| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 3.453 | 1.072 | 1.949 | 8.240 |
| Arsenic | As (ppm) | 4.901 | 2.190 | 1.517 | 12.108 |
| Calcium | Ca (wt%) | 0.166 | 0.082 | 0.045 | 0.428 |
| Copper | Cu (ppm) | 10.172 | 3.247 | 5.147 | 26.618 |
| Iron | Fe (wt%) | 1.338 | 0.450 | 0.693 | 3.644 |
| Mercury | Hg (ppm) | 0.032 | 0.009 | 0.010 | 0.070 |
| Magnesium | Mg (wt%) | 0.243 | 0.198 | 0.075 | 1.215 |
| Manganese | Mn (ppm) | 411.928 | 207.317 | 100.621 | 1134.720 |
| Sodium | Na (wt%) | 0.388 | 0.221 | 0.097 | 0.877 |
| Phosphorus | P (wt%) | 0.028 | 0.012 | 0.010 | 0.067 |
| Lead | Pb (ppm) | 15.994 | 2.835 | 9.025 | 25.642 |
| Selenium | Se (ppm) | 0.291 | 0.096 | 0.104 | 0.578 |
| Titanium | Ti (wt%) | 0.323 | 0.025 | 0.246 | 0.410 |
| Zinc | Zn (ppm) | 35.202 | 11.438 | 13.278 | 81.078 |