Medium and heavy rare earth elements account for approximately 54% of the rare earth content found in deep-sea mud recovered off a remote Pacific island, according to findings reported by The Northern Miner. The discovery bolsters Japan's efforts to secure domestic supplies of critical minerals at a time when China has been tightening export controls on rare earth materials.

Rare earth elements are a group of 17 metallic elements essential to a wide range of modern technologies, including electric vehicle motors, wind turbines, smartphones, and advanced defense systems. They are broadly categorized into light rare earth elements (LREEs) and heavy rare earth elements (HREEs), with the latter being comparatively scarcer and more economically valuable.

Deep-sea mud deposits have attracted growing scientific and commercial interest as a potential alternative source of rare earths. Japan has been actively surveying seabed mineral resources within its exclusive economic zone, aiming to reduce its reliance on imported critical minerals. The strategic push is part of a broader effort by industrialized nations — including the United States, the European Union, and Australia — to diversify critical mineral supply chains and reduce dependence on a single dominant supplier.

China is the world's largest producer of rare earth elements and has implemented increasingly strict export control measures on these materials, raising concerns among importing nations about supply chain security. However, commercial-scale extraction of rare earths from deep-sea mud remains unproven, and seabed mining continues to face unresolved questions around environmental impact, regulatory frameworks, and technological feasibility before it can meaningfully contribute to global supply.

Source: The Northern Miner