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Every NCERT book that matters for UPSC — open a book, then a chapter. Learn each chapter's concepts, then how UPSC tests them — with diagrams, flowcharts and the past questions to attempt.
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← Contemporary India – II — all chaptersMinerals and Energy Resources
Start here: why this chapter matters
In simple wordsLook around your kitchen: the steel spoon, the aluminium pressure cooker, the copper wire behind the switch, the glass, the cement of the floor, the gas in the cylinder. Each began as a rock or a fuel dug out of the earth. This chapter asks two questions: where in India do these come from, and how long can they last?
This is Chapter 5 of Contemporary India – II: 16 pages (42–57). Its parts: what minerals are and how they occur (with a classification chart, Fig. 5.1, and a box on rat-hole mining); ferrous, non-ferrous and non-metallic minerals (iron ore, manganese, copper, bauxite, mica, limestone — three pie charts of state shares for 2018–19 and a full-page map); the hazards of mining (a newspaper page) and the conservation of minerals; and energy resources — coal, petroleum, natural gas and electricity (a map of coal, oil and gas with the HVJ pipeline and a map of power plants), then nuclear, solar, wind, biogas, tidal and geothermal energy, and energy conservation. It has eleven ‘Dig a little deeper’ prompts and activities, a crossword and an exercise of 4 MCQs, 4 short and 2 long questions. Every number is recomputed; our additions are marked †. Because the chapter covers two big themes, we use ten concept sections.
- Builds on jess101 (resources: renewable and non-renewable, resource planning), jess103 (multi-purpose dams that produce hydel power) and kegy205 (weathering — the process that leaves bauxite behind) and kegy203 (intrusive igneous bodies — dykes and sills — where veins and lodes form); the Gondwana rocks and the peninsular plateau are in kegy102.
- Goes further in legy205 (Mineral and Energy Resources, Class 12: mineral belts, the coal and oil fields in detail, shale gas, coal-bed methane, nuclear power stations, conservation) and legy105 (secondary activities). Leads into jess106 (manufacturing: why steel plants sit near coal and iron ore) and jess107 (pipelines as transport).
- Economics: jess201 uses crude oil reserves as its example of development that may not be sustainable; keec107 (Environment and Sustainable Development) has the energy and pollution debate.
- UPSC, honestly: Prelims has asked this chapter's basics again and again — bauxite gives aluminium (1980, 1983), coal ranks (1989, 1999), Neyveli lignite (1985, 1993), monazite and thorium (1991, 1994, 2009), Damodar coalfields (1990), Assam oil fields (1990), Koderma mica (1984, 2013), conventional vs non-conventional energy (1987, 1988), Gondwana coal (2010) and miners' lung disease (2005). Mains GS1/GS3 asks about coal mining versus the environment (2017), solar energy (2020 twice, 2025), wind (2022), mining as an environmental hazard (2025), atomic minerals (2013), energy security (2026) and mining's small share of GDP (2021). We link 33; most also sit on legy205, and policy-heavy items (shale gas, coal-bed methane, green energy corridor, the nuclear debate, renewable targets) stay there.
| Word | What it means here |
|---|---|
| Mineral | A homogeneous, naturally occurring substance with a definable internal structure |
| Rock | A combination of minerals — one (limestone) or, usually, several |
| Ore | An accumulation of a mineral mixed with other elements, rich enough to be mined at a profit |
| Vein / lode | Mineral filling a crack, fault or joint in igneous or metamorphic rock — small = vein, large = lode |
| Placer deposit | Grains of heavy, water-resistant minerals (gold, tin…) left in the sands of valley floors |
| Ferrous / non-ferrous | Metallic minerals that contain iron (iron ore, manganese) / that do not (copper, bauxite) |
| Reserve → mine | A deposit becomes a mine once its grade, ease of extraction and closeness to market make it worth working |
| Anticline | An upfold (arch) of rock layers; oil and gas collect in its crest |
| Conventional energy | Long-used sources: firewood, dung cake, coal, petroleum, natural gas, hydel and thermal electricity |
| Non-conventional energy | Newer sources: solar, wind, tidal, geothermal, biogas and (in this book) atomic energy |
| Thermal power | Electricity from burning coal, petroleum or natural gas to drive turbines |
| Hydel power | Electricity from fast-flowing water driving turbines |
| Geothermal gradient | The rate at which the earth gets hotter with depth |
| Nodal industry | An industry that feeds many others — e.g. a refinery supplying synthetic textile, fertiliser and chemical plants |
Reading the chapter opening — the Haban story and two boxes (page 42)
- Opening drawing: a miner in a helmet and boots holding a lump of ore, beside the chapter number (he reappears in the page corners). The point: minerals reach us through someone's labour underground.
- Haban's story: a boy from a remote village visits Guwahati, sees buses and a train (‘a kitchen dragging houses’), and asks why his house can't move; his father explains that these are made of metals such as iron and aluminium and run on engines that need energy. The point: the chapter's two halves — minerals and energy — in one scene.
- Box ‘A bright smile from toothpaste and minerals’: abrasives (silica, limestone, aluminium oxide, phosphates), fluoride from fluorite, white titanium oxide from rutile, ilmenite and anatase, sparkle from mica, and a tube and brush of petroleum plastics. The point: even a tiny daily item is a bundle of minerals.
- Box ‘All living things need minerals’: minerals are only about 0.3% of our nutrient intake but let us use the other 99.7%. The point: minerals are part of life itself, not just industry.
- Two ‘Dig a little deeper’ prompts (minerals in a light bulb; nutrition labels) and the question ‘why are minerals so varied?’ — outlines in the in-text section. (A QR code links to NCERT's e-content.)
At a glance — the six ideas to carry away
- Mineral = ‘homogeneous, naturally occurring substance with a definable internal structure’. Found in ores; the setting decides the cost of mining.
- Five settings: veins/lodes (tin, copper, zinc, lead) · beds (coal; gypsum, potash, salt) · residual (bauxite) · placer (gold, silver, tin, platinum) · ocean (salt, magnesium, bromine; manganese nodules).
- Iron ore: magnetite (up to 70% Fe, finest) and hematite (most used); 97% from Odisha, Chhattisgarh, Karnataka, Jharkhand (2018–19). Belts: Odisha–Jharkhand, Durg–Bastar–Chandrapur, Ballari–Chitradurga–Chikkamagaluru–Tumakuru, Maharashtra–Goa.
- Manganese: ≈ 10 kg per tonne of steel; MP 33%, Maharashtra 27%. Copper: Balaghat, Khetri, Singhbhum. Bauxite: Odisha 65% (Panchpatmali, Koraput). Mica: Koderma–Gaya–Hazaribagh. Limestone: cement and blast furnaces.
- Coal: peat → lignite (Neyveli) → bituminous → anthracite; Gondwana (Damodar valley: Jharia, Raniganj, Bokaro) and Tertiary (north-east). Oil in anticlines and fault traps; Mumbai High, Ankaleshwar, Digboi. HVJ: 1,700 km gas pipeline.
- Non-conventional: nuclear (uranium, thorium; monazite of Kerala), solar, wind (Nagercoil–Madurai, Jaisalmer), biogas, tidal (Khambhat, Kachchh, Sundarbans), geothermal (Manikaran, Puga). ‘Energy saved is energy produced’.
1. What a mineral is, and how minerals are grouped
In simple wordsThink of a fruit salad and a single apple. A rock is the salad — a mix of several ingredients; a mineral is one ingredient, the same all the way through. Some ‘salads’ (limestone) have only one fruit; most have several.
Geologists define a mineral as a ‘homogenous, naturally occurring substance with a definable internal structure’. Minerals range from the hardest, diamond, to the softest, talc. Rocks are combinations of minerals: a few (such as limestone) are made of one mineral, most of several. Over 2,000 minerals have been identified (NCERT), but only a few are abundant in most rocks. Which mineral forms depends on the physical and chemical conditions, which give each its colour, hardness, crystal form, lustre and density — the properties geologists use to classify them. Geographers study minerals for landforms and for the distribution of resources and the economic activities around them; geologists study their formation, age and composition.
Reading the box ‘Study of Minerals by Geographers and Geologists’ and Fig. 5.1 ‘Classification of Minerals’ (page 43)
- Box: the geographer–geologist contrast above. The point: this chapter looks at minerals the geographer's way — where they are and what people do with them.
- Fig. 5.1: a tree chart. Minerals branch into metallic, non-metallic and energy minerals; metallic branches into ferrous (iron ore, manganese, nickel, cobalt), non-ferrous (copper, lead, tin, bauxite) and precious (gold, silver, platinum); non-metallic examples are mica, salt, potash, sulphur, granite, limestone, marble and sandstone; energy minerals are coal, petroleum and natural gas. The point: grouping by use — a reader can place any new mineral. (Our diagram uses its own layout and adds the exam twists.)
