(i) Mineral: The elements or compounds, which occur naturally in the earth’s crust, are known as minerals.
(ii). Ore: If minerals contain a very high percentage of a particular metal and the metal can be profitably extracted from it. These minerals are called ores.
(iii). Gangue: Ores mined from the earth are usually contaminated with large amounts of impurities such as soil, sand, etc., called gangue.
