What Is Manganese
Manganese is element 25 — a hard, brittle, grey-white metal that is the fourth most consumed metal in the world by volume, behind only iron, aluminum, and copper. It is not rare. It is not glamorous. It does not appear in headlines about critical minerals supply chains the way lithium, cobalt, or rare earths do. And yet no steel can be made without it, and no modern battery chemistry that uses manganese can substitute away from it. The invisibility is the story.
Manganese is found in the earth's crust in significant concentrations across multiple continents. The ore supply is geographically distributed in a way that rare earths are not. What is not distributed is the processing infrastructure — the industrial capacity to convert manganese ore into the refined forms that steelmakers, foundries, and battery manufacturers actually use. That processing happens overwhelmingly in China, through a supply chain structure that mirrors rare earths in its concentration even though the underlying geology does not.
Plain English
Manganese is everywhere in the ground. The processed forms that industry needs are made almost entirely in China. The ore is African and Australian. The product is Chinese. That gap is the story.
Manganese is not rare. It is just invisible — until the supply chain breaks.
What Manganese Does
The steel application is the foundation and it is enormous. Every tonne of steel produced anywhere in the world requires approximately 6–9 kilograms of manganese, added during the steelmaking process to deoxidize (remove oxygen from) and desulfurize (remove sulfur from) the molten metal, and to improve hardness, toughness, and wear resistance in the finished steel. There is no substitute for manganese in steelmaking. Silicon and aluminum can partially substitute for its deoxidizing function, but not for its strengthening and desulfurization roles at commercial scale. Global steel production runs at approximately 1.9 billion tonnes per year. At 7 kg of manganese per tonne of steel, that is roughly 13 million tonnes of manganese consumed annually in steel alone — making it one of the highest-volume industrial metal applications on earth.
Manganese enters steelmaking in three processed forms. Ferromanganese (an iron-manganese alloy, typically 70–80% manganese by weight, produced by smelting manganese ore with coke in an electric arc furnace) is the primary addition for high-carbon steel grades. Silicomanganese (a manganese-silicon-iron alloy, typically 60–70% manganese and 14–20% silicon) is used for lower-carbon steel and combines the deoxidizing functions of both elements. Electrolytic manganese metal (EMM — high-purity manganese produced through an electrolytic refining process, typically 99.7%+ purity) is used in specialty steel, aluminum alloys, and increasingly in battery applications where purity requirements are strict.
The battery application is growing and structurally significant. LMFP (lithium manganese iron phosphate — a battery chemistry that adds manganese to the LFP formulation to improve energy density while retaining LFP's cost and safety advantages) is gaining commercial traction in China's EV market. High-manganese battery chemistries including LNMO (lithium nickel manganese oxide) are under active development for next-generation cells. Battery-grade manganese sulphate (HPMSM — high-purity manganese sulphate monohydrate, the precursor form used in cathode manufacturing) represents a growing and premium-priced demand stream separate from the bulk steelmaking market.
Plain English
Every tonne of steel needs manganese. There is no substitute. The EV battery transition is adding a second demand stream on top of the steel anchor. Both are growing. Both draw on processing infrastructure concentrated in China.
Manganese is the metal that makes steel possible and is quietly becoming the metal that makes batteries better.
The Steel Metal Nobody Tracks
Every tonne of steel made anywhere in the world requires manganese. There is no substitute. The ore comes from Africa and Australia. The processing happens in China. This is not a new vulnerability — it is an old one that nobody bothered to name.
The supply chain structure is straightforward and underappreciated. South Africa and Gabon hold the world's largest high-grade manganese ore deposits and supply the majority of globally traded ore. Australia's Northern Territory holds the world's highest-grade single manganese ore operation. These three jurisdictions — South Africa, Gabon, and Australia — mine most of the world's manganese ore. China imports that ore, converts it into ferromanganese, silicomanganese, and electrolytic manganese metal in its own processing facilities, and supplies the global steel industry.
China accounts for approximately 90% of global electrolytic manganese metal production and a dominant share of ferromanganese and silicomanganese output. The processing concentration is extreme even by critical minerals standards. The steelmakers in Europe, Japan, South Korea, and the United States that depend on manganese alloys for their production are largely buying Chinese-processed material.
The reason this hasn't generated the same policy response as rare earths or gallium is partly historical — manganese's use in steelmaking predates the modern critical minerals discourse by a century — and partly structural. Manganese ore is not controlled by China. The dependency is on Chinese processing, not Chinese geology. That distinction made the vulnerability harder to articulate before the export control era made processing concentration an explicit policy concern.
The battery transition is making the dependency harder to ignore. Battery-grade HPMSM requires purities that China's existing electrolytic processing infrastructure is well positioned to supply, and the same processing concentration that defines the steel supply chain is now extending into the battery supply chain before Western alternatives have been built.
Plain English
Steel has needed manganese for over a century. Nobody classified it as a critical mineral because the ore is in Africa and Australia — countries that are not adversaries. The problem is the processing, which is Chinese. The battery transition is extending the same dependency into a new application before Western processing capacity exists to serve it.
