Tertiary Minerals is advancing its Mushima North copper-silver project in Zambia toward a maiden mineral-resource estimate after its latest Phase 4 exploration programme continued to identify broad zones of copper mineralisation with associated silver potential.
Preliminary portable XRF results from Target A1 have returned encouraging wide intersections, including 66 metres grading 0.30% copper and 68 metres at 0.28% copper. Higher-grade intervals within the broader mineralised zones include approximately 7 metres at 0.52% Cu and 5 metres at 0.57% Cu. The project also carries a preliminary Exploration Target of 15 million to 30 million tonnes grading between 40 and 60 grams per tonne silver, giving Mushima North a potentially attractive polymetallic profile.
Broad Copper Mineralisation Supports Resource Ambitions
Copper is expected to remain the project’s primary strategic focus, particularly because Mushima North is located in Zambia, one of Africa’s most important copper-producing countries and part of the globally significant Copperbelt. The silver component could provide an additional source of value if further exploration confirms that elevated grades are sufficiently continuous and recoverable.
Tertiary is now preparing to move from exploration targeting toward resource modelling and metallurgical studies, with a maiden mineral-resource estimate targeted for 2026. This represents an important stage in the development of any exploration project. Before a formal resource is established, companies are largely valued on geological potential and exploration success. A maiden resource provides investors with a more structured basis for evaluating the project’s tonnes, grades, mineralisation geometry and potential development scale.
Laboratory Assays Remain Crucial
The latest copper results are currently based on preliminary portable XRF measurements, meaning they still require confirmation through certified laboratory assays. Portable XRF technology is widely used during exploration because it allows companies to obtain rapid indications of elemental concentrations and identify areas of potential mineralisation. However, pXRF readings are not a replacement for accredited laboratory analysis and final assay results can differ from preliminary field measurements.
For investors, the key issue at this stage is therefore not simply the reported grades but whether the drilling demonstrates width, continuity and consistency of copper mineralisation. Broad, moderate-grade copper systems can potentially support substantial operations when favourable geology is combined with strong recoveries, efficient mining conditions and access to infrastructure.
Zambia Provides a Strong Copper Investment Setting
Mushima North also benefits from its location within Zambia’s established copper-mining ecosystem. The country has decades of experience in copper production, established mining infrastructure and a government strategy focused on significantly increasing national copper output. International mining companies have been expanding their presence in Zambia, strengthening the country’s position as an increasingly important destination for global copper investment.
For smaller developers, that existing industrial ecosystem can offer potential advantages through access to mining contractors, technical expertise, processing facilities and established transport networks. Nevertheless, project scale will remain critical. The current 15–30 million-tonne Exploration Target is far smaller than Zambia’s major Copperbelt operations, but a resource of meaningful size could potentially support a smaller standalone development or attract interest from an established producer seeking additional feedstock or exploration upside.
Metallurgy Could Define the Project’s Economic Potential
One of the next major technical questions will be metallurgy. The eventual economic value of Mushima North will depend on factors including copper and silver recoveries, mineralogy, concentrate quality and processing requirements. A deposit can demonstrate attractive grades and extensive mineralisation yet still face economic challenges if the metals are difficult or expensive to recover. Early metallurgical testing can therefore become a major valuation catalyst by establishing how efficiently the contained copper and silver can be converted into saleable products.
Infrastructure will also play an important role as the project advances. Access to reliable power, roads, transport networks and nearby processing capacity could significantly influence development costs and the amount of capital required to build a potential mine. These considerations are likely to become increasingly important once Tertiary has established its maiden resource.
From Exploration Target to Defined Resource
The immediate objective for Tertiary Minerals is clear: convert the encouraging exploration results at Mushima North into a credible and independently supportable mineral-resource model. If laboratory assays confirm the preliminary pXRF results and further modelling demonstrates continuity across the mineralised zones, Mushima North could make an important transition from an early-stage exploration target to a more advanced Zambian copper-silver development project. Such a shift would materially strengthen the investment case and give investors a clearer framework for assessing the project’s potential scale, economics and future development options.
