3.Iron ore

Iron ore are rocks, minerals, or meteorites that are viable sources of iron. Typically, the iron is in the form of iron oxide. Iron ore is a mineral substance which, when heated in the presence of a reductant, will yield metallic iron (Fe). It almost always consists of iron oxides, the primary forms of which are magnetite (Fe₃O₄) and hematite (Fe₂O₃).

4.Coke

The solid residue of impure carbon obtained from bituminous coal and other carbonaceous materials after removal of volatile material by destructive distillation. It is used as a fuel and in making steel.