The primary purpose of this space mine is to block access to the area that the mine occupies. No unit can enter or occupy the same space as a mine, presumably because it'll explode if they do. However, a space mine actually does not and cannot inflict damage to any unit; it merely serves as a barrier. Space mines can be removed by support craft, such as the Rr2o-3 Craft Module. Space mines that have been removed cannot be re-deployed.
UFMN-01 Mine -Space Mine-
Space mines constructed by the Space Corps to manipulate the battlefield terrain.