Tertiary Minerals PLC (AIM:TYM, OTC:TTIRF) shares leapt 66% higher on Wednesday, after revealing the highest-grade silver and copper intersection to date from its Target A1, at the Mushima North project in Zambia.
"We are thrilled to report not only our best intersection of silver mineralisation so far on this project, but also higher-grade copper mineralisation," said managing director Richard Belcher.
"Significantly, the high copper and silver values are from the northern most drill line, so the mineralisation remains open to the north and at depth."
The explorer said the latest drill hole returned 58 metres at 72 grams per tonne silver equivalent. Within the broader interval, high-grade results include 9 metres at 185 grams per tonne silver equivalent and 2.40% copper equivalent from 57 metres depth.
The mineralisation footprint now spans approximately 450 by 400 metres and remains open in multiple directions and at depth.
Belcher added: "The mineralisation footprint is now approximately 450m by 400m within a northwest-southeast orientation and remains open to the north/northwest, south/southeast and at depth.
"These results further support our bulk tonnage, open pit silver exploration model as well as the additional potential for copper and adds further credence to the significance of this discovery for the company."
In London, Tertiary shares were up 69% changing hands at 0.071p.