Changes

The steel mill is a facility that produces 1x [[steel]] every 35 seconds. [[steel]] used mainly for Construction Material rather than production input. the The List of Building that use [[steel]] can be seen below.

A Steel Mill need 1 [[Iron mine]] and 1 [[Coal mine]]. You need 4 more [[Iron mine]] for every 7 [[Steel mill]] and 1/7th of a more [[Coal mine]] for every 7 [[Steel mill]].</br>For every 50x production it'll have 1 excessive [[Iron]] and 2/for every 5x production, it will have 3 of an excessive [[Iron mineCoal]] to maintain this factory.

== Ratio ==You need 3 4/7 of a [[Coal mine]] and 14 1/7 of an [[Iron mine]] to maintain this factory. In other words, You need 4 [[Coal mine]] and 21 1 [[Iron mine]] for 7 [[Steel mill]] to create fully passive production line without excessive input. 1 [[Steel mill]] : 1 [[Iron mine]] : 1 [[Coal mine]] at minimum</br>4 [[Iron mine]] : 7 [[Steel mill]]</br>1 [[Coal mine]] : 7 [[Steel mill]] '''Disclaimer: The ratio above is only for calculation only. The real value may vary.'''