| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 1.964 | 0.624 | 1.098 | 4.783 |
| Arsenic | As (ppm) | 1.546 | 0.545 | 0.434 | 3.799 |
| Calcium | Ca (wt%) | 0.040 | 0.012 | 0.021 | 0.082 |
| Copper | Cu (ppm) | 4.132 | 1.249 | 2.192 | 9.488 |
| Iron | Fe (wt%) | 0.906 | 0.293 | 0.458 | 2.098 |
| Mercury | Hg (ppm) | 0.028 | 0.004 | 0.019 | 0.040 |
| Magnesium | Mg (wt%) | 0.031 | 0.009 | 0.018 | 0.065 |
| Manganese | Mn (ppm) | 168.888 | 28.550 | 115.598 | 254.005 |
| Sodium | Na (wt%) | 0.030 | 0.011 | 0.010 | 0.074 |
| Phosphorus | P (wt%) | 0.019 | 0.004 | 0.011 | 0.030 |
| Lead | Pb (ppm) | 19.528 | 0.928 | 16.418 | 23.657 |
| Selenium | Se (ppm) | 0.234 | 0.041 | 0.123 | 0.394 |
| Titanium | Ti (wt%) | 0.423 | 0.049 | 0.319 | 0.550 |
| Zinc | Zn (ppm) | 15.155 | 3.085 | 9.181 | 24.561 |