Cobalt mining is the extraction of cobalt, a silvery-blue metal, from underground ore deposits. Most of the world’s cobalt comes from copper-cobalt ores in the Democratic Republic of the Congo (DRC), which accounts for 74% of global cobalt mine production. The metal is essential to rechargeable batteries, particularly the lithium-ion batteries that power electric vehicles and smartphones, because it provides high energy density and thermal stability. Cobalt mining has drawn intense scrutiny for its environmental destruction and documented human rights abuses, especially in small-scale mining operations.
Where Cobalt Is Found
Cobalt rarely exists on its own. It’s almost always embedded in ores alongside copper or nickel, which means cobalt is frequently produced as a byproduct of mining those other metals. The Central African Copperbelt, stretching across the DRC and Zambia, holds the world’s only major sediment-hosted copper-cobalt deposits and is by far the dominant source. Outside Africa, cobalt comes from magmatic nickel-copper deposits and nickel laterite deposits in countries like Indonesia (which now accounts for about 7% of global production), Australia, Canada, and the Philippines. Smaller deposits exist in Morocco, where hydrothermal formations associated with ultramafic rocks contain cobalt, and in parts of the United States and Canada in metasedimentary and iron oxide-copper-gold formations.
How Cobalt Is Extracted and Refined
The process begins with conventional mining, either open-pit or underground, to pull copper-cobalt ore from the earth. That raw ore is sent to a processing plant where it’s milled into fine particles, then concentrated through flotation, a technique that uses water and chemicals to separate valuable minerals from waste rock.
What happens next depends on the ore’s chemistry. Sulfide ores need a pretreatment step (roasting or pressure oxidation) to convert them into a form that dissolves more easily. Oxide ores skip this and go straight into leaching tanks, where acid dissolves the target metals out of the concentrate. The resulting slurry passes through several rounds of solvent extraction, which progressively separates copper from cobalt and strips away impurities like iron, aluminum, and manganese. The cobalt-rich solution is then treated with magnesium oxide, causing cobalt to precipitate out as a crude compound with roughly 35% cobalt content.
This crude material, produced primarily in the DRC, is typically shipped to China for final refining. There, it’s dissolved again in sulfuric acid, run through additional purification steps to remove remaining impurities and separate cobalt from nickel, and eventually crystallized into battery-grade cobalt sulfate. The entire chain, from ore in the ground to battery-ready material, spans multiple countries and involves dozens of chemical processing stages.
Industrial Mining vs. Artisanal Mining
Cobalt mining in the DRC operates on two tracks. Large-scale industrial mines (LSM) use heavy machinery, engineered tunnels, and formal safety protocols. Artisanal and small-scale mines (ASM) are a different world: individuals or small cooperatives dig by hand, often on or near industrial concessions, using basic tools and little to no protective equipment.
The scale difference is significant. DRC cobalt production grew from 11,000 metric tons in 2000 to 98,000 metric tons in 2020. Artisanal production grew too, from roughly 1,000 to 2,000 tons in 2000 to 9,000 to 11,000 tons in 2020. At its peak around 2008, artisanal mining accounted for 40 to 53% of the DRC’s cobalt output. By 2020, that share had dropped to 9 to 11% as industrial operations expanded. Still, artisanal mining remains economically vital for hundreds of thousands of Congolese workers who have few other income options.
Worker Safety and Human Rights
A U.S. Department of Labor investigation found that 63% of all cobalt mining workers in the DRC reported getting hurt or sick because of their work. At artisanal sites, that figure rises to 72%. The most common injuries come from falling rocks and tool accidents.
Protective gear is scarce. Only 29% of artisanal miners report usually wearing any protective equipment, compared to 79% at industrial sites. The hazards are pervasive: 84% of workers face dust or strong fumes without protection, 77% use dangerous tools or heavy machinery without proper gear, and 77% carry unreasonably heavy loads. More than half deal with extreme heat without sufficient water or breaks, exposure to dangerous chemicals, excessive noise, and insecure tunnels that risk collapse.
Child labor remains a persistent problem. About two-thirds of workers at artisanal sites and a quarter of workers at industrial sites report that children are present and working at their mine. In total, roughly half of all cobalt miners work at a site where children are involved. The U.S. Department of Labor has directly linked DRC cobalt mining to both child labor and forced labor.
Environmental Damage
Decades of mining in the DRC and Zambia have caused severe, compounding environmental harm. The damage includes deforestation, soil erosion, loss of topsoil, and acidification of agricultural land surrounding mine sites. Surface and underground water sources are contaminated with heavy metals including lead, arsenic, cadmium, cobalt, copper, nickel, manganese, and uranium.
Artisanal miners often sieve soil directly in rivers, spreading contamination downstream. Tailings dams (the reservoirs that hold mining waste) generate toxic dust that blows into nearby communities. Smelter plant emissions further degrade air quality. The contamination reaches the food supply: studies have found elevated trace metals in cereals, root vegetables, fruits, and drinking water in communities near mines. Vegetation dies along polluted riverbanks, and crops grown on degraded farmland show stunted growth. Residents in mining areas describe relying on visibly polluted water for drinking, cooking, and bathing because no clean alternative exists.
Why Cobalt Matters for Batteries
Cobalt’s primary commercial value lies in lithium-ion batteries. In these batteries, the cathode (positive electrode) typically contains cobalt because it enables high energy density, meaning the battery can store more power relative to its weight. This makes cobalt-containing batteries attractive for electric vehicles, where range depends on packing maximum energy into minimum space. Cobalt also contributes to the thermal stability of battery cells, reducing the risk of overheating.
The tradeoff is cost and supply risk. Cobalt prices fluctuate dramatically with commodity markets, and the concentration of mining in one politically unstable country creates supply chain vulnerability. These pressures have driven a major industry push toward cobalt-free alternatives.
Cobalt-Free Battery Alternatives
Lithium iron phosphate (LFP) batteries have emerged as the leading cobalt-free option. They contain no cobalt or nickel, which sidesteps both the ethical concerns and the supply chain fragility. LFP batteries are cheaper to produce and last roughly four to five times longer than cobalt-containing batteries in terms of charge cycles. They can also handle high rates of charging and discharging.
The adoption curve has been steep. BYD launched its “Blade” LFP battery in 2020. Tesla began using iron phosphate batteries for the Chinese market that same year and expanded globally in 2021. The known weakness of LFP is lower energy density, which translates to less range per kilogram of battery weight. A newer variant, lithium manganese iron phosphate (LMFP), aims to close that gap. Gotion High Tech announced an LMFP battery targeting 240 watt-hours per kilogram, with mass production beginning in 2024.
Recycling and Supply Chain Shifts
Recovering cobalt from spent batteries is technically feasible and increasingly practiced. In 2023, recovery rates for cobalt from available feedstock exceeded 40%, with collection rates being the biggest bottleneck. Most electric vehicle batteries haven’t yet reached end of life in large numbers, so the recycling infrastructure is still scaling up. As millions of first-generation EVs age out over the coming decade, the volume of recoverable cobalt will grow substantially, potentially reducing dependence on newly mined material. Whether that potential is realized depends largely on policy incentives and collection systems that ensure dead batteries actually reach recycling facilities rather than landfills.