| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.627 | 0.234 | 0.147 | 1.513 |
| Arsenic | As (ppm) | 2.597 | 1.333 | 0.300 | 6.061 |
| Calcium | Ca (wt%) | 0.052 | 0.021 | 0.019 | 0.156 |
| Copper | Cu (ppm) | 6.259 | 4.708 | 2.186 | 30.867 |
| Iron | Fe (wt%) | 0.731 | 0.399 | 0.090 | 2.032 |
| Mercury | Hg (ppm) | 0.006 | 0.002 | 0.005 | 0.010 |
| Magnesium | Mg (wt%) | 0.042 | 0.016 | 0.011 | 0.099 |
| Manganese | Mn (ppm) | 274.736 | 80.509 | 34.078 | 442.284 |
| Sodium | Na (wt%) | 0.048 | 0.034 | 0.005 | 0.222 |
| Phosphorus | P (wt%) | 0.016 | 0.009 | 0.003 | 0.059 |
| Lead | Pb (ppm) | 8.913 | 5.374 | 2.001 | 30.971 |
| Selenium | Se (ppm) | 0.126 | 0.029 | 0.100 | 0.275 |
| Titanium | Ti (wt%) | 0.264 | 0.137 | 0.056 | 0.820 |
| Zinc | Zn (ppm) | 12.644 | 2.751 | 7.249 | 19.918 |