The geological setting at Allamber is conducive to the formation of graphite. Carbonaceous metasediments of the Masson Formation have been strongly affected by thermal contact metamorphism induced by the emplacement of the Cullen granite intrusion to the east.
Drilling by Thundelarra along this contact has intersected wide sections of graphitic schists at a number of locations. Selected drill hole intervals were analysed for Total Graphitic Carbon (TGC) to gain a preliminary assessment of the graphite grade potential.
A preliminary petrographic (microscope) analysis was undertaken on selected drill chips from two holes drilled at the Cliff South prospect. Visual estimates of the graphite content seen in the thin sections ranged between 8% and 15% with individual graphite flakes up to 0.2mm (200μm) in size. Note that the assayed TGC for these samples ranged from 7.1% to 10.1%.
Coarse grained graphite is generally >150μm (microns). Flake sizes <150μm are fine grained. Flake size below 70μm is termed microcrystalline or amorphous and commands lower prices. Thus the morphology of any graphite located is of paramount importance: finer flake sizes may mean that the material would be unlikely to be commercially viable.