Polymetallic Manganese Nodules (PMN)
Polymetallic Manganese Nodules (PMN) are small potato-sized (from millimeters to tens of centimeters in diameter) lumps of material precipitated from seawater and sediment pore water at slow rates over millions of years and occur mainly on the deep seafloor. They contain approximately 24% manganese, compared to 35 to 55% manganese in land ore bodies, but […]
