Mining
Playing Stars!
Most of a planet's minerals lay under the surface, unavailable for use until your colonists mine them. You can build mines on your own worlds, or use robot miners to mine uninhabited worlds.
The mineral content of a planet is shown in the Selection Summary pane and the Minerals on Hand tile. The number of mines that have been built and that can be operated also appear in the Minerals on Hand tile.
Read more about Mining:
Mining Colonized Worlds
Remote Mining
Read about Mines:
Mines, Mineral Concentration and Player Efficiency