Learning Objectives
- Understand what minerals are, how they occur, and their classification
- Learn about the distribution of minerals in India
- Study conventional and non-conventional sources of energy
- Understand the need for mineral and energy conservation
Key Concepts
What are Minerals?
A mineral is a homogeneous, naturally occurring substance with a definable chemical composition. Minerals are formed by various geological processes and are found in different types of rocks. There are about 3,000 known minerals, but only a few hundred are commercially important.
Mode of Occurrence: Minerals occur in veins and lodes (formed in cracks of igneous and metamorphic rocks — tin, copper, zinc, lead, gold), beds or layers (formed in sedimentary rocks — coal, gypsum, potash, phosphates), placer deposits (found in alluvial deposits — gold, silver, tin, platinum), and in ocean waters (common salt, magnesium, bromine).
Ferrous Minerals
Iron Ore: India is rich in high-grade iron ore. Types: magnetite (best quality, 70% iron), haematite (most important industrial ore, 50-60% iron). Major deposits: Odisha (Mayurbhanj, Kendujhar — largest reserves), Jharkhand (Singhbhum), Chhattisgarh (Bailadila, Dalli-Rajhara), Karnataka (Sandur-Hospet, Bellary), Goa.
Manganese: Used in manufacturing steel and ferro-manganese alloys. Major producers: Odisha (largest), Karnataka, Madhya Pradesh, Maharashtra, Goa.
Non-Ferrous Minerals
Bauxite: Ore of aluminium. Found in laterite rocks. Major deposits: Amarkantak plateau (Madhya Pradesh), Maikal hills, Bilaspur-Katni plateau, Odisha (Koraput), Gujarat, Jharkhand, Maharashtra.
Copper: Used in electrical industry, electronics, chemical industries. Major deposits: Rajasthan (Khetri mines — largest), Singhbhum (Jharkhand), Balaghat (Madhya Pradesh).
Mica: Used in electrical and electronics industry due to its insulating and heat-resistant properties. India is the leading producer. Major deposits: Jharkhand (Koderma-Gaya-Hazaribagh belt — leading producer), Rajasthan (Ajmer), Andhra Pradesh (Nellore).
Conventional Energy Sources
Coal: Most abundantly available fossil fuel in India. Types by carbon content: anthracite (80%+ carbon, found in Jammu & Kashmir), bituminous (most widely used, Jharkhand, West Bengal, Odisha), lignite (low grade, Neyveli in Tamil Nadu, Rajasthan), peat (lowest grade). Major coalfields: Jharia (Jharkhand — largest), Raniganj (West Bengal), Bokaro, Giridih (Jharkhand), Korba (Chhattisgarh), Singrauli (Madhya Pradesh).
Petroleum: Found in sedimentary rocks in fault traps. Major sources: Mumbai High (63% of production), Gujarat (Ankleshwar), Assam (Digboi — oldest oilfield in India, Naharkatiya).
Natural Gas: Found with petroleum. Important source: Krishna-Godavari basin, Mumbai High, Cambay basin, Assam, Jaisalmer.
Non-Conventional Energy Sources
Nuclear/Atomic Energy: From uranium and thorium. India's thorium reserves are among the largest in the world (monazite sands of Kerala). Nuclear power stations: Tarapur (Maharashtra), Rawatbhata (Rajasthan), Kalpakkam (Tamil Nadu), Narora (UP), Kakrapar (Gujarat), Kaiga (Karnataka).
Solar Energy: India is a tropical country with 300 clear sunny days. The largest solar plant was established at Madhapur near Bhuj (Gujarat). India has significantly expanded solar capacity in recent years.
Wind Energy: India has the largest wind farm cluster at Nagercoil to Madurai in Tamil Nadu. Other wind farm locations: Gujarat, Rajasthan, Maharashtra, Karnataka, Andhra Pradesh. India is a leading wind energy producer globally.
Biogas: Produced from organic waste (cow dung, plant waste). Used for cooking and lighting in rural areas. The National Project on Biogas was launched by the government.
Tidal Energy: Potential in Gulf of Kutch, Gulf of Khambhat, and Sundarbans delta.
Geothermal Energy: Potential in Puga Valley (Ladakh) and Parvati Valley (Himachal Pradesh).
Conservation of Minerals and Energy
Minerals take millions of years to form and are non-renewable. Conservation measures: using minerals judiciously, recycling metals, using substitutes, reducing waste, improving technology. For energy: using public transport, switching off unnecessary appliances, using LED lights, promoting renewable energy.
Summary
India has diverse mineral resources — ferrous (iron ore, manganese), non-ferrous (bauxite, copper, mica), and energy minerals (coal, petroleum, natural gas). Minerals occur in veins, beds, placer deposits, and ocean water. Conventional energy sources are finite and polluting. Non-conventional sources (solar, wind, nuclear, biogas, tidal, geothermal) are cleaner and sustainable. Conservation through judicious use, recycling, and technology improvement is essential.
Important Terms
- Mineral
- Naturally occurring homogeneous substance with a definable chemical composition
- Ore
- Rock from which minerals can be extracted profitably
- Magnetite
- Best quality iron ore with up to 70% iron content
- Haematite
- Most important industrial iron ore with 50-60% iron content
- Lignite
- Low-grade brown coal with low carbon content
- Mumbai High
- India's largest offshore petroleum-producing area
- Monazite
- Mineral sand containing thorium, found in Kerala beaches
Quick Revision
- Iron ore: Odisha (largest reserves), Jharkhand, Chhattisgarh, Karnataka
- Coal: Jharia (largest), Raniganj, Bokaro — found in Gondwana rocks
- Petroleum: Mumbai High (63%), Gujarat, Assam (Digboi = oldest)
- Mica: India = leading producer; Koderma-Gaya-Hazaribagh belt (Jharkhand)
- Nuclear: Tarapur, Rawatbhata, Kalpakkam, Narora, Kakrapar, Kaiga
- Wind energy: largest cluster at Nagercoil-Madurai (Tamil Nadu)
- Minerals are non-renewable — conservation is essential
Practice Tips
- Mark major mineral deposits, coalfields, oilfields, and power stations on a map of India
- Compare conventional vs. non-conventional energy in a table
- Know specific locations for map-based questions — very important for board exams