Resource miners are very common mining stations placed adjacent to asteroids to harvest resources. Only Helium-3 and Mineral Ore can be harvested.
They are recommended to be the last modules on your priority list to upgrade and build. Resource miners containing resources that are destroyed by a raiding player gains a medium amount of resources, particularly if the player has large storage facilities. Players need not fight other VEGA fleets or raid bases to gain resources. While miners provide minimal income, they make a difference in the long run.
Mines Helium-3 to build, repair and research ships.
— In-Game Description
Helium-3 mining is a standard method of resource income. Helium-3 is needed to repair, build and refit ships. These often can come in handy in some particular scenarios such as the player being too busy outside of the game to fight VEGA fleets or if the player is locked into their base by larger alliances who threaten to destroy player's fleets that are launched.
Mines captured asteroids to unlock vast quantities of Mineral Ore, a critical resource for base research and construction.
— In-game description
Mineral Ore mining is a standard method of resource income. Mineral Ore is needed for upgrading base modules, researching all base technology as well as crafting technologies and produce crafting credits.