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Prospect Resources Limited (ASX:PSC) has revealed substantial high-grade copper intersections that expand the Nyungu Central deposit at its Mumbezhi Copper Project in north-west Zambia. Step-out drilling results include 44.0 metres at 0.60% copper and 17.0 metres at 0.57% copper, located beyond the current mineral resource estimate and remaining open towards the southeast. These findings validate the company’s exploration targeting approach and highlight the considerable growth potential of this large-scale copper system.
Key Highlights
- Prospect Resources Limited (ASX:PSC) holds a 90% stake in the Mumbezhi Copper Project, north-west Zambia.
- Phase 3 diamond drilling at Nyungu Central yielded 44.0m @ 0.60% Cu and 17.0m @ 0.57% Cu, both outside the existing mineral resource boundary to the southeast.
- Thirteen Phase 3 diamond drill holes completed totaling 4,043 metres; assays pending for six additional holes with visually confirmed copper sulphides.
- A 6,000-metre infill diamond drilling campaign at Nyungu Central is scheduled to start in late July 2026, while a second rig focuses on exploration at Nyungu West.
- Current mineral resource at Nyungu Central stands at 154.4 million tonnes at 0.42% copper (0.51% CuEq) using a 0.2% Cu cut-off grade as of May 2026.
Nyungu Central Copper Mineralisation Expands Beyond Current Resource Limits
Prospect Resources has successfully extended high-grade copper mineralisation at the southern edge of the Nyungu Central deposit through step-out drilling. Key intersections include drill hole NCDD026, which intercepted 44.0 metres at 0.60% copper from 270 metres depth, and hole NCDD024, with 17.0 metres at 0.57% copper from 186.4 metres depth. Both lie southeast of the existing mineral resource boundary, confirming ongoing expansion of the copper system in that direction.
These new intercepts are outside the Indicated and Inferred mineral resource estimate of 154.4 million tonnes at 0.42% copper (0.51% copper equivalent) reported in May 2026 at a 0.2% copper cut-off. Their relatively shallow, up-plunge location compared to defined mineralisation suggests potential for enhanced economic viability. The mineralisation remains open to the southeast, with further drilling planned as Phase 3 progresses and pending assay results are received.
Phase 3 Drilling Yields Broad, High-Grade Copper Zones
The ongoing Phase 3 diamond drilling campaign targets high-growth zones at the south-eastern and south-western extremities of the Nyungu Central resource, where chalcopyrite and chalcocite mineralisation approaches the surface before being truncated or offset by an east-southeast trending fault. To date, thirteen holes totaling 4,043 metres have been drilled in this southern area. Priority assay results for several holes have been received, while six remain pending.
New high-grade intersections correspond with a strong, shallow airborne electromagnetic anomaly, reinforcing the reliability of the company’s exploration targeting model at Nyungu Central. Pending assays include five holes from the southeastern growth area and one hole (NCDD025) from the southwestern zone, all containing visually logged copper sulphides. These results will further clarify mineralisation extent and grade distribution in these prospective areas.
Open-Ended Copper Mineralisation Supports Further Drilling and Resource Expansion
Geological interpretation indicates copper mineralisation south of 8629750mN extends southeast and remains open, presenting opportunities for continued exploration to delineate the system at depth and along strike. The company’s long section projection highlights a potential new mineralised zone adjacent to the wide NCDD026 intersection, which remains open up-plunge to the south, suggesting multiple drilling targets for resource expansion.
In addition to growth drilling, a 6,000-metre infill diamond drilling programme at Nyungu Central is set to commence in late July 2026. This will enhance resource confidence and potentially increase the mineral resource estimate by testing areas within and near the existing resource boundary at higher drill density. This combined approach of step-out and infill drilling underscores a systematic resource development strategy.
Operational Growth at Mumbezhi Project and Nyungu Hub
Prospect Resources currently operates one diamond drill rig at the southern Nyungu Central deposit targeting shallow copper mineralisation outside the existing resource. A second rig has been deployed to explore the Nyungu West prospect zone, enabling simultaneous resource definition and early-stage exploration within the Nyungu Hub area.
