Tertiary Minerals Completes Phase 4 Drilling at Zambia’s Mushima North Copper Project

Tertiary Minerals Plc has completed its Phase 4 drilling programme at Target A1 within the Mushima North Project in Zambia, with early portable X-Ray Fluorescence (pXRF) results identifying further copper mineralisation and supporting previously identified higher-grade zones.​

The Phase 4 programme comprised 3,639 m of drilling across 39 holes. Early results included an intersection of 15 m grading 0.53% copper from 100 m depth, including 7 m at 0.77% copper. Additional intersections included 4 m at 0.68% copper and 8 m at 0.62% copper, while broader infill intersections returned 65 m at 0.23% copperand 83 m at 0.16% copper.​

Mushima North is a polymetallic silver-copper-zinc prospect located within Zambia’s prospective Iron-Oxide-Copper-Gold region, approximately 28 km east of the historic Kalengwa copper-silver mine. The latest drilling supports the previously identified near-surface Exploration Target of 15–30 million tonnes grading 40–60 g/t silver equivalent, while also providing further indications of higher-grade copper and silver mineralisation within the target area.​

Samples from the drilling programme have been submitted for independent laboratory testing, with certified results expected to be released as they become available. Remaining pXRF results from the final nine holes are also expected, covering additional infill drilling at Target A1 and exploration of mineralisation west of Target A1 and at Target A2.​

With Phase 4 drilling now complete, the project is moving into its next stage of technical evaluation. Initial metallurgical testwork is expected to commence shortly, followed by data compilation and resource modelling. Tertiary Minerals is targeting the delivery of a JORC-compliant Mineral Resource Estimate for Mushima North before the end of 2026, which would provide a clearer assessment of the scale and grade distribution of the mineralised system following the latest drilling campaign.