China has released a national atlas of deep-sea mineral deposits, signaling that Beijing is treating seabed resource mapping as a state-scale program and adding pressure on the U.S., Japan, and other countries building out their own seabed mining efforts.
The atlas, announced this month by the China Geological Survey, draws on two decades of research and samplings at more than 10,000 locations. It maps the locations and concentrations of dozens of seabed resources across the East China Sea and the Yellow Sea — waters where China claims territory that neighboring nations dispute. The South China Sea is not covered.
Backed by a Five-Year Plan
The release aligns with a recently approved Chinese five-year plan that lists deep-sea minerals as a development priority. The sediments in question are rich in cobalt, nickel, manganese, and rare earths — the same materials U.S., Japanese, and European programs are pursuing to cut dependence on Chinese supply.
China already controls most of the world’s supply of key critical metals and rare earths and has used that dominance politically, including export restrictions against the U.S. and Japan during past disputes.
Pressure on Rival Programs
The announcement lands as other governments accelerate their own work. Japan said in February it had retrieved rare-earth-rich mud from depths of more than 6,000 meters, which Prime Minister Sanae Takaichi called a “world’s first.” Tokyo and Washington have since committed to support each other’s seabed projects. The Trump administration, meanwhile, is preparing lease sales near American Samoa and plans to permit commercial mining outside U.S. territorial waters without international approval.
“China is pouring enormous resources in an effort to emerge as a world-leading oceanographic power,” Bruce Jones of the Brookings Institution told The New York Times, noting the U.S. historically led in ocean science and that China is closing the gap.
Dual-Use Data
Detailed seabed mapping has applications beyond resource extraction. The same data that identifies a nodule field also gives a navy an understanding of the seafloor that matters in any future submarine engagement. “You can use it for science, and you can use it for warfare,” Jones said.
The atlas also supports maritime boundary claims. Under UNCLOS, nations can claim seabed beyond their 200-nautical-mile exclusive economic zone if they can prove their continental shelf extends further — a process that has driven much of the world’s ocean exploration. China has filed proposals to extend its continental shelf based on geological evidence, drawing borders Japan disputes. Analysts say publicly announcing a national atlas functions as another assertion of authority over contested waters.
Why This Matters for the Sector
The atlas raises the baseline for what a credible national seabed program looks like. Ten thousand sample locations over two decades is a benchmark most rival programs are still working toward. It also strengthens the strategic case for Western seabed mining — not just as a critical minerals play, but as a way to avoid ceding geological knowledge of the ocean floor to a single state.
Whether other nations respond with comparable public inventories, or whether programs like the U.S. National Offshore Critical Mineral Inventory accelerate, will be the clearest signal of how seriously Beijing’s move is taken.
