Mt Alexander Project
The Mt Alexander Project is located 120km south-southwest of the Agnew-Wiluna belt which hosts numerous world class nickel deposits.
The Project comprises six granted exploration licences – E29/638, E29/548, E29/962, E29/954, E29/972 and E29/1041 – which are a contiguous package. An additional two exploration licences – E29/1093 and E29/1126 – are located to the south-east of the core tenement package.
The Cathedrals, Stricklands, Investigators and Radar nickel-copper-cobalt-PGE discoveries are located on E29/638, which is held in joint venture by St George (75%) and IGO Limited (25%). St George is the Manager of the Project, with IGO retaining a 25% non-contributing interest (in E29/638 only) until there is a decision to mine. The Jailbreak Lithium Prospect is on E29/268 and E29/962.
St George acquired 100% of E29/954 and its 75% interest in E29/638 from BHP Billiton Nickel West in October 2015 and January 2016 respectively.
BHP Billiton Nickel West made the first discovery of high grade nickel-copper sulphides at Mt Alexander with drill hole MAD12 which intersected 3.95m @ 5.05%Ni, 1.55%Cu, 0.11%Co and 4.44g/t total PGEs from 91.4m.
St George has continued this exploration success with further shallow high-grade discoveries at the Stricklands, Investigators and Radar prospects with the strike of mineralisation in the Cathdrals Belt now extended to more than 5.5km.
Preliminary metallurgical testwork confirmed that Mt Alexander will produce a high value saleable concentrate that will be sought after by smelters. Grades achieved in this test were 18% nickel and 32% copper plus high values for cobalt and PGEs that will provide valuable smelter credits. The PGEs included 9g/t Palladium and 1.2g/t Rhodium.
The location of the Project near the world class nickel sulphide mines in the Agnew-Wiluna belt provides St George with access to existing roads and infrastructure, as well as opportunities to utilise existing processing plants.
The lithium potential at Mt Alexander was recognised in 2022 following the significant discovery by Delta Lithium (ASX: DLI) at its Mt Ida Project – located 15km south of St George’s Mt Alexander tenure.
Delta Lithium has since proclaimed this area as a ‘lithium corridor of power’ stretching from Kathleen Valley (156Mt @ 1.4% Li2O and 130ppm Ta2O5 – owned by Liontown (ASX: LTR)) in the north to Mt Marion (71.3Mt @ 1.37% Li2O – owned by Mineral Resources (ASX: MR)/Ganfeng) in the south.
Adjacent to Mt Alexander, Hancock Prospecting Pty Ltd is in joint venture with Hawthorn Resources (ASX: HAW) and Legacy (ASX: LCY).
The lithium prospectivity at Mt Alexander and Mt Ida is interpreted to be associated with the large Copperfield Granite. St George’s tenure covers a 15km long LCT (lithium-ceasium-tantalum) pegmatite corridor adjacent to the Copperfield Granite.