Chilwa Minerals has expanded its Mpyupyu West heavy mineral sands discovery to over 17 km², surpassing the combined area of the Mpyupyu Dune and Flat deposits. This expanded target borders the recently doubled 109.6 Mt Mpyupyu resource, with drilling underway to test a potential physical merger.
- Mpyupyu West HMS target expands from ~5 km² to over 17 km²
- Mpyupyu Mineral Resource more than doubles to 109.6 Mt
- Drilling commenced with Sonic Rig 1 intersecting mineralised saprolite
- Mpyupyu West surrounds Nakombe REE/niobium target enabling infrastructure synergies
- Scoping study for HMS deposits expected in Q3 2026
Mpyupyu West Discovery Surpasses Expectations
Chilwa Minerals Limited (ASX:CHW) has significantly expanded its Mpyupyu West heavy mineral sands (HMS) discovery in southern Malawi, more than tripling the target area from an initial 5 km² to over 17 km². This enlarged footprint now exceeds the combined size of the nearby Mpyupyu Dune and Flat deposits, which themselves were recently upgraded to a 109.6 million tonne Mineral Resource; more than doubling the previous estimate. The discovery’s scale and proximity to established resources mark a major milestone for Chilwa’s critical minerals ambitions.
Strategic Location and Resource Growth Potential
The expanded Mpyupyu West target lies immediately west, south, and south-east of Mpyupyu Hill, trending towards the upgraded Mpyupyu Dune and Flat deposits. This adjacency raises the prospect that the two mineralised systems could physically merge, potentially creating a larger, contiguous resource. Such a development could leverage existing and planned infrastructure, reducing capital intensity and operational costs. Chilwa’s Managing Director, Cadell Buss, highlighted the strategic advantage of this proximity, noting that Mpyupyu West now envelops the Nakombe rare earth element (REE) and niobium target, which could benefit from shared infrastructure if mined sequentially.
Drilling and Sampling Progress
Reconnaissance hand panning sampling has nearly completed its program, with 179 of approximately 204 planned near-surface sample sites finished on a nominal 400 m by 200 m grid. These samples have consistently shown visible heavy mineralisation, predominantly ilmenite and zircon, indicating a robust mineral assemblage. Sonic Rig 1 has commenced drilling at Mpyupyu West, intersecting a mineralised, free-dig saprolite unit to about 11 metres beneath a thin sand cover. This saprolite-style mineralisation, similar to Sovereign Metals’ Kasiya project, offers the advantage of near-surface, soft ore that can be mined and processed with minimal blasting, supporting low-cost development.
Multi-Rig Operations and Development Pathway
Chilwa currently operates two sonic rigs, with Sonic Rig 2 wrapping up resource-definition drilling at the Bimbi Southwest prospect before joining Sonic Rig 1 at Mpyupyu West. The combined drilling efforts aim to delineate the extent of the Mpyupyu West mineralisation and test for physical continuity with the Mpyupyu Dune and Flat deposits. These efforts underpin a broader scoping study expected in the third quarter of 2026, which will integrate the upgraded Mpyupyu resource with other HMS deposits on the licence to assess development potential.
Implications for Chilwa’s Critical Minerals Portfolio
The Mpyupyu West expansion strengthens Chilwa’s position as a multi-commodity critical minerals company. Its contiguous licence now hosts heavy mineral sands alongside significant niobium and rare earth element targets, offering potential cost and timeline efficiencies through shared infrastructure. While no mining decision has been made, the enlarged Mpyupyu West discovery and upgraded Mpyupyu resource provide a compelling foundation for future development. The company’s methodical approach; combining reconnaissance sampling, sonic drilling, and resource upgrades; reflects a measured strategy to grow organically within a single licence area rich in critical minerals.
Bottom Line?
Chilwa’s tripling of the Mpyupyu West target and proximity to a doubled resource base set the stage for a potentially low-cost, integrated critical minerals operation, but confirmation from ongoing drilling and assay results will be pivotal.
Questions in the middle?
- Will sonic drilling confirm a physical link between Mpyupyu West and the existing Mpyupyu deposits?
- How will the proximity of HMS and niobium-REE targets influence Chilwa’s development sequencing and infrastructure planning?
- What insights will the upcoming scoping study provide on the economic viability and scale of combined operations?