NCERT details to read carefully — definitions and counts
- ‘Over 2,000 minerals have been identified’ is an old figure. Beyond NCERT: the International Mineralogical Association now recognises more than 5,000 mineral species. Safe line: ‘thousands of minerals are known, but only a few are common in rocks’.
- ‘Limestone consists of a single mineral’ is NCERT's simplification: limestone is mostly calcite (calcium carbonate); with magnesium it grades into dolomite, as the book itself says later.
- Fig. 5.1 puts manganese, nickel and cobalt under ferrous — because they are alloyed with iron in steel — and bauxite under non-ferrous. Gypsum, mica and limestone are non-metallic (UPSC 1988 asked for the non-metallic one: gypsum).
2. Where minerals occur — and why India's are uneven
In simple wordsMoney can be in a locked safe, in a pile of coins on a shelf, in loose change left in the sofa, or as specks of gold dust in a river. How easily you can collect it — and what it costs — depends on where it is lying. Minerals are the same.
Minerals are usually found in ores — accumulations of a mineral mixed with other elements. The ore must be concentrated enough to be commercially viable, and the type of formation decides how easily — and at what cost — it can be mined. NCERT's five settings:
- (i) Igneous and metamorphic rocks: minerals fill cracks, crevices, faults or joints — smaller ones are veins, larger ones lodes — formed when molten or gaseous material is forced upward and cools as it rises. Tin, copper, zinc and lead come from veins and lodes.
- (ii) Sedimentary rocks: minerals lie in beds or layers, formed by deposition and concentration in horizontal strata. Coal and some forms of iron ore were concentrated under long heat and pressure; gypsum, potash salt and sodium salt formed by evaporation, especially in arid regions.
- (iii) Residual weathered mass: surface rocks decompose and their soluble parts are removed, leaving a residue rich in ore — bauxite forms this way.
- (iv) Placer deposits: alluvial deposits in the sands of valley floors and at the base of hills, of minerals not corroded by water — gold, silver, tin and platinum.
- (v) Oceans: sea water holds vast quantities of minerals, mostly too diffused to be economic, but common salt, magnesium and bromine are largely got from it; ocean beds are rich in manganese nodules.
India's distribution is rich and varied but uneven. Broadly, the peninsular rocks hold most of the coal, metallic minerals, mica and many non-metallic minerals; sedimentary rocks on the western and eastern flanks of the peninsula, in Gujarat and Assam, hold most of the petroleum; Rajasthan, with the peninsula's rock systems, has many non-ferrous minerals; and the vast alluvial plains of north India are almost devoid of economic minerals. The differences come from geological structure, processes and time. Grade, ease of extraction and closeness to market decide whether a deposit or reserve becomes a mine.
⤵ From a deposit to a mine (NCERT's three tests)
A deposit existsa mineral concentrated in some rock setting
Concentrationis the ore rich enough?
Ease of extractionvein, bed, placer or deep seam?
Closeness to markethow far must the ore travel?
Choose among optionsdemand is met from the most viable reserves first
The reserve becomes a mineopen pit, quarry or underground shafts
Reading the box ‘Interesting Fact — Rat-Hole Mining’ and the prompt (page 44)
- Box: most minerals in India are nationalised and can be mined only with government permission, but in most tribal areas of the north-east minerals are owned by individuals or communities. Meghalaya has large deposits of coal, iron ore, limestone and dolomite; in Jowai and Cherrapunjee coal is dug by family members through long, narrow tunnels — ‘rat-hole’ mining. The National Green Tribunal declared it illegal and asked that it stop at once. The point: who owns minerals, and how unsafe small-scale mining can be.
- Dig a little deeper: the difference between an open-pit mine, a quarry and an underground mine with shafts. Outline in the in-text section.
NCERT details to read carefully — occurrence
- Veins and lodes are in igneous and metamorphic rocks; beds and layers are in sedimentary rocks (exercise 1(iii) → sedimentary).
- Bauxite is the residual-weathering mineral (exercise 1(i)) — not coal, gold or zinc.
- Tin appears twice: in veins/lodes and in placers — both are right.
- Gold and copper ‘mostly in old igneous rocks’ was UPSC 1992's key; Indian gold (Kolar, Hutti) actually lies in old metamorphic schists, so the key is debatable. Strategy: tie metals to veins and lodes in igneous and metamorphic rocks, and if forced to choose, follow the official key.
- The NGT's ban on rat-hole mining dates from April 2014 (Beyond NCERT); the book gives no year.
3. Ferrous minerals: iron ore and manganese
In simple wordsIron ore is to a steel plant what flour is to a bakery — the bulk ingredient. Manganese is the pinch of salt: only about 10 kg goes into a tonne of steel, yet you cannot make good steel without it.
Ferrous minerals make up about three-fourths of the value of India's metallic mineral production (undated in the book) and give a strong base to metallurgical industries; India exports substantial amounts after meeting home demand. Iron ore is ‘the basic mineral and the backbone of industrial development’. Magnetite is the finest ore, up to 70% iron, with excellent magnetic qualities valued in the electrical industry; hematite is the most important industrial ore by quantity used, with slightly less iron (50–60%). In 2018–19, 97% of iron ore came from Odisha, Chhattisgarh, Karnataka and Jharkhand.
| Iron ore belt (NCERT) | States | Mines and facts |
|---|---|---|
| Odisha–Jharkhand | Odisha, Jharkhand | high-grade hematite at Badampahar (Mayurbhanj and Kendujhar districts); Gua and Noamundi in Singhbhum (Jharkhand) |
| Durg–Bastar–Chandrapur | Chhattisgarh, Maharashtra | Bailadila hills (Bastar † now Dantewada): 14 deposits of super-high-grade hematite, best for steel; exported to Japan and South Korea via Visakhapatnam |
| Ballari–Chitradurga–Chikkamagaluru–Tumakuru | Karnataka | large reserves; Kudremukh in the Western Ghats — a 100% export unit, among the world's largest deposits; ore sent as slurry by pipeline to a port near Mangaluru (see trap box: stale) |
| Maharashtra–Goa | Goa, Ratnagiri district (Maharashtra) | ores not of very high quality but efficiently worked; exported through Mormugao (‘Marmagao’) |
Manganese is used mainly in making steel and ferro-manganese alloy — nearly 10 kg per tonne of steel, that is about 1% by weight (our arithmetic) — and in bleaching powder, insecticides and paints. In 2018–19 Madhya Pradesh (33%) and Maharashtra (27%) together produced 60% (Fig. 5.3; chart in the next section).
Reading Fig. 5.2 ‘Iron ore mine’, the Kudremukh–Bailadila box, Fig. 5.3 and the prompt (pages 44–45)
- Fig. 5.2: an open-cast iron ore mine — red-brown benches cut in steps down a hillside, a haul road zigzagging across them and a pool of green-blue water at the bottom. The point: iron ore is mostly mined in huge open pits, which strip the land.
- ‘Do you know?’ box: Kudre means horse in Kannada — the highest peak of the Karnataka Western Ghats looks like a horse's face; the Bailadila hills look like the hump of an ox (baila), hence the name. The point: place names carry landform clues.
- Fig. 5.3 ‘Production of Manganese showing state-wise share in per cent, 2018–19’: a pie chart — Madhya Pradesh 33, Maharashtra 27, Odisha 16, Karnataka 12, Andhra Pradesh 10, others 2. The point: manganese is concentrated in central India. Redrawn as bars in the next section.
- Dig a little deeper: superimpose the maps of iron ore, manganese, coal and the iron and steel industry — is there a correlation, and why? Outline in the in-text section.
NCERT details to read carefully — iron ore
- Kudremukh is stale: mining there stopped at the end of 2005 after a Supreme Court order (2002), because the mine lay in the Kudremukh National Park; the slurry pipeline now serves KIOCL's pellet plant at Mangaluru (Beyond NCERT — verify). Safe line: ‘Kudremukh was a 100% export-oriented mine, closed in 2005’.
- Pure magnetite is 72.4% iron and pure hematite 69.9% (our arithmetic from atomic masses) — so ‘magnetite finest, hematite most used’ is the point, not a big gap in richness. Indian high-grade hematite commonly runs above 60%.
- ‘Hematite’ and ‘haematite’ are the same word; the book uses both.
- Bailadila is in the Dantewada district today (carved out of Bastar, Beyond NCERT); the book's ‘Bastar district’ is the old name.
- The ‘three-fourths of value’ and ‘97% from four states’ figures belong to different contexts — the first is undated, the second is 2018–19. Quote each with its year.
4. Non-ferrous and non-metallic minerals: copper, bauxite, mica, limestone
In simple wordsCopper is the wiring of the house, aluminium the window frames and the cooker, mica the tiny insulating sheet inside the iron, and limestone the cement in the walls. None of them is iron, yet a modern home cannot do without any of them.
