| Element | Symbol | Mean | Std. dev. | Minimum | Maximum |
|---|---|---|---|---|---|
| Aluminum | Al (wt%) | 5.879 | 0.487 | 4.809 | 7.402 |
| Arsenic | As (ppm) | 13.265 | 3.443 | 7.368 | 27.376 |
| Calcium | Ca (wt%) | 0.882 | 0.225 | 0.629 | 1.953 |
| Copper | Cu (ppm) | 15.738 | 2.425 | 10.452 | 24.063 |
| Iron | Fe (wt%) | 2.317 | 0.323 | 1.438 | 3.377 |
| Mercury | Hg (ppm) | 0.032 | 0.007 | 0.020 | 0.056 |
| Magnesium | Mg (wt%) | 0.712 | 0.155 | 0.406 | 1.492 |
| Manganese | Mn (ppm) | 463.923 | 100.995 | 228.348 | 737.635 |
| Sodium | Na (wt%) | 0.803 | 0.098 | 0.488 | 1.042 |
| Phosphorus | P (wt%) | 0.069 | 0.006 | 0.058 | 0.094 |
| Lead | Pb (ppm) | 21.383 | 3.308 | 15.608 | 34.642 |
| Selenium | Se (ppm) | 0.477 | 0.113 | 0.245 | 0.948 |
| Titanium | Ti (wt%) | 0.321 | 0.022 | 0.249 | 0.367 |
| Zinc | Zn (ppm) | 76.498 | 12.656 | 55.109 | 127.051 |