I'm playing on a galaxy s8. When I queue mines to be built, for example an ore mine, nothing happens. The outline of the building is there but the builders do nothing. When I try to assign a builder to the mine, the builder moves into position but then nothing.
Ore miners build the ore mines, not builder bots. If you are using ore miners, make sure you have the resources required to build the mine. Ore mines require 500 ore to build.
https://www.my-colony.com/reference/general.html?search=ore%20mine#OreMine