High grade nickel-copper sulphides have been discovered over a 5.5km strike of the Cathedrals Belt
The Cathedrals Belt has a unique geological setting. It is an east-northeast trending belt that hosts mineralised ultramafics within granites.
When St George acquired the Mt Alexander Project from BHP Billiton, there had been only one discovery of nickel-copper sulphides in the Cathedrals Belt. This was at the Cathedrals Prospect with mineralisation inferred over a 400m strike. Drilling by St George in 2016 identified further high grade mineralisation at the Cathedrals Prospect, and discovered new deposits of nickel-copper sulphides at the Stricklands and Investigators Prospects. In 2019, St George also made a new discovery of massive nickel-copper sulphides at the Radar Prospect.
These new discoveries by St George increased the strike of recurrent mineralisation at the Cathedrals Belt to more than 5.5km.
Electromagnetic (EM) targeting for massive sulphides is very effective at the Cathedrals Belt, with all EM conductors drill tested having been confirmed as nickel-copper sulphide mineralisation.
The Cathedrals Belt remains underexplored with targets identified at the West End abd Fish Hook Prospects. A major drill programme is planned for 2020 to test a number of new EM conductors at these unexplored Prospects, with potential for a new greenfields discovery.
Drilling in 2020 will also continue to test the down-plunge extensions of the shallow deposits at the Cathedrals Belt, and will continue infill and extensional drilling at the known areas of mineralisation for resource definition.
The figure below is a plan view of the of the Cathedrals Belt (over TMI magnetics) showing key prospects.
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