| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 2.188 | 0.915 | 0.465 | 6.185 |
| Arsenic | As (ppm) | 9.206 | 3.080 | 3.384 | 19.688 |
| Calcium | Ca (wt%) | 1.401 | 1.542 | 0.093 | 8.731 |
| Copper | Cu (ppm) | 4.780 | 2.208 | 1.306 | 13.303 |
| Iron | Fe (wt%) | 1.920 | 0.449 | 0.750 | 3.482 |
| Mercury | Hg (ppm) | 0.010 | 0.000 | 0.010 | 0.011 |
| Magnesium | Mg (wt%) | 0.141 | 0.050 | 0.029 | 0.301 |
| Manganese | Mn (ppm) | 519.460 | 134.639 | 204.177 | 905.170 |
| Sodium | Na (wt%) | 0.120 | 0.041 | 0.025 | 0.263 |
| Phosphorus | P (wt%) | 0.041 | 0.017 | 0.017 | 0.117 |
| Lead | Pb (ppm) | 19.677 | 5.128 | 4.239 | 33.046 |
| Selenium | Se (ppm) | 0.260 | 0.103 | 0.100 | 0.578 |
| Titanium | Ti (wt%) | 0.431 | 0.100 | 0.099 | 0.694 |
| Zinc | Zn (ppm) | 30.169 | 9.770 | 8.582 | 72.822 |