Rome Resources (AIM:RMR), the AIM-listed critical minerals explorer focused on the Democratic Republic of Congo, said an updated mineral resource estimate for its Kalayi tin deposit shows a 45% increase in contained tin.
The inferred resource now stands at 0.46 million tonnes grading 1.47% tin, containing 6,760 tonnes of the metal at a 0.80% cut-off grade, prepared by The MSA Group in line with Canadian Institute of Mining, Metallurgy and Petroleum standards.
Compared with the maiden estimate published on 30 October 2025, tonnage rose 32% and average grade climbed 10%, from 1.33% to 1.47% tin, meaning the growth came without diluting ore quality.
MSA has also identified an area immediately southeast of the current resource, along the same high-grade trend, that could double the deposit again subject to further drilling.
The updated geological model now maps 11 mineralised zones, up from seven previously, with two further zones from an August technical update still too thinly drilled for inclusion.
Kalayi sits within the wider Bisie North project, which also hosts Mont Agoma, a separate polymetallic system with a maiden resource of 3.16 million tonnes grading 1.45% copper, 2.72% zinc and 14.3 g/t silver.
"Resource growth without grade dilution is unusual and reflects improving geological confidence," said Paul Barrett, chief executive of Rome Resources.
The company continues to hold discussions with potential strategic partners on developing Bisie North, and expects interpretation of airborne geophysics data across the licences to complete by the end of September.
News Intelligence what this means for the company
Rome Resources upgraded its Kalayi tin resource by 45% to 6,760 tonnes of contained metal, driven by both tonnage growth (up 32%) and grade improvement (up 10% to 1.47%), a combination the CEO noted is unusual. The company has also identified a southeast extension along the same high-grade trend that could double the deposit, with airborne geophysics interpretation expected by end-September to unlock further exploration upside across the wider Bisie North project.
The resource upgrade without grade dilution strengthens the case for Kalayi as a development asset and validates the geological model underpinning the wider Bisie North project, where the company is in discussions with strategic partners. However, as an early-stage explorer with no production revenue, Rome Resources remains dependent on partner funding and exploration success to advance toward development.
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