Tertiary Minerals (LSE:TYM) reported 121 metres grading 78 grammes per tonne silver equivalent from just 4 metres downhole at the Discovery Zone, part of Target A1 at its Mushima North project in Zambia, the best silver-copper intersection recorded on the project to date.
The AIM-listed explorer holds Mushima North through its 90%-owned subsidiary Copernicus Minerals, with local partner Mwashia Resources holding the remainder, in a region 28km east of the historic Kalengwa copper-silver mine, currently under redevelopment.
The results come from 13 further Reverse Circulation holes drilled as part of a 39-hole, 3,639-metre Phase 4 programme, all of which intersected near-surface silver-copper-zinc mineralisation.
Several holes ended in mineralisation, extending the deposit's known depth, including the top result, which contained a higher-grade section of 10 metres at 165 grammes per tonne silver equivalent from 80 metres downhole.
A separate hole returned the highest single silver assay recorded on the project, at 471 grammes per tonne.
"We are thrilled to report our best silver-copper mineralised intersection to date on the Project, a further 24m longer than the previous Project record", said managing director Richard Belcher.
The company has previously outlined a JORC-compliant Exploration Target at the Discovery Zone of 15 to 30 million tonnes at 40 to 60 grammes per tonne silver equivalent, and 25 of the 39 Phase 4 holes have now been reported.
Additional laboratory results from the remaining holes are expected imminently.
News Intelligence what this means for the company
Tertiary Minerals reported its strongest silver-copper intercept to date at Mushima North in Zambia: 121 metres grading 78 g/t silver equivalent from just 4 metres below surface, with a higher-grade 10-metre section at 165 g/t silver equivalent. This extends the deposit's known depth and represents material progress toward resource definition; 25 of 39 Phase 4 holes have now reported results, all intersecting near-surface mineralisation within the previously outlined exploration target of 15–30 million tonnes at 40–60 g/t silver equivalent.
The intercept validates the exploration target's scale and confirms near-surface, high-grade mineralisation amenable to shallow mining. Remaining Phase 4 assays are pending; resource conversion and economic viability remain contingent on metallurgical work and scoping study outcomes.
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