Steel Mill

Benefit

 * Building the Steel Mill is going to test your resource strain, but this is a necessary step in order to reach any unit requiring Steel in order to work with.

Description

 * The Steel Mill will combine Iron AND Coal to make Steel. No other mills are this demanding. The Steel Mill knows it is high maintenance, and deep down it secretly likes it this way.

Production
 NOTES :
 * Based on this information, you only need 1/4 of the Steel cost in Coal.
 * The Railcar of Rebar is the most efficient way of converting Steel, allowing you to produce 500 Steel every 4 Hours for a total of 500 x 6 = 3,000 Steel in a 24-Hr day.
 * Provided you have the Iron to match, a single regular Coal Mine (30 Coal/Hour) will yield 720 Coal/day and thus allow you to produce ~1,500 Steel/day.
 * A single Advanced Coal Mine (60 Coal/Hour) will yield 1,440 Coal/day equivalent to ~3,000 Steel/day provided you have the Iron (4,500 Iron/day) with a single Steel Mill.

So with 2 Steel Mills, 2 Advanced Coal Mines and 6 advanced Iron Mines one could theoretically produce 6,000 Steel per day. Plan accordingly.