| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.155 | 0.512 | 2.457 | 4.497 |
| Arsenic | As (ppm) | 4.809 | 1.094 | 3.000 | 6.823 |
| Calcium | Ca (wt%) | 0.782 | 0.599 | 0.221 | 2.338 |
| Copper | Cu (ppm) | 10.199 | 2.019 | 7.355 | 14.204 |
| Iron | Fe (wt%) | 1.316 | 0.242 | 0.950 | 1.855 |
| Mercury | Hg (ppm) | 0.010 | 0.000 | 0.010 | 0.010 |
| Magnesium | Mg (wt%) | 0.330 | 0.098 | 0.200 | 0.543 |
| Manganese | Mn (ppm) | 201.325 | 51.513 | 133.114 | 332.030 |
| Sodium | Na (wt%) | 0.327 | 0.079 | 0.234 | 0.583 |
| Phosphorus | P (wt%) | 0.023 | 0.006 | 0.014 | 0.040 |
| Lead | Pb (ppm) | 12.117 | 2.122 | 9.361 | 18.180 |
| Selenium | Se (ppm) | 0.139 | 0.044 | 0.100 | 0.297 |
| Titanium | Ti (wt%) | 0.208 | 0.029 | 0.159 | 0.273 |
| Zinc | Zn (ppm) | 38.346 | 6.782 | 26.527 | 56.407 |