A mining platform can be constructed by a terraforming unit and increases the minerals output of an ocean square by +1, or +2 if Adv. Ecological Engineering has been discovered.
A mining platforms can only be built on ocean shelf squares (depth less than 1000m). With the discovery of Adv. Ecological Engineering, aquatic factions such as the Nautilus Pirates can also construct Mining Platforms on ocean and ocean trench squares.
A mine reduces the nutrient output of a square by one, but never below one.