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St George Mining encouraged by exploration successes at Mt Alexander Nickel-Copper Sulphide Project

Last updated: 15:12 07 Apr 2021 AEST, First published: 14:50 07 Apr 2021 AEST

St George Mining Ltd - St George Mining progresses exploration at Mt Alexander nickel-copper sulphide project
A DHEM survey of MAD197 is scheduled next week and an RC rig is expected at site in late April/early May.

St George Mining Ltd (ASX:SGQ) (FRA:S0G) continues to be encouraged by ongoing exploration at the flagship high-grade Mt Alexander Nickel-Copper Sulphide Project in the north-eastern Goldfields of Western Australia, including diamond drilling.

While the drilling continues, downhole EM (DHEM) surveys in MAD195 and MAD196 have identified new-off-hole electromagnetic (EM) conductors.

Three strong EM conductors were identified from MAD195 with modelled conductivity of 19,320 Siemens, 22,950 Siemens and 16,850 Siemens, respectively and three strong EM conductors were identified from MAD196 with modelled conductivity of 69,926 Siemens, 27,000 Siemens and 32,235 Siemens, respectively.

As of yesterday, drilling of MAD199 is at 64.2 metres downhole, with two crews are on-site, allowing for drilling 24/7 targeting the strong 19,320 Siemens conductor at 350 metres downhole depth.

“Potential for further mineralisation” 

St George executive chairman John Prineas said: “The science continues to support the potential for further significant mineralisation to be present in the large intrusive mineral system at the Cathedrals Belt.

“The recent petrographic analysis indicated that the nickel-copper sulphides in the Cathedrals Belt are likely to have been associated with a large igneous event and the product of multiple magma pulses – factors that support the potential for a large mineral deposit in the Cathedrals Belt and elsewhere in the wider project area. 

“It is very pleasing to therefore see the latest downhole EM survey data at Investigators and West End identify larger and more powerful EM plates than previous analysis had recognised. 

“Some of the new EM plates are located down-dip of known mineralisation at a depth that ground-based EM surveys are unlikely to have screened effectively. 

“With very little drilling in this area, the new EM conductors are excellent targets for the potential discovery of nickel-copper sulphides at depth.” 

Favourable intrusive host rocks

Drill hole MAD197 was completed in an unexplored area of the West End Prospect and intersected a thick 18.7-metre intrusive unit from 493.9 metres downhole, confirming the western extension of the intrusive unit of the Cathedral Belt a further 200 metres to the west.

Prineas said: “The deep exploratory hole drilled at West End has intersected intrusive style rocks on the same horizon and setting as the intrusive unit identified by drilling along other sections of the Cathedrals Belt. 

“This latest hole was completed 200 metres to the west of previous drilling at West End. 

“The result has extended the strike of the intrusive unit to more than 6.5 kilometres and confirmed the western flank of West End – as the Cathedrals Belt approaches the Ida Fault – as a prospective area for nickel-copper sulphide mineralisation. 

“Our fieldwork continues in full-swing and we look forward to reporting more exploration results as we continue to scope out the full high-grade mineral potential at Mt Alexander.“ 

A DHEM survey of MAD197 is scheduled for next week to search for conductive material around the hole that may represent massive nickel-copper sulphides and an RC rig is expected at site in late April/early May 2021. 

Plan view of recently completed drill holes MAD195 and MAD196 showing drill traces and DHEM plates.

Strong magnetic anomalies identified

A new airborne magnetic survey has identified a series of strong linear magnetic features on E29/1041 that may represent an intrusive unit similar to that present in the nickel-copper sulphide bearing Cathedrals Belt.

A discrete magnetic anomaly identified on E29/972 may represent an intrusive body similar to the intrusive rocks that host nickel-copper sulphides elsewhere in the Mt Alexander project area. 

Prineas said: “We are also excited by the results of the new magnetic survey conducted over two of our 100%-owned tenements E29/972 and E29/1041. 

“The strong features identified are similar to the magnetic signature of the highly mineralised Cathedrals Belt, giving encouragement that these new targets have potential to represent intrusive rocks with mineralisation.

“These targets will be drilled as soon as practicable.” 

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