| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.103 | 0.761 | 0.840 | 5.151 |
| Arsenic | As (ppm) | 4.445 | 2.093 | 1.075 | 16.035 |
| Calcium | Ca (wt%) | 0.099 | 0.136 | 0.016 | 1.289 |
| Copper | Cu (ppm) | 7.367 | 2.515 | 2.970 | 26.274 |
| Iron | Fe (wt%) | 1.503 | 0.372 | 0.685 | 2.658 |
| Mercury | Hg (ppm) | 0.046 | 0.009 | 0.017 | 0.090 |
| Magnesium | Mg (wt%) | 0.106 | 0.067 | 0.026 | 0.438 |
| Manganese | Mn (ppm) | 347.740 | 144.365 | 146.231 | 2163.340 |
| Sodium | Na (wt%) | 0.048 | 0.030 | 0.015 | 0.158 |
| Phosphorus | P (wt%) | 0.014 | 0.005 | 0.004 | 0.048 |
| Lead | Pb (ppm) | 25.663 | 15.828 | 10.207 | 278.081 |
| Selenium | Se (ppm) | 0.285 | 0.141 | 0.101 | 0.888 |
| Titanium | Ti (wt%) | 0.414 | 0.090 | 0.177 | 0.906 |
| Zinc | Zn (ppm) | 33.575 | 19.869 | 16.765 | 385.477 |