St George Mining (ASX: SGQ) has made another massive nickel-copper sulphide discovery at the high-grade Investigators prospect within its Mt Alexander nickel project, near Leonora in Western Australia’s goldfields region.
Sulphide mineralisation was intersected between 180.37 metres to 192.99m downhole, including massive sulphides from 184.42m to 190.915m, and again from 191.86m to 192.39m.
Drilling was completed to a downhole depth of 210m and aimed to test the south-west extension of high-grade mineralisation intersected in a previous hole which the company reported last week as its “best ever intercept” at Investigators.
Today’s announcement has surpassed assay results from that hole, with St George confirming it has delivered the thickest intercept of massive nickel-copper sulphides at Investigators to-date.
Major drilling program
The new strike was made during a major diamond drill hole campaign which has already confirmed that multiple intersections of high-grade nickel-copper sulphides extend the down plunge of mineralisation at Mt Alexander.
Drilling is currently focused along a 1.5km east-west strike of Investigators where the mineralised ultramafic unit is interpreted to dip to the north at an angle of 30 degrees, with potential for continuity of mineralisation at depth in a northerly down-dip direction.
Conductors extend mineralisation
Earlier this month, St George announced it had identified a series of strong off-hole conductors at Investigators, with modelled conductivity of 210,000 Siemens and trending in a westerly down-dip direction.
Such conductors can be a valuable way of indicating the potential for a significant extension to known mineralisation.
“Our downhole electromagnetic surveys are lighting up powerful conductors which are excellent targets for locating additional high-grade massive nickel-copper sulphide mineralisation,” executive chairman John Prineas said at the time.
“The clear and strong conductive responses [during the survey] … provide confidence to the interpretation that these responses are from a massive sulphide source.”
Today’s sulphide strike intersected a conductor situated approximately 5m to the south-west of the previous hole’s pierce point.
St George said the thicker massive sulphides encountered by the strike “confirm the repeatability of strong mineralisation in this conductor” and may suggest the mineralisation thickens towards the south-west.
A new hole is currently being drilled to target the same conductor, but this this time will be situated approximately 15m to the south-east of the pierce point.
Drilling at Mt Alexander continues to scope out the scale of the discovery and the company has said it will extend the campaign indefinitely in light of continued positive drill results.
The Mt Alexander project is located 120km south-southwest of the Agnew-Wiluna Belt, which is believed to host numerous world-class nickel deposits.
At midday trade, shares in St George Mining were trading 23.08% higher at $0.16.