Introduction to Minerals and Energy Resources

Minerals and energy resources form the basic foundation of modern industrial and economic development. Every house, road, bridge, vehicle, machine and electronic gadget that we use daily has been made with the help of minerals and powered by some form of energy. For a large and developing country like India, understanding the distribution, use and conservation of minerals and energy resources is extremely important.

This chapter from Geography – Contemporary India – II aims to make Class 10 students aware of different types of minerals, their mode of occurrence, major producing areas and the need to use them judiciously. It also explains conventional and non-conventional sources of energy and highlights why conservation of energy is necessary for sustainable development. These revision notes are prepared strictly according to the NCERT syllabus, making them highly useful for CBSE Class 10 Board Examination preparation.

What is a Mineral?

A mineral is a naturally occurring substance having a definite chemical composition and an orderly atomic structure. Minerals are usually found in the earth’s crust and are formed by geological processes over millions of years.

Characteristics of Minerals

• They are naturally occurring – not manufactured in factories.
• They have a definite chemical composition, e.g., iron ore, bauxite, mica.
• They possess a specific physical structure – crystalline form, colour, hardness, lustre.
• They are usually found in solid state (some may be liquid or gas, like petroleum and natural gas).
• They are non-renewable resources on the human time scale.

Mode of Occurrence of Minerals

Minerals do not occur in the same way everywhere. The places where minerals are found and the form in which they occur are called their mode of occurrence. Minerals are usually found in ores. An ore is a rock from which a mineral can be profitably extracted.

Major Modes of Occurrence

1. In igneous and metamorphic rocks:
   Minerals may occur in cracks, crevices, faults or joints. The smaller veins and the larger lodes are usually formed when minerals are deposited in these cracks by cooling magma. Metallic minerals like tin, copper, zinc and lead often occur in this manner.
2. In sedimentary rocks:
   In sedimentary rocks, minerals occur in beds or layers. These deposits have been formed due to accumulation, compaction and cementation of sediments over long periods. Examples include coal and some forms of iron ore and limestone.
3. As alluvial deposits:
   Minerals such as gold, tin and platinum may be found in the sands of valley floors and river beds. These are known as placer deposits. They are usually mined by dredging or panning.
4. As residual or surface deposits:
   When surface rocks are weathered, soluble materials are removed, and insoluble minerals remain. Bauxite, the ore of aluminium, is often found in this way in lateritic soils.
5. As evaporative deposits:
   In arid regions, evaporation of lake water may leave behind layers of salts (evaporites) such as sodium chloride and gypsum.

Where Are These Minerals Found? (Mineral Belts of India)

Minerals in India are not distributed evenly. They are mainly concentrated in certain well-known mineral belts. Broadly, four major regions are:

• North-Eastern Plateau Region – including Chhota Nagpur plateau (Jharkhand, Odisha, Chhattisgarh, West Bengal); rich in coal, iron ore, manganese, bauxite and mica.
• South-Western Plateau Region – parts of Karnataka, Goa and the Western Ghats; important for iron ore, manganese and bauxite.
• North-Western Region – Rajasthan and Gujarat; known for non-metallic minerals like limestone, gypsum, mica, salt and some copper deposits.
• Himalayan Region – minor deposits of copper, lead, zinc and gold in Jammu & Kashmir, Himachal Pradesh and Uttarakhand.

Types of Minerals

Minerals can be broadly classified into ferrous, non-ferrous and non-metallic minerals. Rock minerals such as limestone and granite are also significant for construction and industry.

1. Ferrous Minerals

Ferrous minerals contain iron. They are the backbone of the industrial sector as iron and steel are required for building machines, tools, vehicles and infrastructure.

• Iron Ore – The most important ferrous mineral; major types include hematite and magnetite.
• Manganese – Used in the manufacture of steel and in bleaching powder, paints etc.
• Chromite – Used for making stainless steel and special types of alloys.

2. Non-Ferrous Minerals

Non-ferrous minerals do not contain iron. They are important for electrical, transport and other industries.

• Copper – A good conductor of electricity; used in electrical wires, cables and machinery.
• Bauxite – The ore of aluminium; used in aircraft, automobiles, utensils and construction.
• Lead, zinc and tin – Used in alloys, galvanising and various industries.

3. Non-Metallic Minerals and Rock Minerals

Non-metallic minerals do not contain metals. They are important as raw materials for many industries.

• Mica – Used in electrical and electronic industries due to its insulating properties.
• Limestone – A basic raw material for cement industry; also used in smelting iron ore.
• Rock minerals like granite, basalt and sandstone are widely used in construction, road making and as building stones.

Conservation of Minerals

Minerals are finite and non-renewable resources. They have taken millions of years to form, but over-extraction, wastage and careless use can exhaust them quickly. Therefore, conservation of minerals is essential for sustainable development.