India's reserves and production of non-ferrous minerals — copper, bauxite, lead, zinc, gold — are not very satisfactory, yet they are vital to metallurgical, engineering and electrical industries. Copper: India is critically deficient; being malleable, ductile and a good conductor, it goes into electrical cables, electronics and chemical industries; the Balaghat mines (Madhya Pradesh), Khetri (Rajasthan) and Singhbhum district (Jharkhand) lead. Bauxite: a clay-like substance from which alumina and then aluminium are obtained; it forms by the decomposition of rocks rich in aluminium silicates. Aluminium matters because it combines the strength of metals like iron with extreme lightness, good conductivity and great malleability. Deposits lie on the Amarkantak plateau, the Maikal hills and the Bilaspur–Katni plateau; Odisha was the largest producer in 2018–19, with the Panchpatmali deposits of Koraput the most important.
Mica (non-metallic) is made of plates or leaves that split into sheets so thin that a thousand make a stack only a few centimetres high — each sheet about 0.03 mm if the stack is 3 cm (our arithmetic †). It can be clear, black, green, red, yellow or brown. Its di-electric strength, low power loss, insulating properties and resistance to high voltage make it indispensable in electric and electronic industries. It is found on the northern edge of the Chota Nagpur plateau — the Koderma–Gaya–Hazaribagh belt of Jharkhand leads — around Ajmer (Rajasthan) and in the Nellore belt (Andhra Pradesh). Limestone (a rock mineral) occurs with rocks of calcium carbonate or calcium–magnesium carbonate in sedimentary rocks of most formations; it is the basic raw material for cement and essential for smelting iron ore in the blast furnace.
| Mineral on NCERT's map (p. 46) | Places marked (state †) | Count |
|---|---|---|
| Iron ore mines | Gua (Jharkhand); Mayurbhanj, Kendujhar (Odisha); Durg, Bailadila (Chhattisgarh); Chandrapur, Ratnagiri (Maharashtra); Goa; Ballari, Chitradurga, Kudremukh, Chikkamagaluru, Tumakuru (Karnataka) | 13 |
| Iron ore exporting ports | Paradip (map: ‘Paradwip’, Odisha); Visakhapatnam (Andhra Pradesh); Mormugao (map: ‘Marmagao’, Goa); Mangaluru (Karnataka) | 4 |
| Manganese | Balaghat (Madhya Pradesh); Nagpur, Bhandara (Maharashtra); Sundergarh, Kendujhar area (Odisha); Goa; Shivamogga (Karnataka) | 7 |
| Bauxite | Katni, Amarkantak (Madhya Pradesh); Bilaspur (Chhattisgarh); Maikala hills (Madhya Pradesh–Chhattisgarh); Koraput (Odisha) | 5 |
| Mica | Ajmer, Beawar (Rajasthan); Gaya (Bihar); Hazaribagh (Jharkhand); Nellore (Andhra Pradesh) | 5 |
Reading the map ‘India: Distribution of Iron Ore, Manganese, Bauxite and Mica’ (page 46) — described in words, not redrawnA full-page outline map with latitude and longitude, the Tropic of Cancer, a scale and a legend of six symbols: hatched iron ore fields, triangles for iron ore mines, squares for iron ore exporting ports, and separate symbols for manganese, bauxite and mica. What it shows: four hatched iron ore fields — one on the Odisha–Jharkhand border (Gua, Mayurbhanj, Kendujhar), one in Chhattisgarh and eastern Maharashtra (Durg, Bailadila, Chandrapur), one along the Goa–Ratnagiri coast, and one across central Karnataka (Ballari, Chitradurga, Kudremukh, Chikkamagaluru, Tumakuru); iron ore ports on both coasts (Paradip and Visakhapatnam in the east, Mormugao and Mangaluru in the west); manganese around Nagpur–Bhandara–Balaghat, in northern Odisha, in Goa and at Shivamogga; bauxite on the Amarkantak–Maikal–Katni–Bilaspur uplands and at Koraput; and mica in three clusters — Ajmer–Beawar, Gaya–Hazaribagh, and Nellore. The point: almost everything lies on the peninsular plateau, and iron ore fields lie within reach of ports. The table above turns every symbol into a place and state.
Reading Figs 5.4–5.7 and the boxes (pages 47–48)
- Fig. 5.4 ‘Copper mines at Malanjkhand’: officials in hard hats stand at the rim of an open-cast pit while dumpers move ore below. The point: Malanjkhand (in Balaghat district, Madhya Pradesh) is India's big open-pit copper mine.
- Fig. 5.5 ‘Production of Bauxite showing state-wise share in per cent, 2018–19’: a pie — Odisha 65, Jharkhand 10, Gujarat 9, Chhattisgarh 6, Maharashtra 6, Madhya Pradesh 3, others 1. The point: one state dominates.
- Fig. 5.6 ‘Bauxite Mine’: a large excavator loading red-brown earth into a dumper, with more dumpers on a broad, flat, cleared plateau top. The point: bauxite caps flat plateau tops and is scraped off in open mines.
- Box ‘Interesting Fact’: after aluminium was discovered, Emperor Napoleon III wore aluminium buttons and served his most honoured guests on aluminium plates (lesser guests got gold and silver); thirty years later aluminium bowls were common among the beggars of Paris. The point: a metal's value falls once cheap extraction is found.
- Fig. 5.7 ‘Production of Limestone showing state-wise share in per cent, 2018–19’: a pie of ten slices — Rajasthan 22, Andhra Pradesh 13, Madhya Pradesh 13, Chhattisgarh 11, Karnataka 10, Telangana 7, Gujarat 6, Tamil Nadu 5, Maharashtra 4, others 9. The point: limestone is widespread, so cement plants are too.
- Dig a little deeper: locate bauxite mines on a physical map; explain why Chota Nagpur is a storehouse of minerals. Outlines in the in-text section.
NCERT details to read carefully — non-ferrous and non-metallic
- Koderma (Jharkhand) leads in mica — not bauxite, iron ore or copper (exercise 1(ii); UPSC 1984, 2013).
- Khetri = copper (Rajasthan); Balaghat = copper (Malanjkhand) and also manganese on the map; Majhgawan (not in the book) = diamonds (UPSC 2007, on legy205).
- Bauxite → alumina → aluminium (UPSC 1980, 1983); cryolite is used in smelting it, not mined as the common ore.
- Spellings: the book writes Singhbhum and Singbhum, Kodarma and Koderma — same places.
- Napoleon III's aluminium story is a well-known anecdote; the book gives no dates. Beyond NCERT: aluminium became cheap after the electrolytic process of 1886 (Hall and Héroult).
5. The hazards of mining, and conserving minerals
In simple wordsA family living off savings can enjoy a good life for some years — but if nothing is ever earned back, the account empties, and each withdrawal gets harder as only small coins are left. Minerals are such savings: built over millions of years, spent in decades.
Hazards of mining (NCERT's box): miners inhale dust and noxious fumes and become vulnerable to pulmonary (lung) diseases; collapsing mine roofs, inundation and fires in coal mines are constant threats. Around the mines, water sources are contaminated, and dumping of waste and slurry degrades land and soil and pollutes streams and rivers. Stricter safety regulations and enforcement of environmental laws are needed to stop mining from becoming a ‘killer industry’.
⤵ How an underground coal fire spreads (the newspaper graphic, in our words)
A fire startsoften from trash burning close to coal pits
It reaches the seamsand creeps along coal beds below the surface
Air feeds itoxygen drawn in through rock pores and mine shafts keeps unmined coal burning
Ground collapsesburnt-out pillars give way under streets and houses
Poison gascarbon monoxide and smoke rise into homes
People must movethe decision to relocate the Jharia township
Reading Fig. 5.8 and the newspaper page (pages 48–49)
- Fig. 5.8 ‘Air pollution due to generation of dust in mining areas’: a loaded truck driving along an unpaved road through a thick cloud of grey-violet dust. The point: dust is the everyday hazard of mining towns.
- Newspaper page (four reports, undated in the book): ‘Jharia to be shifted’ — the government decides to relocate the whole Jharia township because underground coal fires have burned for years; ₹14 crore sanctioned for a first phase; a panel put the cost of shifting people at ₹20,000 crore while coal worth ₹60,000 crore lies beneath (three times the cost — our arithmetic). A graphic, ‘Coal fire catastrophe’, shows the four steps in the flow above. ‘Coal unit fined Rs 300 cr in damages’ — the Supreme Court asks South Eastern Coalfields Ltd, a Coal India subsidiary, to pay ₹300 crore (₹100 crore within a week, the rest within a month) for using forest land in Chhattisgarh, on top of ₹50 crore already paid. ‘Over 50% of coal-belt mines unsafe’ — after a disaster that killed 54 people, Bharat Coking Coal Ltd's chief says only 1 of 41 mines was run scientifically and safety in 24 was poor (24 of 41 ≈ 58.5% — our arithmetic). ‘Safety standards were not in place’ — the coal minister announces ex gratia payments and an inquiry; a photograph shows a crowd watching rescue work outside the Bhatdih mine. The point: mining's costs fall on miners, residents and forests.
