In January 2013, a deep-sea research vessel from Japan obtained seven samples of mud collected two to four meters below the seafloor at 5,600 to 5,800 meters in depth, near Japan’s Minami-Tori-shima Island, also known as Marcus Island, within Japan’s exclusive economic zone (EEZ).
Analyzing the mud revealed that it contained extreme concentrations of rare earth minerals. Continued research since then has led to an announcement that the region contains more than 16 million tons of rare earth minerals. These elements are needed to build high-tech products ranging from mobile phones to electric vehicles.
This find is being described as a “semi-infinity” supply of rare earth minerals, enough to supply all of Japan’s needs for well over a century. However, getting at the resources will be an issue, since they’re almost four miles underwater. Japan Times and Fortune and Nikkei Asian Review