Geography: Minerals and Energy Resources

The One Thing

Minerals and energy resources are essential foundations of industrial, agricultural, transport and domestic development, but their uneven distribution, finite availability and environmental costs require careful management. India therefore needs efficient extraction and use, recycling, environmental protection and an increasing shift towards renewable energy.

Who and What

• Mineral: A naturally occurring substance with a definite internal structure and chemical composition. Minerals are essential raw materials for industries and daily life.
• Ore: A mineral or rock from which a useful metal can be extracted profitably.
• Metallic minerals: Minerals containing metals, including iron ore, manganese, copper and bauxite.
• Ferrous minerals: Metallic minerals containing iron, including iron ore, manganese and chromite.
• Non-ferrous minerals: Metallic minerals without iron, including copper, bauxite, lead, zinc and gold.
• Non-metallic minerals: Minerals without metals, including mica, limestone and gypsum.
• Mining: The extraction of minerals from the Earth.
• Open-cast mining: Extraction of minerals by removing the soil and rocks above a deposit.
• Shaft mining: Extraction through deep vertical passages reaching minerals below the surface.
• Drilling: Extraction of petroleum and natural gas from underground or underwater deposits.
• Mineral belts: Regions in which particular minerals are concentrated because of shared geological conditions.
• Iron ore: A basic mineral for the iron and steel industry. Its major varieties are magnetite and hematite. Magnetite is the finest iron ore because of its very high iron content, whereas hematite is the most important industrial iron ore in India.
• Manganese: A mineral used mainly in steel manufacturing and also in bleaching powder, paints and insecticides.
• Bauxite: The main ore of aluminium, used in aircraft, utensils, electrical goods and construction.
• Mica: A non-metallic mineral with excellent insulating properties, used extensively in electrical and electronic industries.
• Limestone: A major raw material for cement and an important input in the iron and steel industry.
• Coal: A fossil fuel formed from buried plant material and used for electricity generation, industrial production and domestic purposes.
• Petroleum: A liquid fossil fuel found in sedimentary rocks and refined into petrol, diesel, kerosene, lubricants and petrochemicals.
• Natural gas: A gaseous fossil fuel found with petroleum or in separate fields. It is used as fuel, for electricity generation and as an industrial raw material.
• Thermal electricity: Electricity generated by burning coal, petroleum or natural gas to produce steam that turns turbines.
• Hydel electricity: Electricity generated from the energy of flowing or falling water.
• Nuclear energy: Energy released through changes in atomic nuclei, commonly using uranium or thorium.
• Renewable resources: Resources that can be naturally replenished, including solar, wind, tidal, biogas and geothermal energy.
• Non-renewable resources: Resources available in limited quantities and formed over millions of years, including coal, petroleum, natural gas and most minerals.
• Conservation: The careful and planned use of resources to reduce waste and ensure availability for future generations.

Minerals occur in veins and lodes in igneous and metamorphic rocks, as layers or beds in sedimentary rocks, as alluvial deposits in river valleys, and as oceanic deposits.

Important mineral distributions include:

• Iron ore: The Odisha-Jharkhand belt; Durg-Bastar-Chandrapur belt; Bellary-Chitradurga-Chikkamagaluru-Tumakuru belt; and Maharashtra-Goa belt.
• Manganese: Odisha, Karnataka, Madhya Pradesh, Maharashtra, Andhra Pradesh and Goa.
• Bauxite: Odisha, Gujarat, Jharkhand, Maharashtra, Chhattisgarh, Madhya Pradesh and Tamil Nadu; Odisha is a leading producing state.
• Mica: The Koderma-Gaya-Hazaribagh belt of Jharkhand, the Ajmer area of Rajasthan, and parts of Andhra Pradesh and Telangana.
• Limestone: Rajasthan, Madhya Pradesh, Andhra Pradesh, Gujarat, Chhattisgarh, Tamil Nadu and Karnataka.
• Coal: The Damodar, Son, Mahanadi and Godavari valleys. Important coalfields include Raniganj, Jharia, Bokaro, Talcher, Korba, Singrauli and Singareni.
• Petroleum: Mumbai High, Gujarat and Assam, with additional production in the Krishna-Godavari and Cauvery basins.
• Natural gas: The Krishna-Godavari basin, Mumbai High, Gujarat, Assam and the Tripura region.

Coal is classified according to the degree of compression and heat into peat, lignite, bituminous and anthracite. Indian coal is mostly Gondwana coal and is largely bituminous. Lignite, or brown coal, occurs notably at Neyveli in Tamil Nadu and is used mainly for thermal power generation.

Coal, petroleum and natural gas are fossil fuels formed from the remains of plants and animals over millions of years. Petroleum is mainly found in anticlines and fault traps within sedimentary rock formations. Natural gas occurs either with petroleum or in separate gas fields.

Thermal power is produced by burning fossil fuels. Hydel power is produced from water stored in dams or flowing through rivers. Important multipurpose hydel projects include Bhakra Nangal, Tehri, Nagarjuna Sagar, Hirakud, Sardar Sarovar and Damodar Valley.

