti (wt%) | 0.285 | 0.019 | 0.233 | 0.341 |
| Zinc | Zn (ppm) | 59.924 | 7.903 | 44.680 | 84.843 |