Verde’s Potash bearing rock is distributed over an area approximately 100km x 6km at 20m to 80m thick. The rock is a green slate, formed by metamorphism of sedimentary rocks composed of quartz, feldspar, muscovite, and microcline. Verde’s potash rock is a lithological unit within the “Bambui Group” of the “Serra da Saudade” formation; neoproterozoic in age. The predominant potash minerals are muscovite and microcline.
| Chemical Composition (%)
|
| K2O |
5.5 - 12.0 |
| SiO2 |
56.0 – 68.0 |
| Al2O3 |
13.0 – 18.5 |
| Fe2O3 |
5.0 - 7.0 |
| MgO |
2.0 – 3.5 |
| MnO |
0.01 – 0.10 |
| P2O5 |
0.05 – 0.15 |
Source: Surface Samples