Nuclear power uses uranium and thorium. Uranium occurs in areas including Jharkhand and Rajasthan, while monazite sands along the Kerala coast contain thorium. India’s major nuclear power stations are Tarapur, Rawatbhata, Kalpakkam, Narora, Kakrapar and Kudankulam.

Renewable energy sources include solar, wind, tidal, wave, geothermal and biogas energy. Important wind-energy potential exists in Tamil Nadu, Gujarat, Maharashtra, Karnataka, Rajasthan, Andhra Pradesh, Telangana and Kerala. Solar energy is particularly useful in Rajasthan, Gujarat and parts of the Deccan Plateau. Biogas is produced by decomposing animal and plant waste in airtight digesters; it provides fuel and nutrient-rich manure.

A useful classification distinguishes conventional sources—coal, petroleum, natural gas, firewood and hydel power—from non-conventional sources—solar, wind, tidal, geothermal, biogas and nuclear energy.

Causes and Consequences

• Geological structure determines mineral distribution. Differences in rock type, pressure, temperature, geological processes and the time available for formation produce uneven mineral belts. Consequently, no single region can supply every mineral equally.

• Different geological settings produce different forms of mineral occurrence. Minerals occur in veins and lodes in igneous and metamorphic rocks, in layers or beds in sedimentary rocks, in alluvial deposits in river valleys and in oceanic deposits. This determines the location and method of extraction.

• The extraction method depends on the depth and position of deposits. Open-cast mining removes the layers above a deposit, shaft mining reaches deep deposits through vertical passages, and drilling is used for underground or underwater petroleum and natural gas.

• Minerals support industrial production. Iron ore supports the iron and steel industry; manganese is used in steel manufacturing, bleaching powder, paints and insecticides; bauxite supplies aluminium for aircraft, utensils, electrical goods and construction; mica supports electrical and electronic industries; and limestone is used in cement and iron and steel production.

• Coal, petroleum and natural gas support economic development but are finite. They provide energy for industries, transport, agriculture, communication and households, but they form over millions of years and cannot be replenished on a human timescale.

• Coal type reflects the degree of compression and heat. The sequence peat, lignite, bituminous and anthracite represents increasing degrees of coal formation. India’s mainly Gondwana, largely bituminous coal supports electricity generation and industrial activity, while Neyveli lignite is used mainly for thermal power.

• Petroleum and natural gas occur in particular sedimentary structures. Petroleum is concentrated in anticlines and fault traps, while natural gas may occur with petroleum or separately. This explains the importance of Mumbai High, Gujarat, Assam, the Krishna-Godavari basin, the Cauvery basin and the Tripura region.

• Energy conversion produces different forms of electricity. Thermal electricity burns coal, petroleum or natural gas to produce steam and turn turbines. Hydel electricity uses water stored in dams or flowing through rivers. Major hydel projects include Bhakra Nangal, Tehri, Nagarjuna Sagar, Hirakud, Sardar Sarovar and Damodar Valley.

• Nuclear energy extends the energy base beyond fossil fuels. Uranium deposits in Jharkhand and Rajasthan and thorium-bearing monazite sands along the Kerala coast support nuclear generation at Tarapur, Rawatbhata, Kalpakkam, Narora, Kakrapar and Kudankulam.

• Renewable energy reduces dependence on fossil fuels. Solar, wind, tidal, wave, geothermal and biogas resources are naturally replenished and generally cause less pollution. Wind potential is significant in Tamil Nadu, Gujarat, Maharashtra, Karnataka, Rajasthan, Andhra Pradesh, Telangana and Kerala, while solar energy is especially suitable for Rajasthan, Gujarat and parts of the Deccan Plateau.

• Biogas links energy production with waste management. The decomposition of animal and plant waste in airtight digesters produces fuel and nutrient-rich manure, reducing waste and providing a useful agricultural by-product.

• Mining and energy development can damage environments and communities. Mineral extraction may cause land degradation, deforestation, soil erosion, air and water pollution, noise and health problems for mine workers and nearby communities. Development projects therefore require land restoration, pollution control, worker safety and protection of local communities.

• Conservation is necessary because resources are limited or slow to form. Appropriate measures include careful use, improved mining technology, reduced wastage, recycling metals, reusing materials, using substitutes and promoting renewable energy. Responsibility rests with individuals, industries and governments through consumption practices, planning, technology and regulation.

• Map work links resource distribution with economic geography. Students should locate major iron ore belts, coalfields, oilfields, nuclear power stations, and important thermal and hydel power plants on an outline map of India.

What Gets Asked

• Explain why minerals are unevenly distributed in India, referring to geological structure, rock types, pressure, temperature and time.
• Compare metallic, ferrous, non-ferrous and non-metallic minerals, using iron ore, manganese, chromite, copper, bauxite, mica, limestone and gypsum as examples.
• Distinguish magnetite from hematite and explain the locations and industrial importance of India’s major iron ore belts.
• Compare coal, petroleum and natural gas in terms of formation, occurrence, uses, major producing regions and their classification as non-renewable fossil fuels.
• Distinguish thermal electricity, hydel electricity, nuclear energy and renewable energy, including the relevant projects, power stations and geographical regions.
• Evaluate the environmental consequences of mining and explain how conservation, recycling, improved technology, pollution control and renewable energy can support development without exhausting resources.