Full Breakdown
Massive Underwater Gold-Silver Deposit Discovered in the Western Pacific
By Drooid · · How we work
Discovery Overview
Chinese scientists announced the identification of a large seafloor massive sulfide (SMS) deposit in a high-temperature hydrothermal field within China’s exclusive economic zone in the western Pacific. The 18-day expedition, conducted aboard the research vessel Xiang Yang Hong 10, departed Shenzhen on August 10 and included seven deep-submergence dives. Researchers from Tsinghua University, the Qingdao Institute of Marine Geology, and Shanghai Jiao Tong University mapped three conical sulfide mounds and collected ore samples. Preliminary laboratory analysis reported gold concentrations of up to 0.45 troy ounces per US short ton (?15.4 ppm) and silver grades reaching 36.3 troy ounces per US short ton (?1 kg per tonne, or 1,271 ppm).
Scientific Context and Exploration Methods
The deposit lies in a back-arc basin where super-hot, metal-rich fluids (>315 °C) emerge from vents at depths of roughly 700–1,500 meters and mix with near-freezing seawater, precipitating sulfide minerals such as chalcopyrite, pyrite and sphalerite. The team employed an autonomous underwater vehicle for large-scale preliminary surveys, followed by a self-developed deep-sea controllable visual sampler for precise sampling.
Economic Potential and Challenges
The unusually high precious-metal grades exceed typical terrestrial deposits, suggesting “extremely high exploitation value.” However, extracting minerals from such depths remains technically demanding and raises environmental concerns, as noted by the researchers.
Official Statements & Responses
Song Shiji, deputy director of the Institute for Ocean Engineering at Tsinghua University, emphasized the deposit’s significance for both resource extraction and scientific study of extreme seabed ecosystems.
Verbatim Quotes
- “The [large seabed mining area] has extremely high exploitation value,” — Song Shiji, deputy director of the Institute for Ocean Engineering of Tsinghua University
- “We conducted a large-scale preliminary exploration with an autonomous [underwater] vehicle, and then used our self-developed deep-sea controllable visual sampler for detailed exploration and precise sampling,” — Song Shiji, deputy director of the Institute for Ocean Engineering of Tsinghua University