THE DRILL SERGEANT: St George Mining (ASX: SGQ) released more results from ongoing exploration programs underway at the company’s Mt Alexander project in the north-eastern Goldfields of Western Australia.
St George is concentrating on shallow, high-grade nickel-copper sulphides it has discovered at the Cathedrals Belt to date, which it believes to be associated with mafic-ultramafic intrusions interpreted to have passed upwards from the Earth’s mantle through structures located in the northern margin of the Belt.
Deeper drilling to track the mineralised intrusive units down-plunge of the shallow deposits has intersected these units in their interpreted down-dip extension.
Subsequent downhole EM (DHEM) surveys the company has underway in these deeper holes have now identified multiple off-hole EM conductors, which St George consider to be excellent targets for the discovery of further nickel-copper sulphide mineralisation.
“These new EM targets from the deeper holes indicate that the large, high-grade mineral system at the Cathedrals Belt is ‘live’ at depth,” St George Mining executive chairman John Prineas said in the company’s announcement to the Australian Securities Exchange.
“With all EM conductors drilled in the Cathedrals Belt confirmed as nickel-copper sulphides, the new EM conductors present a tremendous opportunity to make further discoveries and to confirm the continuation of mineralisation down-plunge.
“We are seeing increasing potential for significant mineralisation at depth, and are excited to be escalating our drill program to more intensely test this priority target area.”
MAD168 is the latest deep stratigraphic hole St George has completed at the Cathedrals Belt.
The hole was drilled to a downhole depth of 301 metres where it intersected 6.5m of nickel-copper sulphides from 227.1m downhole.
The sulphides were intersected in the interpreted down-dip continuation of the Investigators ultramafic unit.
MAD168 is a large 95m step-out to the north of the previously known mineralisation in MAD123 that St George claims has confirmed a large extension of the down-plunge strike of high-grade mineralisation at Investigators.
The breccia and stringer sulphides intersected by MAD168 suggest remobilisation from a larger and proximal source of massive nickel-copper sulphides.
This interpretation is given additional weight by the high chalcopyrite content of the sulphides in MAD168, a further indicator of proximal remobilised mineralisation.