Industrial-scale mining in Africa to support global supply chains is leading to unprecedented deforestation across the continent, with 34 hectares of forest removed for every hectare of active mine site.
A study involving the University of Cambridge has found that 187,000 hectares of forest were lost to mining activity in Africa between 2001 and 2020 - an area roughly equivalent to the country of Mauritius.
Using satellite imagery and statistical modelling, researchers found that for every hectare (10,000 square metres) of active mine site in Africa, an additional 34 hectares of forest are lost to supporting infrastructure such as roads, housing settlements and agricultural land.
Demand for green energy transition minerals like copper and cobalt - essential for electric vehicles and renewables - is a primary driver of this deforestation, with demand expected to grow 40-fold by 2040.
The researchers warn that current environmental assessments drastically underestimate mining's true footprint, calling for ‘zero-deforestation’ supply chains to protect vital forests from being sacrificed.
This is the first large-scale study of mining-triggered deforestation across Africa, and compared deforestation rates in mined areas to geographically similar non-mined areas.
The study is published today in the journal Nature.
Mining for cobalt and copper was found to cause the highest rate of overall deforestation. These metals are critical components in renewable energy technologies, electric vehicles and household electronics. Mining for high value minerals such as gold and silver, and critical manufacturing minerals such as iron, also drives high rates of deforestation.
Professor David Edwards, Head of the Tropical Ecology and Conservation group at the Department of Plant Sciences, Cambridge, and senior author of the study, said: "Metals including cobalt and copper are critical components of technology from electric vehicles to smart phones and computers. But our study shows there are unintended consequences of the appetite for technology. We find that cobalt and copper mining drives particularly high levels of offsite deforestation, particularly in the hyper-biodiverse rainforests of the Democratic Republic of the Congo."
Co-lead author Dr Oscar Morton, from the University of Sheffield’s School of Biosciences, said: “The actual mines themselves are just the tip of the iceberg. It’s the extent of additional deforestation triggered by mining that is far greater, with new settlements, agriculture and transport routes posing a serious threat to vital forests across Africa.
“As demand for minerals continues to rapidly grow, it’s crucial that robust measures are put in place to limit the extra deforestation caused by mining and its supply chains.”
Researchers studied over 16,000 mines, from large-scale mines operated by multinational corporations to ‘artisanal’ mines, often operated by individuals, families or local cooperatives.
The scale of mining operations across Africa is a direct result of increased global demand, with the extraction of metal ores quadrupling on the continent since 1970. As the global appetite for key minerals underpinning the transition to green energy technologies continues to grow, demand is expected to increase 40-fold by 2040.
“As consumers of products that rely heavily on minerals mined in Africa, such as mobile phones, electric vehicles and solar panels, we are a part of a global supply chain that’s driving unprecedented deforestation across the continent,” said co-lead author Dr Chris Bousfield from the University of Sheffield’s School of Biosciences.
He added: “While these minerals are essential for fuelling the green energy transition, it’s vital that this does not come at the expense of the continent's already severely diminished forest habitats. We need to embed zero deforestation or no-net-loss supply chains across the mining industry, to match what’s beginning to happen in the food and drink industries.”
Africa holds the largest deposits of minerals vital to the green energy transition in the world, but its mining industry suffers from poor regulation and governance, lacks transparency and is linked to severe human rights violations.
Environmental impact assessments for new mines tend to consider only the immediate site, failing to factor in the footprint of associated infrastructure, which can stretch kilometres beyond the mine itself.
Prince Dégny Valé, a contributor to the study from the Côte d’Ivoire’s Université Jean Lorougnon Guédé, has a keen interest in the impacts of gold mining across the country. He said: “With nearly 30% of the world’s mineral resources, the rapid expansion of the mining sector in Africa is generating significant economic opportunities for both governments and local populations. However, this growing interest in mining is placing increasing pressure on natural ecosystems and local communities.
“In Sub-Saharan Africa, many developing countries sometimes face limited law enforcement capacity. Mining activities, in addition to causing habitat fragmentation and soil and water pollution, are at the centre of numerous social conflicts related to access to resources. This raises the challenge of reconciling economic development with biodiversity conservation.”
While the study focussed on Africa because of its rich deposits of key minerals that are integral to green technologies, researchers say it must be scaled up to a global level to build a holistic picture of the true environmental impact of mineral extraction.
Reference: Morton, O. et al: ‘Mining triggers extensive additional deforestation in sub-Saharan Africa.’ Nature, June 2026. DOI: 10.1038/s41586-026-10551-2.
Image: Mining at Muchacha, Democratic Republic of Congo, along the Ituri River. Credit: WCS/ICCN
Adapted from a press release by the University of Sheffield and republished from the central Cambridge University website. Read the original article on the University of Cambridge website.