Shares of Tertiary Minerals plc (TYM.L) ticked up 7.69% to £0.07 on August 11 after the company reported encouraging preliminary results from its 3,639-metre, 39-hole drilling programme at Mushima North in Zambia. For a company valued in the single-digit pence, even modest exploration news can move the needle — but investors should weigh excitement against the long road from drill core to cash flow. Tertiary Minerals Strikes Copper at Record Prices — but Is a £3.5 Million Company Ready to Cash In on a Zambian Discovery?

Shares of Tertiary Minerals plc (TYM.L) jumped 7.69% to £0.07 after the AIM-listed explorer completed its largest-ever drilling campaign at the Mushima North project in Zambia. The 39-hole, 3,639-metre Phase 4 programme represents another step toward defining near-surface polymetallic mineralisation.

Managing director Richard Belcher said drilling "continued to support the extent of mineralisation while strengthening evidence for the higher-grade silver and copper zone." For a company with a market capitalisation of roughly £3.5 million and just four employees, even a modest drill hit can feel seismic — but certified lab results have yet to arrive.

  • The Drill Hits Look Decent, but the Numbers Aren't Final. Preliminary readings using portable X-ray devices support the previously identified silver-copper-zinc target. Earlier Phase 4 results in July included 45 metres at 0.41% copper and 0.28% zinc, including 6 metres grading 1.01% copper. The latest update flags 15 metres at 0.53% copper. These are hand-held scanner readings, not certified assays — the company itself cautioned that silver readings are semi-quantitative and that true widths are currently unknown. Investors are pricing in hope before the hard data.

  • Copper's Record Run Makes Even Small Deposits Interesting. Copper hit an all-time COMEX high of US$6.77 per pound on August 7, 2026.

Demand continues to be driven by electrification and AI data-centre expansion. That macro backdrop inflates the theoretical value of any new copper find and explains why a 7.69% pop can occur on preliminary data.

  • A JORC Resource Estimate Is the Real Prize — and the Real Test. The company is targeting a formal JORC Mineral Resource Estimate before the end of 2026, which would convert what is currently an exploration target of 15–30 million tonnes at 40–60 g/t silver equivalent into a bankable number. Until then, there is no proven resource, no mine plan, and no revenue — only geological promise.

  • The KoBold Partnership Provides a Financial Safety Net. Separately, AI-driven explorer KoBold Metals, backed by Bill Gates and Jeff Bezos, is spending up to US$6 million in Stage 2 exploration at Tertiary's nearby Konkola West copper project.

This joint-venture model reduces Tertiary's capital risk while preserving its upside. It also lends credibility: a Silicon Valley heavyweight continuing to invest signals the Zambian Copperbelt geology has real potential.

Bottom line: The drilling news is incrementally positive, and record copper prices amplify the narrative. But with lab assays still pending and no defined resource, the 7.69% move is a bet on future confirmation — not present value.