Conservation of minerals: industry and agriculture depend heavily on minerals, yet workable deposits are an insignificant fraction — about 1% — of the earth's crust. We are rapidly using up resources that took millions of years to form; replenishment is infinitely slow beside consumption, so minerals are finite and non-renewable — ‘valuable but short-lived possessions’. Continued extraction pushes mining deeper and to poorer grades, raising costs. The remedies: use minerals in a planned and sustainable way; evolve technologies that use low-grade ores at low cost; recycle metals; use scrap and substitutes.
⤵ Why minerals must be conserved (NCERT's chain)
Formed over millions of yearsworkable deposits are only about 1% of the crust
Used up in decadesreplenishment is infinitely slow
Deeper, poorer oreseach tonne costs more to extract
Plan useplanned and sustainable
Low-grade technologyuse poorer ores cheaply
Recycle and substitutescrap metal, other materials
Reading the prompt on substitutes (page 50)Dig a little deeper: list items where substitutes are used instead of minerals, and where those substitutes come from. The point: plastics, glass fibre and composites replace metals — but many come from petroleum, itself a mineral. Outline in the in-text section.
| Mining and the people who live on the land (Beyond NCERT attribution) | Who | Position |
|---|---|---|
| Minerals for growth and revenue | Ministry of Mines (National Mineral Policy, 2019); mining companies and state governments | minerals are the base of industry and infrastructure; auctions and royalties bring revenue; mining brings jobs to backward districts |
| Consent and rights of forest communities | Gram sabhas and tribal organisations in Scheduled Areas; rights groups citing PESA and the Forest Rights Act | land, forests and sacred sites should not be taken without informed consent; benefits rarely reach those displaced |
| Health, safety and environment | Pollution boards, the National Green Tribunal; environmental researchers | enforce safety and environmental laws, restore mined land, control dust and water pollution — NCERT's own call |
| Bare facts | Parliament; Supreme Court | Mines and Minerals (Development and Regulation) Act, 1957, amended 2015 (auctions; District Mineral Foundations for affected people); PESA Act, 1996; Forest Rights Act, 2006; Samatha judgment, 1997 (transfer of tribal land in Scheduled Areas to private miners void); Niyamgiri (Odisha) — Supreme Court, April 2013, left the decision on bauxite mining to the local gram sabhas |
Beyond NCERT — mining today, dated
- Rat-hole mining: banned by the NGT in April 2014; in December 2018 fifteen miners were trapped in a flooded rat-hole mine at Ksan, East Jaintia Hills (Meghalaya).
- Pneumoconiosis (‘black lung’ among coal miners) and silicosis are the classic dust diseases — UPSC 2005 asked which workers it afflicts (coal mining).
- The Jharia fires are usually said to date from about 1916; a Jharia Master Plan for fire control and rehabilitation was approved in 2009 — check its revisions before quoting.
- Critical minerals: the Ministry of Mines listed 30 critical minerals (lithium, cobalt, rare earths and others) in 2023; a National Critical Mineral Mission was approved in 2025.
NCERT details to read carefully — conservation
- Minerals are non-renewable because their formation is geologically slow — not because they are rare (exercise 2(iv)).
- ‘About 1% of the crust’ refers to workable deposits, not to all minerals — the whole crust is made of minerals.
- The newspaper reports are undated in the book; their details (54 dead, the Bhatdih rescue, a Chief Justice named in the bench) match 2006 (Beyond NCERT — verify before quoting a year).
6. Energy resources: conventional and non-conventional
In simple wordsYour phone can be charged from the wall socket, a power bank or a small solar panel. Old habits use the socket; newer options are the bank and the panel. India's energy is similar: ‘conventional’ sources are the ones we have long relied on, ‘non-conventional’ the newer ones we are turning to.
Energy is needed to cook, give light and heat, propel vehicles and run machines. It comes from fuel minerals — coal, petroleum, natural gas, uranium — and from electricity. NCERT's two groups: conventional — firewood, cattle dung cake, coal, petroleum, natural gas and electricity (both hydel and thermal); non-conventional — solar, wind, tidal, geothermal, biogas and atomic energy. Firewood and dung cake are most common in rural India: by one (undated) estimate they meet more than 70% of rural household energy needs, but forests are shrinking, and burning dung wastes the most valuable manure.
| NCERT's grouping | Sources | Renewable? |
|---|---|---|
| Conventional | firewood, dung cake | renewable only if forests regrow; dung is better used as manure |
| coal, petroleum, natural gas, thermal electricity | non-renewable fossil fuels | |
| hydel electricity | renewable — conventional ≠ non-renewable | |
| Non-conventional | solar, wind, tidal, geothermal, biogas | renewable |
| atomic (nuclear) | not renewable — uranium and thorium are minerals; non-conventional only in the sense of ‘newer’ |
Classification traps
- Hydel is conventional (UPSC 1987 key: hydropower) yet renewable; biogas is non-conventional (UPSC 1988).
- This book lists atomic energy as non-conventional; the Class 12 book (legy205) groups nuclear minerals with the conventional sources. In an answer, say which grouping you use; never call nuclear ‘renewable’.
- The ‘more than 70%’ rural figure is undated. Beyond NCERT: LPG reached most rural homes after the Pradhan Mantri Ujjwala Yojana (2016), though surveys still find many households using firewood as well — quote the book's figure as an old estimate.
7. Coal: India's mainstay
In simple wordsLeaves pressed in a heavy book for years become thin and dark. Bury whole swamp forests under rock for millions of years and squeeze them hard, and you get coal — the longer and deeper the squeeze, the better the coal.
Coal is India's most abundant fossil fuel and meets a substantial part of its energy needs — for power, for industry and at home; India is highly dependent on coal for commercial energy. Coal forms by the compression of plant material over millions of years, so it comes in grades: peat (decaying swamp plants — low carbon, high moisture, low heat), lignite (low-grade brown coal, soft and moist; principal reserves at Neyveli, Tamil Nadu, used for electricity), bituminous (buried deep and heated — the most popular commercial coal; its high grade, metallurgical coal, is special for smelting iron in blast furnaces) and anthracite (the highest-quality hard coal).
⤵ From swamp to anthracite (NCERT's sequence)
Swamp plants decaypeat: low carbon, high moisture
Buried and compressedlignite: soft brown coal (Neyveli)
Deeper, hotterbituminous: the common commercial coal; best grade = metallurgical
Most alteredanthracite: hardest, highest quality
Two geological ages: Gondwana coal, a little over 200 million years old, and Tertiary coal, only about 55 million years old. The major Gondwana resources — metallurgical coal — are in the Damodar valley (West Bengal–Jharkhand): Jharia, Raniganj, Bokaro; the Godavari, Mahanadi, Son and Wardha valleys also hold coal. Tertiary coal occurs in Meghalaya, Assam, Arunachal Pradesh and Nagaland. Coal is bulky and loses weight on use (it is reduced to ash), so heavy industries and thermal power stations are located on or near coalfields.
⤵ Why coal pulls industry to the coalfield
Coal is bulkycostly to carry far
It loses weight on usemuch of it ends as ash and gas
So carry the product, not the fuelbuild the plant on or near the coalfield
Resultsteel plants and thermal stations cluster in the Damodar valley, Korba, Singrauli, Talcher
| Coal mine on NCERT's map (p. 51) | State (†) | Type / basin (†) |
|---|---|---|
| Jharia | Jharkhand | Gondwana — Damodar valley |
| Bokaro | Jharkhand | Gondwana — Damodar valley |
| Raniganj | West Bengal | Gondwana — Damodar valley |
| Singrauli (map: ‘Singarauli’) | Madhya Pradesh–Uttar Pradesh | Gondwana — Son valley |
| Korba | Chhattisgarh | Gondwana — Mahanadi basin |
| Talcher | Odisha | Gondwana — Mahanadi valley |
| Singareni | Telangana | Gondwana — Godavari valley |
| Neyveli | Tamil Nadu | lignite (Tertiary †) |
| Makum | Assam | Tertiary — north-east |
| Najira (Nazira) | Assam | Tertiary — north-east (as marked) |
| Janji | Assam | Tertiary — north-east (as marked) |
Reading Figs 5.9 (a) and (b) (page 50)
- Fig. 5.9 (a) ‘A view from inside of a coal mine’: a heavy cutting machine in a low underground gallery, a miner in a helmet beside it. The point: underground (shaft) mining for deep seams.
- Fig. 5.9 (b) ‘A view from outside of a coal mine’: a vast open pit with a tall dragline crane and excavators on its benches. The point: open-cast mining for shallow seams — the commonest method in India today.
