The fossils that are needed for the metal being produced.

To get the metal, the ore that contains it is initially mined. Ores are different. Iron is obtained from hematite, calcium from limestone, sodium from rock salt, copper from chalcopyrite, titanium from rutile, aluminum from bauxite, and gold from native gold. Many other different ores exist in nature. It should also be noted that for smelting metal in a blast furnace, coal is also needed, burning which to obtain the required temperature for smelting metal from hematite ore.