For every 50x production it'll have 1 excessive [[Iron]] and for every 5x production, it will have 3 excessive [[Coal]].
</br>Excess material can be sold or stockpiled in case bad regional modified.
== Ratio ==
Minimum:: 1 [[Steel mill]]: 1 [[Iron mine]] : 1 [[Coal mine]]
== Related facilities ==
'''As construction material'''
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*[[Oil refinery]]
*[[Bauxite mine]]