NCERT details to read carefully — coal
- ‘A little over 200 million years’ understates Gondwana's age: the coal-bearing Gondwana rocks are mostly Permian, about 250–300 million years old (Beyond NCERT). Safe line: ‘Gondwana coal, over 200 million years old; Tertiary coal, about 55 million years old’.
- Gondwana rocks hold the bulk — more than 90% — of India's coal (UPSC 2010 key); Tertiary coal is a small share. Neyveli lignite is Tertiary (UPSC 1993); Tamil Nadu leads in lignite (UPSC 1985).
- Anthracite has the most carbon and highest calorific value (UPSC 1989, 1999); India's coal is mostly bituminous with high ash (UPSC 2013, legy205).
- On the map, Najira (Nazira) and Janji in Assam carry the coal symbol; both are better known for oil (Beyond NCERT). Makum is the well-known Tertiary coalfield. Learn the map as printed, but don't over-quote those two.
Beyond NCERT — coal, dated
- Coal mines were nationalised in 1971–73 (Coal Mines (Nationalisation) Act, 1973); Coal India Ltd was formed in 1975. Commercial coal mining by auction opened in 2020.
- India's coal output crossed 1 billion tonnes for the first time in 2024–25 (about 1,048 million tonnes, Ministry of Coal); India is the world's second-largest producer after China. It still imports coking coal for steel (UPSC 2012 — legy205).
- Coal-based plants are still the largest single source of India's electricity generation — around 70–75% in recent years (Central Electricity Authority — check the latest year).
8. Petroleum and natural gas
In simple wordsTurn a bowl upside down in a tub of water with a little oil floating in it — the oil and air collect under the dome of the bowl. Rock layers bent into domes do the same with oil and gas: they rise through porous rock until a tight layer above stops them.
Petroleum is India's next major energy source after coal: fuel for heat and lighting, lubricants for machinery and raw material for many industries; refineries are a ‘nodal industry’ for synthetic textiles, fertilisers and chemicals. Most Indian petroleum is in anticlines and fault traps in rocks of Tertiary age. In an anticline or dome, oil is trapped in the crest of the upfold; the oil-bearing layer is porous limestone or sandstone, sealed above and below by non-porous layers. In a fault trap it is held between porous and non-porous rocks. Gas, being lighter, usually lies above the oil. Mumbai High, Gujarat and Assam are the main producing areas; Ankaleshwar is Gujarat's most important field; Assam is the oldest oil-producing state, with Digboi, Naharkatiya and Moran-Hugrijan.
⤵ How an oil trap fills
Oil and gas form in source rocksand, being light, move upward
They travel through porous rocklimestone or sandstone
A non-porous seal stops themcap rock over an anticline, or rock across a fault
They separate by weightgas on top, oil below, water lowest — drill the crest
Natural gas is found with petroleum and released when crude is brought up. It is a domestic and industrial fuel, a fuel for power, for heating in industry, a raw material for chemical, petrochemical and fertiliser plants, and increasingly a transport fuel (CNG) and cooking fuel (PNG) through city gas distribution networks. Major reserves: Mumbai High and allied fields along the west coast, supplemented by the Cambay basin; new finds in the Krishna–Godavari basin on the east coast. The first cross-country pipeline, the 1,700 km Hazira–Vijaipur–Jagdishpur (HVJ) built by GAIL (India), linked the Mumbai High and Bassein gas fields to fertiliser, power and industrial complexes in western and northern India. The network has grown over ten times, to 18,500 km, and is expected to exceed 34,000 km as a national Gas Grid reaching every source and market, including the North-East.
| Oil field on NCERT's map (p. 51) | Where (†) |
|---|---|
| Mumbai High | offshore, Arabian Sea (off Maharashtra) |
| Bassein (map: ‘Bassien’) | offshore, Arabian Sea (off Maharashtra) |
| Ankaleshwar (Ankleshwar) | Gujarat |
| Kalol | Gujarat |
| Digboi | Assam |
| Naharkatia | Assam |
| Moran | Assam |
| Sibsagar (Sivasagar) | Assam |
| Place served by the HVJ pipeline system on the map | State (†) |
|---|---|
| Hazira (map: ‘Hajira’) | Gujarat |
| Vadodara | Gujarat |
| Jhabua | Madhya Pradesh |
| Vijaipur | Madhya Pradesh |
| Anta | Rajasthan |
| Auraiya | Uttar Pradesh |
| Jagdishpur | Uttar Pradesh |
| Shahjahanpur | Uttar Pradesh |
| Aonla | Uttar Pradesh |
| Babrala | Uttar Pradesh |
| Sahibabad | Uttar Pradesh |
| Delhi | Delhi |
| Gurugram | Haryana |
| Sonipat | Haryana |
Reading the map ‘India: Distribution of Coal, Oil and Natural Gas’ and the activity (page 51) — described in words, not redrawnA full-page outline map with a legend of five symbols: hatched coal fields, triangles for coal mines, squares for oil fields, grey patches for major natural gas reserves, and a line for the HVJ natural gas pipeline. What it shows: coalfields sweep across the north-east of the peninsula — the Damodar valley (Jharia, Bokaro, Raniganj), Singrauli, Korba, Talcher — and down the Godavari valley (Singareni), with Neyveli's lignite in the far south and a small Tertiary cluster in upper Assam (Makum, Najira, Janji). Oil fields sit in two clusters: Gujarat (Kalol, Ankaleshwar) with Mumbai High and Bassein offshore, and upper Assam (Digboi, Naharkatia, Moran, Sibsagar). Gas reserves are shaded in western Rajasthan, the Gulf of Khambhat, offshore Mumbai, Tripura, Assam and off the Tamil Nadu coast. The pipeline starts at Hazira on the Gujarat coast, runs north-east past Jhabua and Vijaipur to Auraiya and Jagdishpur, with branches to Anta, Shahjahanpur, Aonla, Babrala and the Delhi area (Sahibabad, Gurugram, Sonipat). The point: coal is a peninsular, Gondwana story; oil and gas are a sedimentary-basin story on the flanks; pipelines carry gas to markets far inland. The tables above turn the symbols into places.
Activity: collect information about cross-country gas pipelines laid by GAIL under ‘One Nation One Grid’. Outline in the in-text section.
Activity: collect information about cross-country gas pipelines laid by GAIL under ‘One Nation One Grid’. Outline in the in-text section.
NCERT details to read carefully — oil and gas
- The book's ‘local city gas distribution (COD)’ is a misprint for CGD.
- Map spellings: ‘Hajira’ = Hazira, ‘Bassien’ = Bassein, ‘Ankeleshwar’ = Ankleshwar, ‘Najira’ = Nazira. The pipeline was first known as HBJ (Hazira–Bijaipur–Jagdishpur).
- ‘Locate the 3 major offshore fields of western India’: the map marks only two offshore oil fields (Mumbai High, Bassein) plus offshore gas in the Gulf of Khambhat; guides often add Aliabet (Gulf of Khambhat) — verify before quoting.
- Petroleum is in Tertiary sedimentary rocks — not Gondwana beds, not the Dharwars (UPSC 2013). Brahmaputra-valley fields: Naharkatia and Moran (UPSC 1990).
- The 18,500 km and 34,000 km figures are undated in the book. Check the latest Petroleum and Natural Gas Regulatory Board / Ministry of Petroleum figure before quoting.
Beyond NCERT — oil and gas, dated
- Oil was struck at Digboi in 1889; the Digboi refinery (1901) is India's oldest working refinery. Mumbai High was discovered in 1974 and began producing in 1976.
- The HVJ (HBJ) pipeline was built by GAIL in the late 1980s. GAIL was set up in 1984.
- India imports most of its crude oil — well over 80% of consumption in recent years (Petroleum Planning and Analysis Cell — check the latest year); this is the ‘security of supply’ worry the book raises later.
9. Electricity: hydel, thermal and nuclear
In simple wordsA paper pinwheel spins whether you blow on it, hold it under a tap, or hold it over the steam of a kettle. A power station is a giant pinwheel — the turbine — and India spins it with falling water, with steam from burning coal and gas, or with steam heated by splitting atoms.
