|'''Return of InvestmentProfit/MinHour'''|| 2.133...%$576
|-
|'''True Return of Investment/Min'''|| 2.133...4%
|-
|'''AliasesTrue Return of Investment/Min'''|| 2.4% |-!colspan="2"| 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.