Tertiary Minerals plc (LSE:TYM) has reported its highest-grade silver-copper intersection to date from Phase 4 drilling at the Discovery Zone of its Mushima North Project in Zambia.
One drill hole returned an intersection of 82 metres grading 107 grams per tonne (g/t) silver equivalent from near-surface and ended in mineralisation, indicating that the mineralised zone continues beyond the depth reached by the hole.
All four newly reported drill holes intersected shallow silver-copper-zinc mineralisation, with some intersections extending beyond the boundaries of the company’s existing exploration target.
The results indicate that mineralisation remains open at depth and extends beyond parts of the currently defined target area.
The Phase 4 drilling programme comprises 39 reverse circulation holes and is designed to improve geological understanding and establish greater confidence in mineral continuity at Target A1.
The company intends to use the drilling results to support the preparation of a future mineral resource estimate compliant with the JORC reporting code.
Tertiary has previously outlined an exploration target for the Discovery Zone of between 15 million and 30 million tonnes grading 40–60 g/t silver equivalent. This remains an exploration target rather than a defined mineral resource.
In addition to silver, copper and zinc, drilling has identified accessory metals including bismuth, antimony and cobalt.
The company said these elements could provide additional economic value if they can be recovered commercially alongside the principal metals. Their economic recoverability has not yet been established.
Mushima North is located approximately 28 kilometres east of the historic Kalengwa copper-silver mine in Zambia’s Iron-Oxide-Copper-Gold region.
Tertiary Minerals is an AIM-listed exploration company focused on silver, copper and zinc projects. Its current work at Mushima North is aimed at defining the extent and continuity of mineralisation ahead of a potential mineral resource estimate.
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