| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 0.942 | 0.190 | 0.473 | 1.440 |
| Arsenic | As (ppm) | 1.746 | 0.371 | 1.006 | 4.359 |
| Calcium | Ca (wt%) | 0.059 | 0.041 | 0.023 | 0.316 |
| Copper | Cu (ppm) | 4.852 | 1.288 | 2.164 | 8.913 |
| Iron | Fe (wt%) | 0.488 | 0.148 | 0.238 | 1.094 |
| Mercury | Hg (ppm) | 0.010 | 0.001 | 0.010 | 0.013 |
| Magnesium | Mg (wt%) | 0.044 | 0.013 | 0.021 | 0.094 |
| Manganese | Mn (ppm) | 108.407 | 43.688 | 34.320 | 244.979 |
| Sodium | Na (wt%) | 0.049 | 0.023 | 0.013 | 0.137 |
| Phosphorus | P (wt%) | 0.007 | 0.004 | 0.003 | 0.028 |
| Lead | Pb (ppm) | 7.184 | 1.409 | 2.578 | 13.544 |
| Selenium | Se (ppm) | 0.136 | 0.045 | 0.100 | 0.295 |
| Titanium | Ti (wt%) | 0.178 | 0.028 | 0.121 | 0.291 |
| Zinc | Zn (ppm) | 9.464 | 2.486 | 3.550 | 14.991 |