Managing Director and CEO Sam Hosack noted the company’s strategic shift towards broader Nyungu Hub targets, including initial exploration at Nyungu West and targeting a large geophysical conductor northeast of Nyungu South. Plans also include exploratory drilling at the Kamafamba prospect and the large-scale Chipimpa IP/EM/geochemistry target later this quarter. Assay results from recent drilling at the Sharamba coincident anomaly remain pending. This expanded exploration programme reflects confidence in the district-scale potential of the Mumbezhi Project.
Mumbezhi Copper Project Ownership and Strategic Importance
Prospect Resources holds a 90% interest in the Mumbezhi Copper Project in north-west Zambia, which includes the Nyungu Central deposit—one of the largest copper resources in the region—and multiple exploration prospects at various stages. The company’s model integrates systematic in-fill and resource definition drilling at advanced prospects with early-stage exploration across greenfield targets within the project area.
Located in Zambia’s prolific copper belt, the project benefits from established mining infrastructure and regulatory frameworks. Operating multiple diamond rigs concurrently across different prospects demonstrates the company’s operational capability and commitment to unlocking value across its portfolio. The combination of a large defined resource at Nyungu Central and multiple early-stage targets offers a diversified approach to growth.
Exploration Targeting Model Validated by Recent Results
Managing Director Sam Hosack highlighted that recent step-out drilling success and the correlation between shallow airborne electromagnetic anomalies and high-grade copper intersections confirm the effectiveness of the company’s exploration targeting model at Nyungu Central. This validation supports applying similar geophysical and geological targeting methods across other prospects within the Mumbezhi Project to identify additional mineralised zones.
Chief Geologist Roger Tyler, a qualified Competent Person under the Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (2012 Edition), compiled the exploration data. His expertise adds credibility to the findings and supports the company’s broader exploration strategy.
Improved Economics and Scale Potential for Nyungu Central
The managing director emphasized that the wide, high-grade, and relatively shallow intersections outside the current resource boundary may enhance the economic parameters of future mining operations. These results, beyond the existing 154.4 million tonne resource, indicate potential for resource growth and improved project economics.
Management considers these developments exciting and aligned with the company’s Mumbezhi Project development strategy. Pending assay results from six holes containing visually logged copper sulphides will be crucial to confirming the extent of these economic attributes and guiding further resource expansion.
District-Scale Exploration Pipeline and Multiple Targets
Beyond Nyungu Central, the Mumbezhi Project includes several exploration targets at various stages. The Nyungu West prospect is now a focus with the second diamond rig deployed. Additional targets include a large geophysical conductor northeast of Nyungu South, the Kamafamba prospect, and the large-scale Chipimpa IP/EM/geochemistry target, all slated for initial drilling later this quarter. Assay results from recent drilling at the Sharamba coincident anomaly are awaited.
This diversified portfolio reflects management’s view of the Mumbezhi Project as a district-scale opportunity with multiple copper discovery prospects rather than a single asset. Consistent targeting methodologies validated at Nyungu Central are being applied across the project to identify further mineralised systems. Exploration progress and drilling prioritisation will continue to drive newsflow and investor interest.
Pending Assays and Upcoming Catalysts for Share Price Movement
As of the company update, assay results are pending for six Phase 3 diamond holes at Nyungu Central, including five in the southeastern growth area and one in the southwestern zone, all with visually logged copper sulphides. These results represent near-term catalysts that could confirm high-grade mineralisation extensions or provide insights into mineral distribution in growth zones.
Additionally, assay results from exploratory drilling at the Sharamba coincident anomaly remain outstanding. While the company has not disclosed exact timing for these releases, sequential assay announcements from multiple drilling programmes may generate ongoing newsflow and potential share price movement. The immediate market impact remains uncertain based on available information.
