Pahtavaara – Geology & Exploration
Pahtavaara is hosted by ultramafic rocks (described as komatiites to high magnesian basalts). Gold mineralisation is structurally controlled and associated with: low sulphidation; quartz-carbonate polyphase veining resulting in a complex vein overprinting history with multiple deformation stages varying from brittle to ductile and back to brittle; intense alteration related to both prograde and retrograde metamorphism.
Pahtavaara’s complex alteration sequence exhibits multiple phases of overprinting, governed by changes in fluid chemistry and their reaction with host rocks with differing mineralogy. Unusual aspects of Pahtavaara include: Ni-Cu-Co geochemical ‘signature’ – most probably due to the ultramafic host rocks and massive sulphide lenses formed during prograde metamorphic and ductile conditions.
Gold mineralisation is identified in two phases: early fine grained and a later, more coarse grained phase. Both are ‘free’ gold and the deposit exhibits predominantly non-refractory metallurgical characteristics.
Gold at Pahtavaara was previously mined from two main zones Samurai and DB with the Karoliina and Lansi zones discovered towards the end of the last period of ownership in 2013. Recent work by Rupert has generated three new targets at Harpoon, NFE and T-Zone.
Potential to increase yield above historical 1000 Oz/VM
New drilling and reinterpretation expanding mineralised zones
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