The main minerals found in ocean sediments are: sodium chloride (salt), potassium, sand, gravel, limestone, calcium sulfate hydrate (gypsum), iron, manganese, copper, cobalt, nickel, phosphorites, zinc and copper, with associated lead, silver, gold, placer gold, tin, titanium, diamonds. The location and accessibility of theses minerals greatly varies. For example, salt, potassium and magnesium are found in sea water, but are typically extracted from deposits or beds (which form when sea water had been evaporated down significantly from its original volume). Such deposits or beds are often called ancient ocean deposits of sediments, and they are now located on land where marine conditions originally existed. Conversely, metals like iron, manganese, copper, cobalt, and nickel are located deep on the ocean floor and must be mined from there.
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