Electricity has so many uses that per capita consumption is an index of development. It is generated mainly in two ways: hydro electricity, by fast-flowing water — a renewable resource — driving turbines (multi-purpose projects such as Bhakra Nangal, the Damodar Valley Corporation and the Kopili hydel project); and thermal power, by burning coal, petroleum or natural gas — non-renewable fossil fuels — to drive turbines. Once generated, the electricity is exactly the same. Nuclear (atomic) energy comes from altering the structure of atoms, releasing heat that generates power; uranium and thorium are found in Jharkhand and the Aravalli ranges of Rajasthan, and the monazite sands of Kerala are rich in thorium.
| Nuclear power station on NCERT's map (p. 53) | State (†) |
|---|---|
| Tarapur | Maharashtra |
| Rawat Bhata (Rawatbhata) | Rajasthan |
| Narora (map: ‘Naraura’) | Uttar Pradesh |
| Kakrapar (map: ‘Kakrapara’) | Gujarat |
| Kaiga | Karnataka |
| Kalpakkam | Tamil Nadu |
| Thermal power stations on NCERT's map (p. 53), by state (†) | Stations |
|---|---|
| Delhi | Delhi |
| Haryana | Faridabad |
| Uttar Pradesh | Harduaganj, Panki, Parichha, Rihand |
| Uttar Pradesh–Madhya Pradesh border | Singrauli |
| Bihar | Barauni |
| Assam | Namrup, Bongaigaon |
| Gujarat | Sabarmati, Gandhinagar, Vanakbori (map: ‘Vanakbari’), Dhuvaran (map: ‘Dhuvaram’), Ahmedabad, Ukai |
| Madhya Pradesh | Satpura, Amarkantak |
| Chhattisgarh | Korba |
| Jharkhand | Chandrapura |
| West Bengal | Santaldih, Durgapur, Kolkata |
| Odisha | Talcher |
| Maharashtra | Koradi, Bhusawal, Nashik, Trombay, Uran, Parli, Chandrapur |
| Telangana | Ramagundam, Kothagudem (map: ‘Kottagudam’) |
| Andhra Pradesh | Vijayawada |
| Tamil Nadu | Ennore, Neyveli, Tuticorin |
Reading the map ‘India: Distribution of Nuclear and Thermal Power Plants’ and the activities (pages 52–54) — described in words, not redrawnA full-page outline map with two symbols: triangles for nuclear and dots for thermal power plants. What it shows: 6 nuclear stations, all but Narora near the coast or in Rajasthan and the western peninsula (Tarapur, Rawat Bhata, Narora, Kakrapar, Kaiga, Kalpakkam), and 37 thermal stations — clusters around Ahmedabad–Gandhinagar, Mumbai–Nashik, the Damodar valley and Kolkata, the Singrauli–Rihand coal belt, and the Godavari coalfields, plus coastal stations at Ennore and Tuticorin and gas-based ones such as Uran and Namrup. The point: thermal stations follow coal (or ports and gas lines); nuclear stations need water for cooling and are kept away from big cities. The tables above list every symbol by state.
Activities: name river valley projects and their dams (p. 52); collect information on thermal and hydel plants in your state and show them on a map (p. 54); locate the 6 nuclear power stations and their states (p. 54). Outlines in the in-text section.
Activities: name river valley projects and their dams (p. 52); collect information on thermal and hydel plants in your state and show them on a map (p. 54); locate the 6 nuclear power stations and their states (p. 54). Outlines in the in-text section.
NCERT details to read carefully — power
- The map's six nuclear stations leave out Kudankulam (Tamil Nadu), in commercial operation since 2014 and now the largest (Beyond NCERT). Safe line: ‘NCERT's map shows six; Kudankulam has since been added’.
- Monazite is mainly a thorium ore (exercise 1(iv); UPSC 1991, 1994); it also carries a little uranium (UPSC 2009 key: ‘Kerala's monazite sands contain uranium’ — correct) and is a source of rare earths (UPSC 2022, legy205).
- ‘Rihand’ appears as a dam in jess103 and as a thermal station here — both exist in the Sonbhadra area (Beyond NCERT).
- The largest source of India's electricity is thermal, mostly coal (UPSC 1982).
Beyond NCERT — power, dated
- Tarapur (1969) was India's first nuclear power station. India follows Homi Bhabha's three-stage programme (1950s): natural-uranium reactors, then fast breeder reactors, then thorium — to use the thorium of the monazite sands. The Civil Liability for Nuclear Damage Act dates from 2010.
- Per capita electricity consumption was about 1,395 kWh in 2023–24 (Central Electricity Authority — verify).
- By mid-2025, non-fossil sources (renewables, large hydro and nuclear) made up about half of India's installed power capacity, though coal still produced most of the electricity actually generated (CEA/Ministry of Power — check the latest).
10. Non-conventional energy, and conserving energy
In simple wordsA family that buys all its vegetables pays whatever the market asks. One that also grows some in the backyard, and wastes less, is safer when prices jump. Sunlight, wind, tides, the earth's heat and farm waste are India's backyard garden of energy — and saving energy is the cheapest crop.
Growing consumption has made India increasingly dependent on coal, oil and gas. Rising prices and possible shortages of oil and gas create uncertainty about the security of energy supply, with serious repercussions for the economy, and fossil fuels cause serious environmental problems. Hence the pressing need for renewable sources — solar, wind, tide, biomass and energy from waste — the non-conventional sources. India, blessed with sunlight, water, wind and biomass, has some of the largest programmes for them.
- Solar: a tropical country with enormous potential; photovoltaic technology converts sunlight directly into electricity. Popular in rural and remote areas; big solar plants will reduce rural dependence on firewood and dung cake, helping conservation and leaving more manure for farms.
- Wind: great potential; the largest wind-farm cluster runs from Nagercoil to Madurai (Tamil Nadu); Andhra Pradesh, Karnataka, Gujarat, Kerala, Maharashtra and Lakshadweep have important farms; Nagercoil and Jaisalmer are known for effective use.
- Biogas: shrubs, farm waste and animal and human waste decompose into gas with higher thermal efficiency than kerosene, dung cake and charcoal; plants are municipal, cooperative or individual; cattle-dung plants are ‘Gobar gas plants’ — the most efficient use of dung, giving energy plus better manure and saving trees.
- Tidal: floodgate dams across inlets trap high-tide water and release it through turbines as the tide falls; ideal sites: Gulf of Khambhat, Gulf of Kachchh (Gujarat) and the Gangetic delta in the Sundarbans (West Bengal).
- Geothermal: heat from the earth's interior, which grows hotter with depth; where the geothermal gradient is high, groundwater turns to steam that can drive turbines. India has several hundred hot springs; two experimental projects: Parvati valley near Manikaran (Himachal Pradesh) and Puga valley (Ladakh).
⤵ Tidal power, NCERT's sequence
Build a floodgate damacross a narrow inlet
High tidewater flows into the inlet; the gate is closed to trap it
Tide falls outsidethe inlet now stands higher than the sea
Release through a pipethe water turns a turbine on its way back to the sea
Reading Figs 5.10–5.12 and the activity (pages 54–55)
- Fig. 5.10 ‘Solar operated electronic milk testing equipment’: villagers at a whitewashed milk-collection centre with a solar panel on the roof; a man tests milk at an electronic machine. The point: solar power brings fair, quick testing to remote dairies.
- Activity: collect information about newly established solar power plants in India. Outline in the in-text section.
- Fig. 5.11 ‘Wind mills – Nagarcoil’: a row of tall three-bladed wind turbines on a ridge under a blue sky. The point: the Nagercoil–Madurai cluster.
- Fig. 5.12 ‘Biogas Plant’: large round brick digester pits under construction, a man standing on one rim. The point: biogas plants are simple masonry that villages can build.
Conservation of energy: every sector — agriculture, industry, transport, commercial and domestic — needs energy, and consumption has risen steadily since Independence. A sustainable path rests on two planks: energy conservation and more use of renewables. NCERT calls India ‘presently one of the least energy efficient countries’ and asks citizens to use public transport, switch off unused lights, use power-saving devices and non-conventional sources: ‘energy saved is energy produced’.
⤵ Sustainable energy: NCERT's twin planks
Demand keeps risingevery sector needs energy for development
Conservepublic transport, switch off, efficient devices
Shift to renewablessolar, wind, biogas, tidal, geothermal
Resultsecure supply, less pollution — ‘energy saved is energy produced’
| India's energy mix — the debate (Beyond NCERT attribution) | Who | Position |
|---|---|---|
| Coal remains the base | Ministry of Coal; Central Electricity Authority planning | abundant at home, reliable round the clock, affordable; needed for energy security and growth while renewables scale up |
| Move fast to renewables | Ministry of New and Renewable Energy; climate researchers and environmental groups | solar and wind costs have fallen sharply; less import dependence and pollution; meets climate commitments |
| Nuclear as low-carbon base load | Department of Atomic Energy; NPCIL | steady power without carbon emissions; thorium for the long term |
| Doubts about nuclear | local groups such as the People's Movement Against Nuclear Energy at Kudankulam (2011–12); some scientists and economists | safety, waste, cost and liability; displacement of fishing communities |
| Bare facts | Government of India; UNFCCC | net zero by 2070 (announced 2021); updated NDC (2022): cut emissions intensity of GDP by 45% from 2005 levels and reach 50% of installed power capacity from non-fossil sources by 2030; target of 500 GW non-fossil capacity by 2030 |
Beyond NCERT — renewables, dated
- National Solar Mission: 2010. International Solar Alliance: launched by India and France at the Paris climate conference, 2015 (UPSC 2016). PM-KUSUM (solar pumps for farmers): 2019. PM Surya Ghar (rooftop solar for households): 2024.
