manganese nodule

(redirected from Polymetallic nodules)
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manganese nodule

n
(Geological Science) geology a small irregular concretion found on deep ocean floors having high concentrations of certain metals, esp manganese
References in periodicals archive ?
Evidence supporting that view is already available: In 1978, scientists performing an experiment scooped polymetallic nodules from the CCZ and left a track in the sediments that was 1.
Now that the deep sea mining of polymetallic nodules on the abyssal plain (4000 to 6000 m depth) of the central Eastern Pacific is to begin in the next few years, serious consideration must be given to the possible effects on the abyssal environment.
So it is polymetallic nodules in international waters that are covered by the 2000 regulation.
While the authority has issued seven contracts for exploration for polymetallic nodules, it has not had experience with exploitation, nor has it gained experience in overseeing the exploration or exploitation of other minerals, notably cobalt crusts and polymetallic sulfides.
Apart from knowledge acquisition and capacity building in the area of manned deep sea vehicle development, the manned submersible, with scientists onboard with suitable observation and intervention devices, can be a tool for exploration of mineral resources of the ocean like polymetallic nodules, cobalt enriched ferromanganese crust, polymetallic sulphides, hydrothermal vents, gas hydrates; exploration of deep-sea life forms; observation, intervention and engineering support for underwater activities; and underwater search and recovery operations.
The licence will allow exploration for polymetallic nodules at a site within the Clarion-Clipperton Fracture Zone of the Pacific.