231. Minerals

Rajasthan's mineral geography begins with scale. The state covers 342,239 sq km, about one-tenth of India's area, and the Aravalli range cuts across it from south-west to north-east. This old fold belt, western desert basins, saline depressions and sedimentary sequences create a rare mixture of metallic, non-metallic, fuel and building-stone resources. The Department of Mines and Geology describes Rajasthan as the richest Indian state in variety of minerals and says it produces about 57 minerals. Rajasthan's mineral monopoly position is visible in lead, zinc, wollastonite, selenite and several industrial minerals; Rajasthan Mineral Policy 2024 also states that Rajasthan is the country's sole producer of lead, zinc, wollastonite, selenite, calcite and gypsum. The state map is therefore not one belt. Udaipur-Rajsamand-Bhilwara form a lead-zinc-rock-phosphate-marble zone; Jhunjhunu-Sikar-Alwar hold the Khetri copper tract; Nagaur-Ajmer-Rajsamand connect marble, limestone and salt; Barmer and Jaisalmer add hydrocarbons, lignite and natural gas. Mineral distribution follows relief, rock structure, basin depth and transport access. Udaipur's hard-rock belt supports underground metal mines; western basins support oil, gas and lignite; saline lakes at Sambhar, Didwana and Pachpadra arise from enclosed drainage and evaporation. The same physical variety explains why a district can appear in more than one mineral layer: Udaipur links zinc and phosphate, Nagaur links marble, salt and limestone, and Barmer links petroleum, lignite and refinery activity. The western half's aridity is not a background detail; it directly helps salt, gypsum and lignite localities stand apart from the wetter south-eastern metal and stone belts. The central Aravalli districts, by contrast, carry harder crystalline rocks, older mineralization and higher quarry density. This contrast is the base of Rajasthan's mineral regionalization. A complete map reading joins mineral, district, geological setting and economic use.