Tertiary Minerals — Initial results from Phase 4 drill programme

Early drill results show promise, but investment case remains unproven and highly speculative.

What the company is saying

Tertiary Minerals plc is positioning itself as a junior explorer making tangible progress at its Mushima North Project in Zambia, with the aim of attracting investor attention through technical milestones. The company highlights high pXRF silver values (up to 214 g/t) and broad mineralised intervals, framing these as evidence of a potentially significant silver-copper-zinc deposit. The narrative leans heavily on the aspirational Exploration Target of 15-30 million tonnes at 40-60 g/t silver equivalent, suggesting scale and upside, though this is not yet supported by a JORC-compliant resource. Management’s language is upbeat and forward-looking, repeatedly referencing the potential for a higher-grade copper zone and the ongoing nature of the drill programme. The announcement is structured to emphasise technical progress—specific drill intersections, metres drilled, and proximity to the historic Kalengwa mine—while omitting any discussion of costs, cash position, or economic viability. The company also stresses that samples have been submitted to a certified laboratory, with results expected soon, and that further updates will follow as drilling continues. There is no mention of off-take partners, funding status, or development timelines, which are critical for moving from exploration to production. Richard Belcher, the Managing Director, is the only notable individual identified, and his involvement is significant only insofar as he is the operational lead; there is no indication of participation by major institutional investors or strategic partners. Overall, the messaging is designed to keep the market engaged with a steady flow of technical updates, building anticipation for a future resource estimate and, ultimately, a potential re-rating.

What the data suggests

The disclosed data is strictly technical and preliminary, consisting of pXRF assay results from the first 12 drill holes and summary statistics for 22 holes (2,175m) out of a planned 4,000m programme. The headline numbers—such as silver values up to 214 g/t and copper intersections like 45m at 0.41% Cu—are notable for an early-stage project, but true widths are unknown and laboratory confirmation is pending. The company’s Exploration Target of 15-30 million tonnes at 40-60 g/t silver equivalent is stated, but there is no supporting resource calculation, grade distribution, or tonnage estimate based on current drilling. No financial data—costs, cash burn, or funding status—is provided, making it impossible to assess the company’s financial trajectory or sustainability. The technical disclosures are detailed in terms of drill intervals, grades, and spatial layout, but the absence of laboratory assays and a JORC Mineral Resource Estimate means that the scale and grade of the deposit remain speculative. There is no evidence that prior targets or milestones have been met, as no such benchmarks are disclosed. An independent analyst would conclude that while the technical progress is real, the investment case is not yet substantiated by resource definition or economic analysis. The data quality is high for exploration but incomplete for any financial or investment decision-making.

Analysis

The announcement is upbeat, highlighting promising pXRF assay results and significant drill intersections, but the actual progress is limited to preliminary exploration data. While specific drill results are disclosed, key claims such as the Exploration Target (15-30Mt at 40-60 g/t AgEq) are forward-looking and not yet substantiated by a JORC Mineral Resource Estimate or laboratory-confirmed assays. No financial, cost, or profitability metrics are provided, and the timeline for any economic benefit remains undefined. The narrative leans on the potential scale and grade of the target, but these are not yet realised facts. The gap between narrative and evidence is moderate: technical progress is real, but the investment case is not yet supported by resource or financial data. The absence of capital outlay or immediate earnings impact means capital intensity is not flagged, but the lack of profitability disclosure caps the signal at weak_positive.

Risk flags

• ●Resource risk: The Exploration Target of 15-30 million tonnes at 40-60 g/t silver equivalent is aspirational and not supported by a JORC Mineral Resource Estimate or laboratory-confirmed assays. This matters because investors have no reliable basis for valuing the asset or assessing its economic potential.
• ●Technical risk: All disclosed grades and intervals are based on preliminary pXRF data, not certified laboratory assays. If lab results diverge from pXRF readings, the perceived value of the project could drop sharply.
• ●Disclosure risk: The announcement omits all financial data—no costs, cash position, or funding status are provided. This leaves investors blind to the company’s ability to fund ongoing exploration or withstand setbacks.
• ●Execution risk: The company is only halfway through its planned 4,000m drill programme, and the mineralisation remains open in multiple directions. There is a significant risk that further drilling may not deliver the continuity or grades needed for a resource estimate.
• ●Timeline risk: All major value milestones—laboratory assays, resource estimate, economic studies—are in the future, with no specific dates or timelines disclosed. Investors face a long wait before any investment thesis can be validated.
• ●Speculative signal: The majority of claims are forward-looking, with little realised value to date. This pattern is typical of early-stage explorers and should be weighted accordingly in any investment decision.
• ●Geographic risk: The project is located in Zambia, which may present jurisdictional, regulatory, or logistical challenges not addressed in the announcement. Investors should be aware of country-specific risks that could impact project development.
• ●Management concentration: Richard Belcher is the only notable individual identified, and there is no evidence of institutional or strategic investor participation. While this keeps the story tightly controlled, it also means there is no external validation or financial backstop.

Bottom line

For investors, this announcement is a classic early-stage exploration update: it provides technical encouragement but no actionable investment signal. The company has drilled 22 of a planned 40 holes and reports promising pXRF results, but these are not yet confirmed by laboratory assays or translated into a JORC-compliant resource. The narrative is credible as far as technical progress goes, but the leap from drill results to economic value is entirely unproven. There are no institutional investors or strategic partners involved, and the only notable individual is the Managing Director, whose presence is expected but not a validation of the project’s investment case. To change this assessment, the company would need to deliver certified laboratory results, a JORC Mineral Resource Estimate, and at least basic financial disclosures on costs and funding. Key metrics to watch in the next period are the laboratory assay results, the number of metres drilled, and any progress toward a resource estimate. At this stage, the information is worth monitoring for those interested in high-risk, high-reward exploration stories, but it is not a basis for immediate investment. The single most important takeaway is that while technical progress is real, the investment case remains entirely speculative until resource and economic fundamentals are established.

Announcement summary

(AIM: TYM) Tertiary Minerals plc announced preliminary results from portable X-Ray Fluorescence (pXRF) analysis of drill samples from the first 12 drill holes at Target A1, Mushima North Project in Zambia. The company reported high pXRF silver values of up to 214 g/t and broad intervals (>20 g/t), with drill intersections including 45m at 0.41% Cu and 0.28% Zn from 12m downhole, 55m at 0.32% Cu and 0.29% Zn from 26m downhole, and 73m at 0.29% Cu and 0.38% Zn from 25m downhole. A total of 22 holes (for 2,175m) have been completed so far of the approximately 4,000m drill programme. The company has an Exploration Target of 15-30 million tonnes at 40-60 g/t silver equivalent for the silver-copper-zinc oxide zone. Samples have been submitted to a certified laboratory and results are expected in the coming weeks. The company projects that infill drilling will support the delineation of a JORC Mineral Resource Estimate and that further results will be announced on an ongoing basis as the drill programme continues.

Disagree with this article?