Deep-Sea Mining: Potential Riches and Environmental Concerns

More than 13,000 feet beneath the Pacific Ocean, a massive 70-ton machine operated by The Metals Company successfully traversed a tenth of a mile, collecting potato-sized nodules rich in copper, manganese, cobalt, and nickel. This pilot run in 2022 marked a significant step towards commercial deep-sea mining.

The Metals Company aims to receive approval to deploy similar machines across a 65,000 square kilometer area to extract over 600 million metric tons of these valuable nodules. These deposits, composed of critical minerals, have been largely inaccessible, but advancements in technology are changing that.

Currently, The Metals Company's efforts are part of a broader movement involving 31 initiatives from various countries and entities—including China, India, and the Republic of Nauru—to analyze and test mining equipment for deep-sea resources. This interest is driven by an increasing global demand for critical minerals, which could see a fourfold increase as the world shifts towards cleaner energy solutions, according to the International Energy Agency (IEA).

While proponents argue that deep-sea mining could supplement terrestrial resources, there is significant opposition from researchers, conservation groups, and more than 40 countries, led by Palau. They advocate for a ban or moratorium on deep-sea mining until more is known about its ecological impacts and robust regulations are established.

The International Seabed Authority has been working for over a decade on a mining code to regulate seabed resource extraction, but member states have yet to reach an agreement. Recent talks concluded in July 2025 with many unresolved issues surrounding ecological impact assessments and monitoring.

Time is of the essence, as commercial mining could commence as early as this year, potentially bypassing established regulations. Nauru is considering a legal loophole to apply for commercial permits ahead of the finalized mining code, while The Metals Company has sought permission from the United States to mine in the Clarion-Clipperton Zone, a vast area of international waters between Hawaii and Mexico.

Analysts are urgently exploring whether the required minerals can be sourced from land or whether deep-sea resources must be tapped. The IEA's 2025 assessment indicates that the green transition will necessitate a significant increase in the supply of critical minerals, with anticipated shortages in key metals like lithium and copper as early as 2035.

Despite differing opinions, there is consensus that the transition to green energy will require a substantial rise in the global supply of critical minerals. The IEA predicts that by 2040, lithium demand could increase nearly fivefold, while copper demand may rise 1.3 times.

Some experts argue that land-based solutions can meet these demands by opening new mines or expanding existing ones. Gavin Mudd, director of the Critical Minerals Intelligence Centre at the British Geological Survey, emphasizes that there are still ample mineral deposits on land, and reserves are likely to grow as new discoveries are made.

However, to meet rising demands, significant investments in new mining projects will be necessary. The IEA estimates that over 85 new lithium mines and at least 35 new copper mines will be required by 2050 to support the green transition.

It often takes over a decade to establish a new mining project, leading some experts to stress the importance of improved planning to avoid future mineral shortages. Recycling efforts for materials like electric vehicle batteries could also mitigate the urgency of new mining operations, with estimates suggesting that recycling could reduce the need for new mines significantly by 2050.