|'''Return of Investment/Min'''|| 12.7454%|-|'''True Return of Investment/Min'''|| 2.4%
|-
!colspan="2"|'''True Return of Investment/Min'''|| 1.745% Aliases
|-
|'''Aliases'''|colspan="2" |coal mine, coalmine
|}
[[Category:Facility]]
The coal mine is a facility that produces 8x [[coal]] every 10 seconds. this is best budget option for high profit in early games. it also works very well in mid until late game for Coal Power Plant.