www.steel.org
http://en.wikipedia.org/wiki/Steel
lots of links in the article to other steel production sites
It all depends on what you are modeling: Basic Oxygen Furnace, Blast Furnace, Blast Oxygen Furnace, Electric Arc Furnace, Open Hearth, Rolling Mill, etc, as to the actual quantities for production of steel.
The working volume of a conventional blast furnace is the volume through which the gas produced at the tuyeres passes in contact with the materials in the furnace charge. The theoretical speed at which the materials of the furnace charge descend in the furnace is about 10 feet per hour for air-blown blast furnaces, and the materials charged into the furnace to produce one ton of iron typically comprise about 2 tons of ore, 0.9 tons of coke, 0.4 tons of limestone and 3.5 tons of air.
http://www.freepatentsonline.com/4670049.html
The ingredients:
http://www.bluescopesteel.com/index.cfm?objectid=AF539F93-AEF2-49D5-87D0BE42CDF23055
An EAF furnace is charged with about 86 percent scrap steel, and 14 percent iron.