A high-grade nickel-copper sulphide intersection encountered during drilling of the Stricklands target within St George Mining’s (ASX: SGQ) flagship Mt Alexander project in Western Australia has confirmed the prospect’s down-plunge continuation of mineralisation.
The 14 metre-thick zone was intersected from 78m downhole and encountered massive and semi-massive sulphides with average XRF (X-ray fluorescence) readings of 3.5% nickel and 1.2% copper.
St George said it was located just 100m from a previous “exceptional” intersection of thick, high-grade mineralisation from 37m downhole which returned assays of 17.45m at 3.01% nickel, 1.31% copper, 0.13% cobalt and 1.68 grams per tonne total platinum group elements (PGEs) from 37.45m.
That intersection also included the massive sulphide zone of 5.3m at 4.39% nickel, 1.45% copper, 0.21% cobalt and 2.09g/t total PGEs from 39.3m and significantly increases the strike mineralisation at Stricklands.
Drilling at Stricklands was completed to a depth of 166m and intersected nickel-copper sulphide mineralisation between 78m and 92m downhole including intervals of massive and semi-massive nickel-copper sulphides.
The prospect’s mineralised ultramafic unit has been interpreted to dip towards the north-west with potential for additional sulphide mineralisation at depth.
The latest results have confirmed the north-west continuation of these units containing high- grade nickel-copper sulphides.
The mineralisation remains open to the north-west and at depth.
St George will conduct a downhole electromagnetic survey (DHEM) to identify extensions of mineralisation around the hole and to plan follow-up drilling.
“The presence of thick ultramafic units at depth is very encouraging for the potential of further nickel-copper sulphide mineralisation in this area,” the company said.
“The down-plunge area is largely untested by drilling and we are increasingly confident that further discoveries of nickel-copper sulphides will be made in this area.”
DHEM surveys are a regular feature of St George’s exploration program and continue to light up strong drill targets at Mt Alexander, located 120 kilometres south of WA’s nickel-rich Agnew-Wiluna belt.
A survey conducted at the Radar prospect confirmed a strong in-hole electromagnetic anomaly consistent with the project’s massive sulphide mineralisation.
Modelling of the EM data is being finalised and follow-up drilling has been prioritised.
At the Investigators prospect, DHEM surveys carried out in recently-completed drill holes have confirmed strong off-hole EM anomalies untested by drilling.
The company said several of the new conductors are located more than 50m from known mineralisation, and represent large step-out targets “with the potential to significantly extend the footprint of mineralisation at Investigators”.
At midday, shares in St George Mining were up 9.52% to $0.230.