Drilling at the newly named Radar prospect intersected nickel-copper sulphide mineralisation between 44.2m and 51.7m downhole including intervals of massive nickel-copper sulphides.
Assays are awaited.
St George is delighted by the shallowness of the discovery and to have extended the strike of mineralisation along the Cathedrals Belt to an "impressive" 5.5km.
Downhole EM is being undertaken ahead of further drilling.
St George identified Radar as a target following regional EM, with multiple other targets still to see the drill rig.
St George said in July 42 new EM conductors had been prioritised and scheduled for drilling in the current quarter.
They include the Bullets prospect 1km from Radar.
The company started the September quarter with $3.3 million cash.
St George raised $4 million in June by issuing new shares priced at 11c each.
Shares in St George were up 18% to 16.5c in afternoon trade, capitalising the company at $61 million.
