| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.618 | 0.283 | 0.133 | 1.753 |
| Arsenic | As (ppm) | 1.571 | 0.433 | 0.820 | 3.591 |
| Calcium | Ca (wt%) | 0.038 | 0.021 | 0.011 | 0.150 |
| Copper | Cu (ppm) | 2.536 | 1.214 | 1.044 | 7.230 |
| Iron | Fe (wt%) | 0.390 | 0.205 | 0.097 | 1.123 |
| Mercury | Hg (ppm) | 0.011 | 0.002 | 0.010 | 0.024 |
| Magnesium | Mg (wt%) | 0.034 | 0.016 | 0.008 | 0.078 |
| Manganese | Mn (ppm) | 142.102 | 93.329 | 35.040 | 646.367 |
| Sodium | Na (wt%) | 0.049 | 0.025 | 0.009 | 0.145 |
| Phosphorus | P (wt%) | 0.006 | 0.003 | 0.003 | 0.017 |
| Lead | Pb (ppm) | 8.134 | 3.091 | 2.992 | 20.272 |
| Selenium | Se (ppm) | 0.112 | 0.014 | 0.100 | 0.192 |
| Titanium | Ti (wt%) | 0.189 | 0.091 | 0.060 | 0.425 |
| Zinc | Zn (ppm) | 9.188 | 3.645 | 3.701 | 22.466 |