The purpose of a Mine is to mine for mineral resources. The mine itself is relatively small, measuring twelve blocks in width, length and height. When entered, the mine teleports your character underground, where you will find three resource deposits. You will find an assortment of plain rock, copper, iron and coal deposits in the mine.
This recipe is quite simple.
It's notable that by putting two mines in close proximity, they intersect and can cause the player to become stuck.