| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.689 | 0.198 | 0.169 | 1.521 |
| Arsenic | As (ppm) | 2.138 | 0.628 | 0.932 | 5.172 |
| Calcium | Ca (wt%) | 0.023 | 0.006 | 0.009 | 0.051 |
| Copper | Cu (ppm) | 1.945 | 0.505 | 1.095 | 3.915 |
| Iron | Fe (wt%) | 0.649 | 0.177 | 0.205 | 1.397 |
| Mercury | Hg (ppm) | 0.013 | 0.004 | 0.010 | 0.038 |
| Magnesium | Mg (wt%) | 0.027 | 0.012 | 0.006 | 0.086 |
| Manganese | Mn (ppm) | 102.721 | 34.149 | 27.159 | 256.124 |
| Sodium | Na (wt%) | 0.008 | 0.004 | 0.003 | 0.022 |
| Phosphorus | P (wt%) | 0.014 | 0.005 | 0.004 | 0.041 |
| Lead | Pb (ppm) | 10.003 | 3.463 | 2.484 | 28.933 |
| Selenium | Se (ppm) | 0.151 | 0.035 | 0.102 | 0.307 |
| Titanium | Ti (wt%) | 0.300 | 0.106 | 0.084 | 0.932 |
| Zinc | Zn (ppm) | 9.818 | 2.749 | 2.381 | 19.507 |