| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.984 | 0.656 | 0.171 | 4.449 |
| Arsenic | As (ppm) | 1.882 | 0.821 | 0.920 | 6.814 |
| Calcium | Ca (wt%) | 0.036 | 0.021 | 0.003 | 0.097 |
| Copper | Cu (ppm) | 2.157 | 1.534 | 1.007 | 10.594 |
| Iron | Fe (wt%) | 0.332 | 0.195 | 0.069 | 1.388 |
| Mercury | Hg (ppm) | 0.014 | 0.005 | 0.010 | 0.049 |
| Magnesium | Mg (wt%) | 0.019 | 0.009 | 0.003 | 0.058 |
| Manganese | Mn (ppm) | 53.492 | 32.399 | 10.026 | 185.446 |
| Sodium | Na (wt%) | 0.005 | 0.002 | 0.003 | 0.019 |
| Phosphorus | P (wt%) | 0.027 | 0.020 | 0.003 | 0.128 |
| Lead | Pb (ppm) | 13.655 | 3.571 | 7.369 | 30.246 |
| Selenium | Se (ppm) | 0.138 | 0.044 | 0.100 | 0.362 |
| Titanium | Ti (wt%) | 0.363 | 0.062 | 0.147 | 0.589 |
| Zinc | Zn (ppm) | 9.270 | 6.301 | 1.283 | 51.947 |