Manganese is an essential industrial metal critical for steel production and increasingly vital for next-generation battery technologies. Its ability to improve steel strength, toughness, and wear resistance underpins over 90% of current global manganese demand. Emerging battery chemistries, particularly nickel-manganese-cobalt (NMC) cathodes, are expected to drive a surge in manganese demand, positioning it as a strategic material for both industrial and clean energy economies. However, supply chains are fragile and heavily concentrated, exposing global markets to serious risks.
- Key uses: Steel production (ferromanganese alloys), EV batteries (NMC cathodes), chemicals, fertilizers
- Physical properties: High hardness, anti-corrosive properties, essential in improving strength and workability of steel
- Projected demand: Expected to rise significantly, with battery-grade manganese demand growing over 1,000% by 2040 (Benchmark Mineral Intelligence)
- Supply concentration: Dominated by South Africa, Australia, Gabon, China
- South Africa supplies over 30% of global manganese output but faces systemic infrastructure issues, including frequent power outages and rail bottlenecks.
- Australia and Gabon provide stable secondary sources but are limited by logistics and export capacity constraints.
Environmental and Social Criticisms:
- Mining impacts: Manganese mining generates significant waste material and dust pollution, with associated risks of soil degradation, water contamination, and air quality reduction.
- Worker health risks: Prolonged exposure to manganese dust has been linked to neurological disorders such as manganism, a Parkinson’s-like condition, highlighting occupational health risks in mining communities.
- Infrastructure degradation: In South Africa especially, manganese transport relies heavily on outdated rail and port systems, leading to environmental degradation along transit corridors and further straining regional ecosystems.
- Battery recycling lag: While steel-related manganese is recyclable through traditional scrap processes, battery-grade manganese recycling infrastructure remains underdeveloped, leaving a critical circularity gap in future supply.
Geopolitical and Market Risks:
- Single-country vulnerability: South Africa’s dominance in manganese exports creates acute exposure to local political instability, energy crises, and labor unrest.
- Strategic bottlenecks: High-purity manganese refining capacity is concentrated in China, raising concerns about dependency risks as EV battery markets expand rapidly in the United States and Europe.
- Deep-sea mining controversies: Interest in extracting manganese from polymetallic nodules on the seafloor introduces potential alternative supply sources but raises profound environmental and ethical questions about ocean ecosystem disruption.