- India's installed solar capacity crossed 100 GW in early 2025 (MNRE — check the latest). Bhadla (Jodhpur, Rajasthan, about 2.2 GW) is among the world's largest solar parks; Rajasthan and Gujarat lead in solar.
- Wind: Gujarat overtook Tamil Nadu in 2024 to lead installed capacity, with Tamil Nadu second (MNRE; check the latest); Muppandal near Nagercoil is the famous cluster.
- GOBARdhan (biogas from cattle dung and farm waste): 2018. The Bureau of Energy Efficiency (2002, under the Energy Conservation Act, 2001) runs star labels for appliances (UPSC 2016).
NCERT details to read carefully — non-conventional energy
- ‘Nagarcoil’ = Nagercoil; the cluster runs Nagercoil–Madurai in Tamil Nadu, and Jaisalmer is the other named site.
- Tidal sites: Khambhat, Kachchh, Sundarbans. Geothermal: Manikaran (Parvati valley, Himachal Pradesh) and Puga (Ladakh). Do not swap them.
- ‘India is one of the least energy efficient countries’ is undated; India's energy intensity of GDP has been falling (Beyond NCERT). Safe line: ‘NCERT stresses that India must use energy more efficiently’.
- Biogas is the most efficient use of dung because it yields both gas and manure; burning dung cake destroys the manure (UPSC 1984, 1988).
In-text questions and activities — answer outlines
The chapter has eleven ‘Dig a little deeper’ prompts, three activities and several map tasks. Outlines below.
p. 42: List items in your house made of metals. Where do these metals come from?
Utensils (steel, aluminium), pressure cooker, taps (brass), wires (copper), locks and keys, furniture fittings, coins, jewellery. Metals come from ores mined from the earth's crust and refined — iron from hematite and magnetite, aluminium from bauxite, copper from copper ores.
Toothpaste box, p. 42: Find out where these minerals are found.
Silica — sand and quartz everywhere; limestone — Rajasthan, Andhra Pradesh, Madhya Pradesh (Fig. 5.7); fluorite — Gujarat, Rajasthan (Beyond NCERT); rutile and ilmenite — beach sands of Kerala, Tamil Nadu and Odisha (Beyond NCERT); mica — Koderma–Gaya–Hazaribagh, Ajmer, Nellore; plastics — from petroleum (Mumbai High, Gujarat, Assam).
Dig a little deeper, p. 42: How many minerals are used to make a light bulb?
Glass (silica sand, soda ash, limestone), tungsten filament (an LED instead uses gallium and other elements), copper or nickel lead wires, aluminium or brass cap, solder (tin, lead), and inert gas (argon). Roughly ten — a good example that ordinary objects are bundles of minerals.
Dig a little deeper, p. 42: Collect ‘Nutritional Facts’ printed on food labels.
Note the minerals listed — sodium, potassium, calcium, iron, phosphorus, magnesium, zinc — with amounts per serving. Link to the box: minerals are only about 0.3% of intake but essential for using the rest.
p. 42: Minerals range from the hardest diamond to the softest talc. Why are they so varied?
Each forms from a different combination of elements under different physical and chemical conditions (temperature, pressure, the setting), which gives each its own colour, hardness, crystal form, lustre and density.
Dig a little deeper, p. 44: What is the difference between an open-pit mine, a quarry and an underground mine with shafts?
Open pit: a large surface excavation in benches for ores near the surface (iron ore, bauxite, much coal). Quarry: a surface working for building stone and rock minerals — limestone, marble, granite, sandstone. Underground (shaft) mine: vertical shafts and horizontal galleries reach deep seams or lodes; costlier and riskier (roof collapse, flooding, gas, fires).
Dig a little deeper, p. 45: Superimpose the maps of iron ore, manganese, coal and the iron and steel industry. Is there a correlation? Why?
Yes — steel plants cluster where iron ore, coal and manganese lie close together: the Chota Nagpur plateau and its edges (Jharkhand, Odisha, Chhattisgarh, West Bengal). Raw materials are bulky and lose weight in smelting, so plants locate near them to cut transport costs (more in jess106).
Dig a little deeper, p. 47: Locate the mines of bauxite on a physical map of India.
On the Amarkantak plateau and Maikal hills (Madhya Pradesh–Chhattisgarh), the Bilaspur–Katni plateau, and Koraput (Panchpatmali) in Odisha's Eastern Ghats; Jharkhand and Gujarat also produce (Fig. 5.5). Note that they are on flat-topped plateaus — where laterite weathering leaves bauxite.
Dig a little deeper, p. 48: Study the maps to explain why Chota Nagpur is a storehouse of minerals.
Ancient peninsular rocks (Archaean and Dharwar metamorphics, igneous intrusions) hold iron ore, manganese, copper, mica and uranium in veins and beds; Gondwana basins (Damodar valley) hold the best coking coal; long weathering left bauxite. Old, varied geology over a long time = many minerals together.
Hazards of mining box, p. 48: What efforts do miners make for our comfort? What are the impacts of mining on miners' health and the environment?
Miners work deep underground or in dusty pits, in heat, noise and danger. Health: dust and fumes → lung diseases (pneumoconiosis, silicosis); risk of roof collapse, flooding, fires. Environment: contaminated water, waste dumps and slurry degrading land and soil, river pollution, dust, deforestation. Remedy: stricter safety rules and enforcement of environmental laws.
Dig a little deeper, p. 50: List items where substitutes are used instead of minerals. Where are the substitutes obtained from?
Plastic buckets, pipes and chairs (replacing iron, copper, wood) — from petroleum; optical fibre (replacing copper cables) — from silica; aluminium for copper in power lines — from bauxite; composites and carbon fibre in vehicles; bamboo and recycled materials. Note that many substitutes are themselves made from minerals.
Activity, p. 51: Collect information about cross-country gas pipelines laid by GAIL under ‘One Nation One Grid’.
List major lines with route and length (HVJ/HBJ and its upgrades, Dahej–Vijaipur, Jagdishpur–Haldia–Bokaro–Dhamra ‘Pradhan Mantri Urja Ganga’, Kochi–Mangaluru, the North-East gas grid — Beyond NCERT examples). Note the aim: link all gas sources (domestic fields, LNG terminals) to all markets (fertiliser, power, city gas). Cite GAIL/PNGRB with dates.
p. 52: From the map, locate the 3 major offshore fields of western India.
The map marks Mumbai High and Bassein offshore, with offshore gas in the Gulf of Khambhat; guides often name Aliabet (Gulf of Khambhat) as the third — check before quoting.
Activity, p. 52: Name some river valley projects and write the names of the dams built on these rivers.
Satluj — Bhakra Nangal; Damodar — Tilaiya, Konar, Maithon, Panchet (DVC); Mahanadi — Hirakud; Chambal — Gandhi Sagar, Rana Pratap Sagar, Kota; Narmada — Sardar Sarovar; Krishna — Nagarjuna Sagar; Kopili (Assam) — Kopili hydel project (jess103 has the full table).
p. 54: Collect information about thermal/hydel power plants located in your state. Show them on a map of India.
From the state electricity board or CEA lists, note each plant's name, fuel or river, capacity (MW), owner and year. Mark them on an outline map with separate symbols; note whether thermal plants sit near coalfields, ports or gas lines, and hydel plants on hill rivers.
p. 54: Locate the 6 nuclear power stations and find out the state in which they are located.
Tarapur (Maharashtra), Rawatbhata (Rajasthan), Narora (Uttar Pradesh), Kakrapar (Gujarat), Kaiga (Karnataka), Kalpakkam (Tamil Nadu). Add Kudankulam (Tamil Nadu, 2014) as the newest, not on the book's map.
Activity, p. 54: Collect information about newly established solar power plants in India.
For each park: name, state, capacity, year, developer — e.g. Bhadla (Rajasthan), Pavagada (Karnataka), Rewa (Madhya Pradesh), Kurnool (Andhra Pradesh), the Khavda renewable park (Gujarat) (Beyond NCERT examples; check capacities on MNRE/SECI sites). Note why they are in dry, sunny, open land.
NCERT exercise and crossword — answer outlines
Four MCQs, four 30-word and two 120-word questions, and a crossword. Try first, then open.
1 (i) Which mineral is formed by decomposition of rocks, leaving a residual mass of weathered material? (a) coal (b) bauxite (c) gold (d) zinc
(b) bauxite.
(ii) Koderma, in Jharkhand, is the leading producer of: (a) bauxite (b) mica (c) iron ore (d) copper
(b) mica.
(iii) Minerals are deposited and accumulated in the strata of which rocks? (a) sedimentary (b) metamorphic (c) igneous (d) none of the above
(a) sedimentary rocks — beds and layers.
(iv) Which mineral is contained in monazite sand? (a) oil (b) uranium (c) thorium (d) coal
(c) thorium (monazite also carries a little uranium, but thorium is the answer).
