has participant abyssal plain deep marine sediment marine bathyal zone biome marine abyssal zone biome marine hadal zone biome benthic deep-sea mining A mining process during which materials are extracted from benthic environments deep below the ocean surface, where no stellar radiation reaches.. deep-seafloor mining "The most valuable of the marine mineral resources is petroleum. About 15% of the world's oil is produced offshore, and extraction capabilities are advancing. One of the largest environmental impacts of deep sea mining are discharged sediment plumes which disperse with ocean currents and thus may negatively influence the marine ecosystem. Coal deposits known as extensions of land deposits , are mined under the sea floor in Japan and England." deep seafloor mining marine mining