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St George Mining encouraged by signs at Investigators as Mt Alexander diamond drilling progresses

The drilling program is showing encouraging signs with intrusive rocks intersected within the first hole, demonstrating similarities to the rocks seen around shallow-nickel-copper sulphide deposits along the Cathedrals Belt.

St George Mining Ltd - St George Mining progresses diamond drilling at Mt Alexander Nickel-Copper-Sulphide Project
DHEM surveys are being carried out at the holes recently drilled at the Fish Hook prospect

St George Mining Ltd’s (ASX:SGQ) is encouraged by promising signs returned from ongoing diamond drilling at the Investigators prospect of its flagship Mt Alexander Nickel-Copper Sulphide Project in Western Australia.

Hole MAD180 is the first of multiple deep holes being drilled to test large conductive features identified by magnetotelluric (MT) and audio-magnetotelluric (AMT) surveys completed across the Cathedrals Belt.

This hole, which was collared around 500 metres north of known mineralisation at Investigators and drilled towards the south, has so far intersected:

  • A mineralised ultramafic unit between 22.5 and 28.8 metres downhole, suggesting the potential presence of a second mineralised ultramafic belt to the north of and parallel to the main Cathedrals Belt;
  • Mostly granite from 29 to 524 metres downhole, as predicted by the MT survey data; and
  • Intrusive-style rocks intercalated within a structural zone from 524 to 795 metres, indicating the emergence of a large intrusive network at depth.

"Positive signs"

Intrusive rocks intersected are similar to the rocks seen around the shallow nickel-copper sulphide deposits along the Cathedrals Belt.

Drilling of MAD180 has paused due to poor ground conditions and the remedial plan is to wedge the hole at about 520 metres downhole and to re-start drilling towards the large conductive target at depth, which remains to be tested.

Executive chairman John Prineas said: “Notwithstanding our inability to complete the drilling of MAD180 as planned, the rocks intersected in the hole so far show positive signs for the potential in deeper areas of Investigators.

“This remains a compelling target and we look forward to getting MAD180 back on track to test the large conductive anomaly at Investigators."

Further exploration will be planned to investigate the extent of this parallel ultramafic unit and whether it has the potential to host significant nickel-copper sulphide mineralisation.

Second drill rig

A second diamond drill rig arrived at site earlier this week and started drilling MAD182 at the Cathedrals prospect.

This rig is operating on a single shift until the arrival of additional crew next week.

MAD182 is designed to be drilled to a depth of 700 metres to test a large conductive feature identified by the MT and AMT surveys.

The conductive target is northeast of the known Cathedrals nickel-copper sulphide deposit and may represent the down-plunge extension of that shallow mineralisation.

Prineas said: “We are pleased that drilling is also underway at the Cathedrals prospect following arrival of the second diamond rig.

"We are targeting another deep conductive feature that is ideally situated for the potential down-plunge extension of the shallow high-grade mineralisation.”

Drill hole details for diamond holes to test new targets.

DHEM surveys are being carried out at the holes recently drilled at the Fish Hook prospect and the DHEM crew will then move to Investigators to survey MAD179 and MAD180, once re-drilling is completed.


St George is managing its operations in compliance with COVID-19 regulations issued by State and Commonwealth authorities.

The company will continue to manage drilling and other field programs to protect the health safety of its team and service providers.

Quick facts: St George Mining Ltd

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Market: ASX
Market Cap: $67.98 m

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