Drilling Strong EM Conductors In Western Australia
St George Mining Limited (ASX: SGQ) has reported ongoing positive exploration results at its flagship Mt Alexander Project, located in the north-eastern Goldfields of Western Australia, including the potential for a new discovery:
Hole MAD192 was completed to a downhole depth of 500m to test a plate modelled with conductivity of 49,000 Siemens – being the modelled plate for one of two very strong conductors identified from the DHEM survey in MAD184.
The new conductors are within the West End Prospect, which covers the underexplored western extension of the Cathedrals Belt. They are located more than 800m to the west of previously intersected massive sulphides on the Cathedrals Belt and are the deepest conductors ever identified in the Cathedrals Belt.
Executive Chairman, John Prineas, said the discovery of massive sulphides at this location would represent a new discovery that could extend the strike of mineralisation across the Cathedrals Belt to more than 6.3km.
He said MAD192 intersected a 30m thick mafic-ultramafic unit from 440.5m downhole. These types of intrusive rocks are known to host massive sulphide deposits in other parts of the Cathedrals Belt. The intrusive unit included a 6m interval of disseminated sulphides, which is a potential indicator of massive sulphides nearby.
However, MAD192 did not intersect any conductive material that could account for the 49,000 Siemens EM conductor, which is the deepest conductor detected so far along the Cathedrals Belt.
A DHEM survey will be completed in MAD192 to provide additional data from which the location and geometry of the powerful conductor can be reviewed, and a further target plate modelled for drill testing.
The data from the DHEM survey in MAD184, which was used to model the new conductors, is considered very good. The two strong EM anomalies recorded in the data are high quality conductors that are interpreted to represent bodies of bedrock-hosted massive sulphide mineralisation.
“Drilling continues to intersect the large intrusive mineral system at the Cathedrals Belt, which we know hosts abundant high-grade nickel-copper sulphides at other points along the strike of the Belt,” Mr Prineas said.
“The mineral system remains open to the west where we are currently drilling to test new and very strong conductors. Significantly, the system is also unconstrained at depth towards the north-northwest down-dip of the system.
“The results in MAD192 have not altered the interpretation of the presence in this area of very strong EM conductors with the characteristics of massive sulphides.
“We are confident that ongoing drilling has outstanding potential to deliver another significant discovery of massive nickel-copper sulphides.”
