So many materials are found in the earth / nature (may be in the mines or in the hills/mountains) in abandon.But from all the materials one can't get or extract the required metal or any other thing economically. So the mineral ores are those materials found in the nature from which the extraction is economical. As for example: Iron Ore (Magnetite, Haematite etc), Aluminium Ore (Bauxite) etc.
