The detailed description of the pegmatites, which are coarse to...

The detailed description of the pegmatites, which are coarse to very coarse-grained and contain orthoclase-quartz with graphic textures, suggests advanced fractionation processes. Fractionation in geology refers to the separation of minerals as magma cools, which can lead to the concentration of certain elements, including lithium.Pegmatites are known to be a significant source of lithium, typically in the form of minerals like spodumene, lepidolite, petalite, or amblygonite. The mention of "graphic textures" is notable because these textures often indicate the presence of significant mineral crystallization from magma, a process that can form large crystals of commercially valuable minerals, including those that contain lithium.The mention of an "unconformity" between the TMG and the basal Tumbiana Formation of the Fortescue Group suggests a geological contact where different rock formations meet. This can be significant in mineral exploration because unconformities may serve as traps for mineral-rich fluids or as pathways for them to move through the rock, potentially leading to the formation of mineral deposits.Calcretised surfaces and boulders of pegmatite occurring within the basal Fortescue Group could indicate weathering processes that expose and concentrate mineral deposits, possibly including lithium-bearing minerals.The location described seems to be in a geologically complex and potentially mineral-rich area. Given the context, it would not be surprising if the area has been or is being explored for lithium deposits, especially since it contains pegmatites, which are prime targets for lithium exploration. The mention of specific localities such as south of Redmont and the Billy Creek area southwest of Redmont could point to known mineralized zones.