The " Hughes Glomar Explorer " was publicly believed to be mining manganese nodules on the sea floor.
12.
Also on the seabed are manganese nodules formed of layers of iron, manganese, and other hydroxides around a core.
13.
Exploration of the ocean bottom in the last fifty years revealed manganese nodules and phosphate nodules in many locations.
14.
Kennecott Copper had explored the potential profits in manganese nodule mining and found that it was not worth the cost.
15.
Manganese nodules are rock concretions on the sea bottom formed of concentric layers of iron and manganese hydroxides around a core.
16.
Metals such as copper, zinc, nickel, and lead will be obtained from manganese nodules or the Phosphoria formation ( sic ! ).
17.
Nautilus and Australia's science agency say the deposits they are prospecting are in much shallower, more accessible waters than the ocean-bottom manganese nodules.
18.
The concentrations were much greater than those of the manganese nodules that litter the global seabed and first prompted dreams of deep mining.
19.
Sumitomo has built an experimental device that can be towed to depths of 5, 000 meters, or 3.1 miles, to gather manganese nodules.
20.
The hot deposits are very different from the icy manganese nodules that litter the global seabed and first prompted dreams of mining the deep.
