In Namibia’s historic Otavi Mountain Land, germanium is emerging as a strategic focus. Golden Deeps’ Graceland Prospect has reported channel-sample grades exceeding 200 g/t germanium within multi-element mineralisation, suggesting potential for a new source of this critical metal outside China. Whilst analogous deposits such as Tsumeb historically yielded germanium, modern exploration and the planned Tsumeb smelter upgrade position Otavi as a possible new frontier in the global search for technology minerals.
Globally, China dominates the germanium supply chain, controlling the majority of refining and export capacity. As demand rises for clean-energy, defence and telecommunications technologies, Western nations are seeking to diversify supply sources. Namibia’s emerging discoveries — together with the proposed redevelopment of the Tsumeb smelter — could give the country a modest but strategic foothold in this market.
Across southern Africa, few regions combine such long-standing base-metal heritage with current exploration momentum. While South Africa, Zambia and the Democratic Republic of the Congo lead in platinum-group metals, cobalt and copper, none have yet defined a dedicated germanium resource. Namibia, therefore, stands out for its established mining infrastructure, transparent regulation and easy access to export routes through Walvis Bay — advantages that support its ambition to supply niche metals to global markets.
The Otavi Mountain Land, spanning the triangle between Tsumeb, Otavi and Grootfontein, is the cradle of Namibia’s mining history. Early twentieth-century operations produced copper, lead, zinc and silver from carbonate-hosted deposits renowned for their mineral diversity. Chief among them was the Tsumeb Mine, which yielded more than 200 distinct mineral species and remains one of the world’s best-known examples of complex polymetallic mineralisation. Historical records indicate that between 1905 and 1996, Tsumeb produced significant volumes of copper, lead and zinc, and around 80 tonnes of germanium as a by-product.
More than a century later, explorers are once again turning to these same formations — this time armed with modern analytical techniques and driven by global demand for critical and strategic elements.
Australian-listed Golden Deeps Limited (ASX: GED) is currently leading this renewed exploration phase. At its Graceland Prospect, part of the Central Otavi Project, surface channel sampling at the Gossan 1 East zone returned assays of 201 g/t germanium, 42.7 per cent copper, and 176 g/t silver. The company interprets these results as evidence of a “Tsumeb-style” polymetallic system rich in copper, lead, zinc, silver and trace critical elements.
The mineralised corridor, extending roughly two kilometres by one kilometre, is being further investigated through geophysical surveys, with drilling planned to test deeper sulphide targets. Golden Deeps describes the area as “vastly under-explored for critical metals” and sees potential to delineate zones of continuity below the gossans.
Complementing these discoveries is the planned upgrade of the Tsumeb Smelter, now under Sinomine Resource Group. According to company statements and industry reports, the project aims to recover germanium, gallium and zinc from stored slag and future feed material, supported by an estimated US $223 million investment. The facility is expected to process around 200,000 tonnes of material per year once fully modernised.
If successful, the integration of exploration and refining could position Namibia as one of the few African countries with the capacity to produce and process strategic metals locally — a step towards value-addition in line with national industrial policy.
Germanium is a silvery-grey metalloid used in fibre-optic cables, infrared optics, semiconductors and solar panels. It rarely forms primary deposits, instead occurring as a trace element within zinc and copper ores. Economic recovery depends on both ore grade and processing technology.
The Otavi carbonate sequence is geologically favourable: it hosts numerous copper-zinc-lead sulphide occurrences that may contain elevated germanium. Deposits such as Khusib Springs, Nosib, and Abenab have recorded trace concentrations, though none yet qualify as commercial germanium resources. Modern geochemical work is helping identify zones where enrichment may be more consistent.
Despite encouraging surface results, Namibia’s germanium potential remains at an early stage. The high-grade samples from Graceland are preliminary and do not yet constitute an economic resource. Successful development will depend on follow-up drilling, metallurgical test work, and the viability of by-product recovery through facilities such as the upgraded Tsumeb smelter.
Nevertheless, exploration momentum is clear. Alongside Golden Deeps, companies such as Trigon Metals — redeveloping the nearby Kombat Mine — are also assessing polymetallic mineralisation that could yield valuable trace elements.
Germanium belongs to a class of metals whose value far exceeds their abundance. For Namibia, the Otavi district represents both a return to its mining roots and a move toward the minerals that underpin the green and digital economy.
Suppose ongoing exploration verifies the continuity of germanium-bearing zones and the Tsumeb upgrade proceeds as planned. In that case, the mountains that once powered Namibia’s early industrial story may again take centre stage — this time as a source of the metals that connect the modern world.
