| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.799 | 0.387 | 0.120 | 2.394 |
| Arsenic | As (ppm) | 2.249 | 0.773 | 1.223 | 5.238 |
| Calcium | Ca (wt%) | 0.034 | 0.024 | 0.006 | 0.145 |
| Copper | Cu (ppm) | 3.654 | 0.946 | 1.210 | 6.505 |
| Iron | Fe (wt%) | 0.429 | 0.181 | 0.094 | 1.218 |
| Mercury | Hg (ppm) | 0.017 | 0.008 | 0.010 | 0.053 |
| Magnesium | Mg (wt%) | 0.055 | 0.041 | 0.012 | 0.282 |
| Manganese | Mn (ppm) | 61.103 | 27.566 | 20.123 | 174.961 |
| Sodium | Na (wt%) | 0.041 | 0.030 | 0.004 | 0.172 |
| Phosphorus | P (wt%) | 0.008 | 0.004 | 0.003 | 0.023 |
| Lead | Pb (ppm) | 13.028 | 5.882 | 2.888 | 43.500 |
| Selenium | Se (ppm) | 0.204 | 0.090 | 0.103 | 0.622 |
| Titanium | Ti (wt%) | 0.255 | 0.056 | 0.117 | 0.467 |
| Zinc | Zn (ppm) | 12.380 | 7.791 | 2.664 | 55.985 |