Manganese Nodules and Deep Sea Mining: The New Frontier of Resource Extraction

Manganese Nodules and Deep Sea Mining: The New Frontier of Resource Extraction

Deep sea mining for manganese nodules is advancing toward commercial operations, promising access to trillions of dollars in critical minerals while raising unprecedented environmental concerns.

The Resource

Manganese nodules on the ocean floor contain:

• Manganese: 30% — essential for steel production
• Nickel: 1.5% — batteries for EVs
• Copper: 1.3% — electronics and infrastructure
• Cobalt: 0.3% — batteries
• Rare earth elements: — electronics and defense

Estimated value: Trillions of dollars in the Clarion-Clipperton Zone (Pacific Ocean) alone.

The Companies

• The Metals Company (TMC): Most advanced, planning commercial extraction by 2028
• DeepGreen: Focused on nodules in the Pacific
• UK Seabed Resources: UK government-backed
• China Ocean Mineral Resources: State-owned, actively exploring

The Environmental Debate

Proponents argue:

• Less environmental damage than terrestrial mining (no deforestation, no child labor)
• Lower carbon footprint per ton of mineral
• Can reduce dependence on mining in politically unstable countries

Opponents warn:

• Sediment plumes could damage marine ecosystems for kilometers
• Noise pollution affecting marine mammals
• Unique deep-sea species yet to be discovered could be destroyed
• Mining impacts could be irreversible on human timescales
• Carbon stored in deep-sea sediments could be released

Regulatory Status

• International Seabed Authority (ISA): Governs deep-sea mining in international waters. 167 member states.
• Commercial mining rules still being negotiated
• 30+ countries calling for moratorium or ban
• France, Germany, and several Pacific nations strongly opposed
• China, Norway, and some developing nations supportive

The Geopolitics

Deep sea mining could reshape resource geopolitics:

• Reduce dependence on China (which processes 70%+ of rare earths)
• Create new resource conflicts in international waters
• Benefit developing nations through ISA revenue sharing

Timeline

• 2026-2027: ISA rules finalized
• 2028: First commercial extraction likely
• 2030: Potential for 10+ mining operations