Common Ore Mine
From OPU Wiki
A Common Ore mine is created by a Robo-Miner. A Ore mine can only be built over a Surveyed mine, and The color of the yield bars must be Orange to build a Common Ore mine.
The yield of the mine is dependant on the number of "bars" that are shown. The picture above has 3 bars, which is the best yield there is in Outpost 2: Divided Destiny.