Need for Conservation

• Mineral resources are limited and unevenly distributed.
• Many minerals are required for modern industries, transport and communication.
• Extraction and processing of minerals cause land degradation, deforestation and pollution.
• Future generations also have a right to use these resources.

Measures for Conservation

• Use minerals judiciously and avoid unnecessary wastage.
• Promote recycling of metals like copper, aluminium and iron.
• Use alternate materials wherever possible to reduce pressure on minerals.
• Improve technology so that low-grade ores can also be profitably used.
• Encourage sustainable mining practices and restore mined areas through afforestation and land reclamation.
• Follow laws and regulations related to mining and environmental protection.

Energy Resources

Energy is required for almost everything – running industries, transport, agriculture, communication and household activities. Without energy resources, economic development comes to a halt. Energy resources can be broadly divided into conventional and non-conventional sources.

Conventional Sources of Energy

Conventional sources of energy are those which have been in common use for a long time. Most of them are non-renewable, and many cause pollution.

• Coal – The most abundant fossil fuel in India. It is used in thermal power plants, industries and railways (earlier). However, coal burning produces smoke and contributes to air pollution.
• Petroleum – Often called “black gold”. It is used as fuel in transport (petrol, diesel), for running machines, and as a raw material in petrochemical industries.
• Natural Gas – Found along with petroleum deposits. It is a clean fuel and used in power generation and as domestic fuel (CNG/PNG).
• Electricity – Produced from thermal power plants (using coal, oil or gas) and from hydroelectric projects (using running water). Thermal power is a major provider of electricity in India.
• Hydel Power – Generated by using the potential energy of stored water in dams. It is a renewable and clean source once the dam is constructed, but dam projects may cause ecological and social problems.

Non-Conventional Sources of Energy

Non-conventional sources of energy are relatively new, renewable and usually less polluting. They are crucial for long-term energy security and environmental protection.

• Solar Energy – Obtained from the sun using solar panels and solar cookers. India has huge potential for solar energy due to its tropical location.
• Wind Energy – Produced by using wind turbines. Coastal areas and open plains are suitable for setting up wind farms.
• Biogas – Generated from the decomposition of organic waste such as animal dung, agricultural residues and kitchen waste. It is a clean fuel for rural households.
• Tidal and Wave Energy – Generated from the movement of sea tides and waves in coastal regions.
• Geothermal Energy – Produced by using the heat from the interior of the earth.

Conservation of Energy Resources

With rising population and rapid industrialisation, demand for energy is increasing every year. However, many conventional energy resources such as coal, petroleum and natural gas are limited and non-renewable. Their excessive use also leads to environmental problems. Therefore, it is necessary to conserve energy resources and promote sustainable energy use.

Why Should We Conserve Energy?

• To save non-renewable resources like coal and petroleum for future generations.
• To reduce air pollution caused by burning fossil fuels.
• To lower the impact of climate change and global warming.
• To decrease import dependence and save foreign exchange.
• To encourage the use of clean and renewable energy sources.

Methods of Conserving Energy

• Use energy-efficient appliances such as LED bulbs, star-rated devices and fuel-efficient vehicles.
• Switch off lights, fans and other electrical gadgets when not in use.
• Promote public transport, car-pooling, cycling and walking instead of private vehicles.
• Encourage the use of non-conventional energy sources like solar heaters, solar lights and biogas plants.
• Improve the efficiency of thermal power plants and transmission networks to reduce energy losses.
• Create public awareness about the importance of saving energy through campaigns and education.

Summary for Quick Revision

• Minerals are naturally occurring substances with a definite chemical composition and physical properties.
• They occur in different forms – in igneous and metamorphic rocks, sedimentary beds, placer deposits, residual deposits and evaporites.
• India’s minerals are mainly distributed in the North-Eastern plateau region, South-Western plateau region, North-Western region and Himalayan belt.
• Ferrous minerals (iron ore, manganese) contain iron; non-ferrous minerals (copper, bauxite) do not contain iron; non-metallic minerals (mica, limestone) and rock minerals are important for many industries.
• Mineral resources are finite and non-renewable. Conservation through judicious use, recycling and better technology is essential.
• Energy resources are broadly divided into conventional (coal, petroleum, natural gas, thermal and hydel power) and non-conventional (solar, wind, biogas, tidal, geothermal) sources.
• Non-conventional energy sources are renewable, eco-friendly and vital for sustainable development.
• Conservation of energy resources is necessary to protect the environment, ensure energy security and safeguard interests of future generations.

These revision notes on “Geography – Contemporary India – II Chapter 5: Minerals and Energy Resources” have been prepared strictly according to the NCERT textbook and CBSE Class 10 syllabus. Students should combine this study module with NCERT reading, maps and previous years’ questions to score high marks in the CBSE Board Examinations.