St George Mining (ASX: SGQ) has reported further encouraging lithium exploration results at its Mt Alexander project in Western Australia.
+120m thick pegmatite at Manta supports wider lithium potential:
- Assays for MAD213, which was drilled at the Manta Prospect on E29/638 (75% St George; 25% IGO) and intersected a wide zone with multiple pegmatites – including a continuous 120.8m interval – indicate local fractionation of the pegmatites that may represent the distal part of a zoned lithium-bearing system
- Major structures are interpreted to be associated with the thick flat-lying pegmatites hosted in granite, supporting the potential for the pegmatites to extend into a more favourable host in the greenstone belt, adjacent and intruded by the granite source
- The thick flat-lying pegmatite at Manta is modelled by seismic data as a strong, 1,000m diameter circular feature, with additional geophysics and drilling planned to test the wider potential for lithium bearing pegmatites around Manta
Extensive mineralised pegmatite field at Jailbreak, open along strike and at depth:
- Further assay resultsfrom the recent 2023 drilling programme at the Jailbreak Prospect confirm multiple lithium-bearing pegmatites with a peak value of 1.28% Li2O
- Lithium-bearing pegmatites now identified by drilling across a 2km strike of the pegmatite corridor with a further 13km-long part of the corridor that hosts an extensive network of mapped pegmatites yet to be tested by drilling
- Drilling at Jailbreak has intersected multiple pegmatites that have potential to become thicker at depth, similar to results reported by other explorers in the region
St George Mining executive chairman John Prineas said:
“Our understanding of the lithium prospectivity continues to grow at Mt Alexander with recent drill results confirming high-grade and anomalous lithium across a wide area.
“Most encouraging is the very thick 120.8m, flat-lying and locally fractionated zone of pegmatites intersected in hole MAD213 at the Manta Prospect, approximately 9km north of the Jailbreak Lithium Prospect.
“These types of pegmatites are what is required for large mineral deposits and we will continue to test for potential extensions of the Manta pegmatites within and below the adjacent greenstone belt.
“We have only just begun to realise the wider lithium potential at Mt Alexander with the latest drilling confirming the presence of major structures that can produce wide extensional openings for thick fractionated pegmatites to intrude.
“The results for MAD213 confirm that large-scale pegmatite intrusions have occurred and that they are showing signs of prospectivity for lithium. It is now down to identifying the more fractionated lithium-caesium-tantalum (LCT) zone within the pegmatite-hosted mineral system.
“We are also encouraged by recent excellent results announced by Delta Lithium at its nearby Mt Ida Project and the confirmation by Hancock Prospecting that it will proceed with a lithium exploration joint venture for Mt Bevan which has ground that wraps around our Mt Alexander tenure.”