Great Southern Copper plc announced results from the latest mapping and sampling programme at its Victoria prospect, Especularita. Early reconnaissance and follow-up prospect-scale exploration activities at Victoria prospect, Especularita, has discovered new high-grade Cu-Au-Ag mineralisation associated with mesothermal style, intrusive-related quartz-sulphide-carbonate vein breccias mapped over an area of 1,000 x 600m. Historical sampling by the Company has reported results up to 6.94% Cu, 1.85g/t Au and 84.8g/t Ag.

Victoria prospect mesothermal intrusion-related Cu+Au-Ag vein breccias: Prospect-scale geology mapping and sampling at Victoria has identified a network of ineralizati structures including quartz-sulphide matrix vein-breccias hosted in hornfelsed volcanics, and quartz-carbonate-sulphide matrix to carbonate matrix-supported vein-breccias hosted in granodiorite. Beneath the shallow gravel cover the geology of the prospect area is dominated by hornfelsed andesitic volcanic that is apparently fault-bound to the north against the Colorada advanced argillic lithocap. To the west and south the gravel overlaps the regionally extensive granodiorite intrusive.

Both the granodiorite and volcanics exhibit evidence of overprinting by anastomosing quartz-carbonate+sulphide-filled structures. The vein-breccia structures typically strike in a NNE-NE orientation over a distance of up to 400m and vary in outcrop width from 3 to 20m. Outcrop in the prospect area is obscured by shallow scree and colluvium which has the potential to bury additional mineralised structures - confirmed by several shallow artisanal pits and workings.

Copper ineralization typically occurs as coarsely disseminated chalcopyrite (with pyrite-specularite) hosted exclusively within quartz-dominant zones of the vein-breccia structures. Partial oxidation of the chalcopyrite to pitch limonite and other Cu oxides is evident in most locations. Leaching of copper from surface outcrops is also evident where strongly inerali boxwork textures are coincident with lower copper grades.

33 outcrop and 11 float samples of quartz-sulphide vein-breccias were collected during this survey period. In places late carbonate is observed to infill the open-space quartz-sulphide veins and overprint the silicification event resulting in re-brecciation and dilution of the silica-sulphide filled structures often resulting in massive carbonate veins and stockwork systems. These later carbonate-dominant structures are typically sulphide-poor. Character samples of the carbonate-dominant veins (24 outcrop and 3 float samples) were collected to establish the Cu-Au grade relationship between silica-sulphide dominant veins and carbonate veins within the overall Victoria system.

All of the carbonate-dominant vein structures sampled in this programme returned copper assay grades below 250ppm Cu. The copper+gold-silver ineralization at Victoria is consistent with mesothermal intrusive-related type mineralisation and is similar to the gold-copper rich vein breccia system which is currently being tested with scout RC drill holes at the Company's Teresita prospect, located approximately 7.5km to the south-southeast. Planning is now underway for the next phase of exploration at Victoria which is designed to identify targets for prospect-scale reconnaissance drilling planned for the first half of 2024.

Sampling and results: All rock chip and float samples collected are located using hand-held GPS units (WGS84 zone 19S datum, UTM coordinate system) and allocated a unique sample number using a ticket-book system. Samples are transported from the field and delivered by Company employees to ALS Laboratories in Santiago where they are prepared for analysis (weighed, dried, crushed and pulverised). A subsequent 200g split of each sample pulp is then forwarded to the ALS geochemical laboratory in Lima, Peru, where samples are assayed for gold (30g fire assay with ICP-AES finish, ALS code AU-ICP21) and analysed for 48 major, base and trace elements by ICP-MS following a four-acid digest (ALS code ME-MS61).

Assay results for the 44 outcrop and float samples of quartz-sulphide vein-breccia range up to 4.04% Cu, 4.57g/t Au and 26.7g/t Ag. Significantly, however, 91% of the outcrop samples and 73% of the float samples were anomalous in copper (>0.1% Cu). In addition, 36% of the quartz-sulphide outcrop and 27% of the float samples returned assay grades over 1% Cu.