Design of Water Holding Bulkheads for CoalMines by V.S. Mutton and A.M. Rememnikov
Mine shaft also have a deeper bottom to collect water, in older mines with a relative low water income they run a "bucket" in the bottom of the shaft to take water as in a normal well.
In the modern times you have always the need to collect water in a point where you have installed your pump, and you do this digging some ditch along the tunnel for example.
Water can be very dangerous because digging tunnels you can encounter large mass of water, this happen for example during the dig of many tunnels that go trough Alps.