Industries are classified based on the source of their raw materials. Agro-based industries use agricultural produce (e.g., cotton, jute, sugar), while mineral-based industries use minerals (e.g., iron ore, bauxite, limestone). Sugar industry uses sugarcane (agro-based), and Iron and steel industry uses iron ore, coking coal, and limestone (all mineral-based). Cotton and Jute textiles are agro-based, not mineral-based. Aluminium smelting uses bauxite (mineral-based), not agro-based.