| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.108 | 0.327 | 0.600 | 3.115 |
| Arsenic | As (ppm) | 2.788 | 0.959 | 0.878 | 7.397 |
| Calcium | Ca (wt%) | 0.074 | 0.053 | 0.016 | 0.338 |
| Copper | Cu (ppm) | 4.182 | 1.106 | 1.264 | 11.219 |
| Iron | Fe (wt%) | 0.511 | 0.126 | 0.229 | 1.029 |
| Mercury | Hg (ppm) | 0.014 | 0.004 | 0.010 | 0.030 |
| Magnesium | Mg (wt%) | 0.070 | 0.062 | 0.021 | 0.424 |
| Manganese | Mn (ppm) | 127.585 | 35.671 | 55.486 | 307.541 |
| Sodium | Na (wt%) | 0.122 | 0.070 | 0.044 | 0.678 |
| Phosphorus | P (wt%) | 0.007 | 0.003 | 0.003 | 0.031 |
| Lead | Pb (ppm) | 8.965 | 1.147 | 6.070 | 13.322 |
| Selenium | Se (ppm) | 0.116 | 0.017 | 0.100 | 0.197 |
| Titanium | Ti (wt%) | 0.221 | 0.036 | 0.151 | 0.285 |
| Zinc | Zn (ppm) | 13.236 | 4.589 | 6.156 | 29.860 |