When a faction is given use of a Mining Commission scanner, they have one hour to find the mineral deposits that it has been calibrated to detect. Once a seam has been located, they will collect a sample from where the minerals are visible from the surface.
This sample will have a small value and can be used for crafting, it will not count towards the faction total, but scans of the area performed by someone with a standard mineralogical scanner and appropriate skill will allow the Mining Commission to estimate the value of the whole deposit