| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.169 | 0.062 | 0.050 | 0.485 |
| Arsenic | As (ppm) | 1.774 | 0.463 | 0.813 | 3.680 |
| Calcium | Ca (wt%) | 0.005 | 0.003 | 0.003 | 0.026 |
| Copper | Cu (ppm) | 1.493 | 0.596 | 1.000 | 5.967 |
| Iron | Fe (wt%) | 0.041 | 0.017 | 0.010 | 0.130 |
| Mercury | Hg (ppm) | 0.012 | 0.003 | 0.010 | 0.030 |
| Magnesium | Mg (wt%) | 0.004 | 0.001 | 0.003 | 0.011 |
| Manganese | Mn (ppm) | 9.434 | 5.961 | 2.057 | 36.157 |
| Sodium | Na (wt%) | 0.004 | 0.003 | 0.003 | 0.027 |
| Phosphorus | P (wt%) | 0.005 | 0.001 | 0.003 | 0.009 |
| Lead | Pb (ppm) | 10.757 | 5.729 | 5.034 | 48.933 |
| Selenium | Se (ppm) | 0.105 | 0.009 | 0.100 | 0.200 |
| Titanium | Ti (wt%) | 0.292 | 0.040 | 0.193 | 0.375 |
| Zinc | Zn (ppm) | 2.311 | 0.768 | 1.021 | 6.218 |