The ore being in Africa does not mean the supply chain is safe. It means the vulnerability is harder to see.
Where It Comes From
Manganese ore production is more geographically distributed than most critical minerals. South Africa holds approximately 70% of global known manganese reserves and is the world's largest ore producer, with major operations in the Kalahari manganese field — the largest known manganese deposit on earth. Gabon is the second-largest producer, with Eramet's Moanda mine among the highest-grade operations globally. Australia's Groote Eylandt in the Northern Territory — operated by South32 through the GEMCO joint venture — produces some of the world's highest-quality manganese ore. Ukraine, Brazil, India, and China also produce ore, though Chinese domestic ore grades are generally lower than South African or Australian material.
The ore geography matters less than the processing geography. China imports South African, Gabonese, and Australian ore and converts it into the processed forms — ferromanganese, silicomanganese, EMM — that steelmakers and battery manufacturers purchase. China's processing dominance reflects decades of industrial investment in electric arc furnace capacity for ferroalloy production and electrolytic refining infrastructure for EMM. Both are capital-intensive, energy-intensive, and have been built at Chinese scale that Western producers have not matched.
Western ferroalloy production exists — Norway is a significant silicomanganese producer using hydroelectric power, and South Africa has some domestic processing capacity — but neither provides the scale to substitute for Chinese supply in a disruption scenario.
The battery-grade supply chain is even more concentrated. HPMSM production requires wet chemistry processing from manganese ore or EMM that is almost entirely located in China. Western battery supply chains seeking non-Chinese HPMSM are building from a near-zero starting point. Projects in Australia — including Firebird Metals' Oakover development and others — are targeting this gap, but commercial production remains years away.
Plain English
The ore is in South Africa, Gabon, and Australia — politically stable, non-adversarial jurisdictions. The processing is in China. The battery-grade purification layer is almost entirely in China. Solving the ore supply geography is the easy part. Solving the processing geography is the hard part, and it is where the decade-long build is focused.
The Market Structure
Manganese markets trade in multiple distinct products at different price points reflecting different processing levels. Manganese ore (typically quoted as a percentage of manganese content, with 37–44% Mn ore as the benchmark grade) trades as a bulk commodity at prices set by the South African and Australian mining operations. Ferromanganese and silicomanganese (the primary steelmaking additions) trade at prices that reflect both ore costs and processing margins. Electrolytic manganese metal trades at a significant premium to ore and ferroalloys, reflecting the energy and capital intensity of the purification process.
The SMM admin benchmark for EMM ex-works China sits at approximately $1,700 per tonne, with the verified April 2026 range across sources running $1,700–2,800 per tonne depending on grade and specification. The range reflects both different purity grades and different market tiers — Chinese domestic industrial buyers transacting at lower prices than Western buyers accessing export-priced material.
EMM prices have been under pressure relative to 2021–2022 peaks, reflecting Chinese domestic oversupply of processing capacity against softer steel demand in China's own construction sector. The battery-grade HPMSM market trades at significantly higher prices than standard EMM, reflecting purity premiums and the nascent but growing demand from EV cathode manufacturers.
The price structure matters for the investment thesis in battery-grade manganese. HPMSM at battery grade commands premiums that make Western project economics more viable than bulk EMM pricing suggests — but the market for battery-grade manganese is still forming, and pricing visibility is limited compared to the established steelmaking market.
Plain English
Bulk manganese for steelmaking is cheap and Chinese-priced. Battery-grade manganese is more expensive and where the Western development projects are targeting. The premium exists because the purity requirements are strict and the non-Chinese processing capacity to meet them barely exists. That gap is what the Australian projects are racing to fill.
Why It's on This List
ScarceEarth covers manganese because it is the largest-volume critical mineral with the least policy attention relative to its strategic importance — and because the battery transition is creating a new premium demand stream that is extending the existing processing dependency into a new application before Western alternatives exist.
The steel dependency is old and stable — not likely to produce an acute supply crisis in the way gallium or tungsten might, but permanently relevant as long as steel production continues. At 13 million tonnes of manganese consumed annually in steelmaking alone, any disruption to Chinese ferroalloy processing would immediately affect steel production globally. The scenario is not implausible. It simply has not happened yet.
The battery dependency is new and building. LMFP battery chemistry is gaining commercial traction in China's EV market and beginning to appear in international vehicle programs. Every LMFP battery requires HPMSM. The processing infrastructure to produce HPMSM outside China is being built from scratch, with Australian projects at the most advanced stage. The timeline for Western HPMSM production at meaningful commercial scale is 2027–2030 at the earliest.
The combination — an old steel dependency that generates no policy urgency plus a new battery dependency that is building before Western capacity exists — is the manganese story in 2026. Watch the battery-grade processing layer, not the ore supply.
Plain English
Manganese has been essential to steelmaking for over a century without generating a critical minerals conversation. The battery transition is adding a new dependency on the same Chinese processing infrastructure before Western alternatives exist. The ore is not the problem. The processing is. And the new processing requirement — battery-grade purity — is harder and more expensive than the steel-grade requirement the world already depends on China to meet.