Could Africa End Up Mining the Same Resource Twice?

Africa’s mining industry is looking at an old problem in a new way: the waste left behind by previous mining operations is becoming a source of recoverable minerals.

Tailings dams, waste dumps and discarded processing material across the continent still contain metals that earlier technologies could not recover economically. Better processing, mineral sorting, bioleaching and data-driven exploration are giving mining companies new ways to revisit these deposits.

The opportunity is particularly visible in Southern Africa, where decades of copper, gold and platinum production have created large volumes of mine waste. In Zambia’s Copperbelt, historic waste dumps contain copper and cobalt that have gained greater economic importance as demand for the two metals grows. But there is a bigger issue sitting underneath this opportunity.

Mining resources are finite. Mining technology is not.

A mineral deposit considered fully exploited today may look very different to a company using a new recovery technology ten years from now.

That creates the mining paradox: the more efficiently the industry extracts minerals today, the less remains for future operators. But the material today's technology cannot economically recover could become tomorrow's resource.

And some of that future technology may come from African mining startups developing new ways to process, separate and recover minerals.

So what happens to the material they may eventually be able to recover?

The Meaning of “Maximum Recovery” Is Changing

Mining companies have a commercial reason to recover as much as possible from an orebody today. The economics are built around the grade, commodity price, processing costs and technology available at the time.

But “maximum recovery” is not necessarily a permanent number. A processing method that achieves 90% recovery today may leave behind material that another technology can target later. A deposit that does not justify additional processing under current costs could become attractive when energy requirements fall, a new separation method emerges or the value of a particular mineral increases.

This is already visible in mine waste. What was once dumped because it contained too little recoverable metal can become a resource when the economics change.

That creates an uncomfortable question for an industry that talks constantly about resource efficiency: are today's mines measuring recovery only against what is possible now, or are they also thinking about what may be possible later?

Recovery rates alone cannot answer that. A technology recovering 90% of a mineral is not automatically better than one recovering 60%. Power consumption, water use, reagents, capital costs, reliability, feed characteristics and commercial scale all affect the result.

But neither should the remaining 10%, 20% or 40% automatically disappear from the conversation once a mine closes.

What Happens to the Minerals That Cannot Be Recovered Yet?

 Mining company may consider a particular waste stream uneconomic today. A startup working on a new leaching, sorting or separation process may see the same material differently a few years later.

That does not mean mining companies should deliberately leave valuable minerals behind. It means the industry needs to think about what happens to material that today's technology cannot economically recover.

If a tailings facility contains copper, cobalt or other valuable minerals, should there be stronger requirements to identify what is in that material, document its processing history and maintain records that could help a future operator assess it?

That would not reserve the material for startups or force today's mines to operate at lower recovery rates. It would keep the door open for future recovery as technology changes, giving African mining startups a potential opportunity to extract value from material that has already been mined but still contains minerals that current processes cannot recover economically.

Africa could, in effect, mine the same resource twice. The first generation extracts what today's economics make viable. The next generation returns with better technology and recovers value that the first could not.

That is not necessarily a failure of the first mine. It is what happens when technology changes faster than the mineral resource itself.

Keeping Tomorrow’s Recovery Open

Zambia's 2024 Minerals Regulation Commission Act already recognises that mineral resources are non-renewable and should be conserved, developed and used prudently, while avoiding wasteful mining practices. The law also gives the regulator powers to intervene where wasteful mining practices occur. The bigger question is how that principle should apply when what counts as recoverable keeps changing.If Africa's mineral resources are finite, perhaps the question should not only be how much today's technology can recover.

It should also be what today's mining industry does with the value it cannot recover  and whether it leaves enough information and opportunity for the next generation of African mining technology to go after it. The technology will keep changing the minerals will not.