Everyone wants to talk about lithium and cobalt. Almost nobody wants to talk about tin, which is strange, because you cannot solder a circuit board without it and the world is not finding much more of it. Tantalum is even further off the radar, despite sitting inside every smartphone and most aerospace electronics. Both metals are on critical minerals lists in Washington, Brussels, and Tokyo. Both are quietly having a very good decade. And both have a serious African story.
Why the supply picture favours small producers
Tin and tantalum are not iron ore. There are no giant open pits feeding the global market from three or four mega-mines. Supply comes from a long tail of small and mid-sized operations, which means a well-run producer at modest scale can be a meaningful player in a way that is simply impossible in bulk commodities. For investors, that changes the maths: a few million dollars of capital, deployed into the right permitted asset, buys relevance rather than a rounding error.
West Africa hosts some of the best cassiterite ground anywhere. Nigeria's Jos Plateau, a district that supplied the world's tin for most of a century, is a good example of the pattern we like: proven mineralisation, an existing mining culture, and modern operators returning with proper geology and processing discipline. The projects we have evaluated there carry something the lithium crowd would envy, polymetallic credits. A single wet-processing operation can produce cassiterite, tantalite, columbite, and ilmenite from the same ground, so one mine effectively sells into four markets.
The traceability premium is real money
Because tin and tantalum are designated conflict minerals, buyers in Asia, Europe, and North America require full chain-of-custody documentation. Plenty of producers treat this as a burden. The smart ones treat it as a moat. Material with clean traceability paperwork clears a premium and sells into a wider pool of buyers, while undocumented material fights for discounts at the margin. We have watched compliant producers win long-term offtake relationships on documentation quality as much as grade.
It is the same lesson we keep returning to across African minerals: the paperwork is not adjacent to the value, it is the value. A permitted mine with an approved environmental assessment, a JORC-aligned geological programme, and export traceability in place is a different asset class from an identical ore body without them.
What we look for
When we screen tin and tantalum opportunities, the checklist is short. A valid mining lease with environmental approvals already in hand, not promised. Grades supported by systematic sampling rather than a handful of spectacular assays. A processing plan matched to the ore, because recovery rates in the high nineties are achievable with the right wet-processing setup and ruinous without it. And a realistic capital number, because in this corner of the market, projects that need five million dollars and say so are more credible than projects that need fifty and whisper it.
The critical minerals story is broader than batteries. If you want exposure to the metals the electronics industry cannot function without, talk to us about where we see the entry points.