Project Geology

Geology

Kundip is hosted in andesitic / dacitic rocks of the Annabelle Volcanics group, part of the Archaean Ravensthorpe Greenstone Belt. To the east, the volcanic rocks are thrust onto steep dipping, NNW striking Archaean sedimentary rocks and BIFs that form a prominent ridge – line called the Mt Chester range. To the west is the central Archaean tonalite, known as the Manyuptup Tonalite Complex. The tonalite has been interpreted to have crystallised from a magma chamber that was geochemically equivalent to the calc-alkaline lavas and pyroclastic rocks of the Annabelle Volcanics that formed the volcanic edifice to the vent. The Annabelle Volcanics that host the majority of the copper, gold and silver mineralisation within the Ravensthorpe area are typical of rocks associated with mass weathering of this emerging volcanic cone/edifice.

To the south, the Archaean aged greenstones are unconformably overlain by sediments of the later Proterozoic Basin known as the Mt Barren Group.

Kundip comprises numerous ore structures in three main groupings (Kaolin, Harbour View & Flag Groups) that have been the focus of varying levels of exploration and mining activity for over a century. Mineralisation is structurally controlled with generally narrow, 2-3m wide pyrite-pyrrhotite-chalcopyrite-quartz veins. Historical gold production totals 121,000t @ 18g/t Au for 68,000oz of gold from both underground and open pit sources.

Kaolin comprises a series of multiple, stacked gently dipping structures, with more significant lode structures, such as Western Gem, extending over 400m of strike. Harbour View is predominantly a steeply dipping structure which extends over 950m stretching between the Kaolin and Flag areas with a NE strike. Flag also has a single dominant structure which extends over 820m and dips steeply south.

Oxidation depth extends between 15m at Flag to over 50m at Kaolin. Mineralisation within the oxidised zone comprises readily leachable gold with generally low copper levels due to substantial leaching. Mineralogical investigations in fresh ore show that high grade gold occurs at the boundary of sulphide zones as sub-microscopic inclusions in sulphides and as gold or electrum in irregular lenses of quartz, sulphide-quartz within chlorite-carbonate shear zones and massive sulphide veins. Copper contents in the sulphide zone vary across the field, and can reach up to 7%.