| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.769 | 0.264 | 0.257 | 1.976 |
| Arsenic | As (ppm) | 2.582 | 1.554 | 0.937 | 13.979 |
| Calcium | Ca (wt%) | 0.060 | 0.120 | 0.003 | 0.991 |
| Copper | Cu (ppm) | 2.510 | 0.743 | 1.069 | 5.960 |
| Iron | Fe (wt%) | 0.588 | 0.265 | 0.184 | 2.171 |
| Mercury | Hg (ppm) | 0.013 | 0.004 | 0.010 | 0.033 |
| Magnesium | Mg (wt%) | 0.030 | 0.013 | 0.010 | 0.076 |
| Manganese | Mn (ppm) | 77.097 | 46.450 | 16.873 | 309.804 |
| Sodium | Na (wt%) | 0.013 | 0.010 | 0.003 | 0.066 |
| Phosphorus | P (wt%) | 0.009 | 0.004 | 0.003 | 0.041 |
| Lead | Pb (ppm) | 12.899 | 3.049 | 2.917 | 23.032 |
| Selenium | Se (ppm) | 0.148 | 0.050 | 0.100 | 0.392 |
| Titanium | Ti (wt%) | 0.315 | 0.073 | 0.077 | 0.470 |
| Zinc | Zn (ppm) | 11.710 | 4.530 | 2.600 | 39.037 |