| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.553 | 0.495 | 1.523 | 4.809 |
| Arsenic | As (ppm) | 3.274 | 0.507 | 1.707 | 5.188 |
| Calcium | Ca (wt%) | 0.468 | 0.356 | 0.123 | 2.215 |
| Copper | Cu (ppm) | 6.855 | 1.718 | 3.144 | 14.856 |
| Iron | Fe (wt%) | 1.072 | 0.238 | 0.532 | 2.144 |
| Mercury | Hg (ppm) | 0.011 | 0.003 | 0.010 | 0.033 |
| Magnesium | Mg (wt%) | 0.228 | 0.080 | 0.104 | 0.574 |
| Manganese | Mn (ppm) | 126.508 | 34.070 | 56.215 | 288.780 |
| Sodium | Na (wt%) | 0.222 | 0.056 | 0.107 | 0.494 |
| Phosphorus | P (wt%) | 0.017 | 0.007 | 0.008 | 0.057 |
| Lead | Pb (ppm) | 10.051 | 2.568 | 6.011 | 22.874 |
| Selenium | Se (ppm) | 0.147 | 0.055 | 0.100 | 0.300 |
| Titanium | Ti (wt%) | 0.161 | 0.025 | 0.094 | 0.255 |
| Zinc | Zn (ppm) | 30.845 | 8.501 | 15.043 | 64.137 |