2 (i) Distinguish: (a) ferrous and non-ferrous minerals (b) conventional and non-conventional sources of energy.
(a) Ferrous minerals contain iron — iron ore, manganese, nickel, cobalt; about three-fourths of the value of metallic minerals. Non-ferrous minerals contain no iron — copper, bauxite, lead, zinc, gold. (b) Conventional: long in use — firewood, dung cake, coal, petroleum, natural gas, hydel and thermal electricity; mostly exhaustible and polluting. Non-conventional: newer — solar, wind, tidal, geothermal, biogas, atomic; mostly renewable and cleaner.
(ii) What is a mineral?
A ‘homogeneous, naturally occurring substance with a definable internal structure’; rocks are combinations of minerals. Examples range from diamond (hardest) to talc (softest).
(iii) How are minerals formed in igneous and metamorphic rocks?
Molten or gaseous mineral matter is forced upward through cracks, crevices, faults and joints, and cools and solidifies as it rises — small deposits are veins, large ones lodes. Tin, copper, zinc and lead come from them.
(iv) Why do we need to conserve mineral resources?
They are finite and non-renewable: formed over millions of years, replenished infinitely slowly, and workable deposits are only about 1% of the crust. Continued extraction goes deeper and to poorer ores, raising costs. Industry and agriculture depend on them — so use them planfully, recycle, use scrap and substitutes.
3 (i) Describe the distribution of coal in India.
Two ages: Gondwana (over 200 million years; most of India's coal, metallurgical grade) — the Damodar valley of Jharkhand–West Bengal (Jharia, Raniganj, Bokaro), and the Godavari (Singareni), Mahanadi (Talcher, Korba), Son (Singrauli) and Wardha valleys; Tertiary (about 55 million years) — Meghalaya, Assam (Makum), Arunachal Pradesh, Nagaland; lignite — Neyveli (Tamil Nadu), used for power. Coal is bulky and loses weight on use, so heavy industries and thermal plants sit on or near the fields. Add a sketch table, not a map, in a hurry.
(ii) Why do you think that solar energy has a bright future in India?
A tropical country with abundant sunshine most of the year; photovoltaic panels turn sunlight directly into electricity and suit remote rural areas off the grid (Fig. 5.10's milk testing); big plants can cut rural use of firewood and dung cake — saving forests and leaving dung as manure; it is renewable and clean, reducing dependence on imported oil and gas and fossil-fuel pollution. Beyond NCERT: falling panel costs, the National Solar Mission (2010), rooftop schemes, and capacity above 100 GW by 2025 (MNRE). Challenges: land, storage, night-time supply, grid integration.
Activity: fill in the crossword. DOWN — 1 found in placer deposits (4); 2 iron ore mined in Bailadila (8); 3 indispensable for the electrical industry (4); 4 geological age of coal in north-east India (8); 5 formed in veins and lodes (3). ACROSS — 1 a ferrous mineral (9); 2 raw material for cement (9); 3 finest iron ore with magnetic properties (9); 4 highest-quality hard coal (10); 5 ore from which aluminium is obtained (7); 6 Khetri mines are famous for it (6); 7 formed by evaporation (6).
Down: 1 GOLD, 2 HEMATITE, 3 MICA, 4 TERTIARY, 5 TIN. Across: 1 MANGANESE, 2 LIMESTONE, 3 MAGNETITE, 4 ANTHRACITE, 5 BAUXITE, 6 COPPER, 7 GYPSUM. (We placed every word on the printed grid: all crossings agree with each other and with the printed letters M, M, M, T, T, o, y.) Note: Down 2 must be spelt HEMATITE — the 9-letter ‘haematite’ will not fit.
Keys to handle with care
- 2(i)(b): if you list atomic energy as non-conventional (this book) do not call it renewable; the Class 12 book puts nuclear minerals under conventional sources. State your grouping.
- 1(iv): monazite contains thorium and a little uranium — ‘thorium’ is the expected answer; UPSC 2009 treated ‘monazite contains uranium’ as correct too.
- Crossword Down 5 has three letters: TIN — zinc, lead and copper also form veins and lodes but do not fit.
⤵ Answer frame for mineral and energy questions
Define and classifymineral, ore; ferrous, non-ferrous, non-metallic; conventional, non-conventional
Occurrenceveins and lodes, beds, residual, placer, ocean — with examples
Distribution with dated databelts, leading states (2018–19 shares), coal ages, oil fields
Uses and linkagessteel, aluminium, cement, electricity; industry on the coalfield
Costs and conservationhazards, recycling, substitutes; renewables and efficiency; positions with their authors
What to remember
Numbers
Minerals in our diet (box)≈ 0.3% of nutrient intake; unlock the other 99.7%
Minerals identified‘over 2,000’ (NCERT); more than 5,000 recognised today (Beyond NCERT)
Ferrous minerals≈ three-fourths of the value of metallic minerals (undated)
Iron contentmagnetite up to 70%; hematite 50–60% (NCERT); pure minerals 72.4% and 69.9% †
Iron ore, 2018–1997% from Odisha, Chhattisgarh, Karnataka, Jharkhand
Bailadila14 deposits of super-high-grade hematite; exported to Japan and South Korea via Visakhapatnam
Manganese≈ 10 kg per tonne of steel (≈ 1% †); 2018–19: MP 33, Maharashtra 27, Odisha 16, Karnataka 12, AP 10%
Bauxite, 2018–19Odisha 65%, Jharkhand 10, Gujarat 9, Chhattisgarh 6, Maharashtra 6, MP 3
Limestone, 2018–19Rajasthan 22%, AP 13, MP 13, Chhattisgarh 11, Karnataka 10; top three 48% †
Workable mineral deposits≈ 1% of the earth's crust
Rural energy (undated)firewood + dung cake > 70% of household needs
Coal agesGondwana ‘a little over 200 million years’ (mostly 250–300 †); Tertiary ≈ 55 million years
Gas pipelines (undated)HVJ 1,700 km → network 18,500 km (≈ 10.9 × †) → Gas Grid ‘over 34,000 km’
Power plants on the map6 nuclear (Tarapur, Rawatbhata, Narora, Kakrapar, Kaiga, Kalpakkam); 37 thermal †
Dated facts †Digboi oil 1889, refinery 1901; Tarapur 1969; Coal India 1975; Mumbai High 1974/76; Kudremukh closed 2005; NGT rat-hole ban 2014; Kudankulam 2014; ISA 2015; coal > 1 billion t 2024–25
One-liners
- A mineral is homogeneous and natural; a rock is a mix of minerals.
- Veins and lodes: igneous and metamorphic. Beds: sedimentary. Bauxite: residual. Gold and tin: placers.
- Magnetite is the finest iron ore; hematite is the most used.
- Manganese is the steel-maker's essential pinch: about 10 kg per tonne.
- Koderma means mica; Khetri means copper; Panchpatmali means bauxite.
- Minerals are finite: recycle, substitute, use low-grade ores well.
- Gondwana coal is old and metallurgical; Tertiary coal is young and north-eastern.
- Oil hides in anticlines and fault traps; gas sits above oil.
- Coal is bulky and loses weight on use, so industry goes to the coalfield.
- Energy saved is energy produced.
Traps to avoid
- Bauxite (not coal, gold or zinc) forms as a residual weathered mass.
- Monazite → thorium (with a little uranium); Kerala's beach sands.
- Kudremukh mine closed in 2005 — the book's ‘100% export unit’ is history.
- Hydel is conventional but renewable; atomic is non-conventional here but not renewable.
- Neyveli lignite is Tertiary; the Damodar coal is Gondwana.
- Gondwana coal is mostly 250–300 million years old, not just ‘over 200’.
- Petroleum is in Tertiary rocks — not in Gondwana beds or Dharwars.
- The map's six nuclear stations omit Kudankulam (2014).
- ‘COD’ in the book is a misprint for CGD — city gas distribution.
How to strategise
Prelims — what UPSC asks
- From this chapter: mineral–place and mineral–use matches — bauxite → aluminium (1980, 1983), Neyveli/Jharia/Hazaribagh (1984), mica in electricals (1984), lignite in Tamil Nadu (1985), copper in Singhbhum and the Jharia–Ankleshwar–Bailadila match (1989), Damodar coalfields and Assam oil fields (1990), monazite → thorium (1991, 1994, 2009), Neyveli's Tertiary coal (1993), Gondwana coal (2010), Koderma mica (2013); coal ranks (1989, 1999); energy groups (1982, 1984, 1987, 1988); gypsum as non-metallic (1988); gold and copper in old rocks (1992 — debatable key); pneumoconiosis (2005). Learn the three map tables as lists by state.
- Production shares, capacity and pipeline lengths change every year: quote NCERT's with its year (2018–19) and check the latest Ministry of Mines, Ministry of Coal, CEA and MNRE figures close to the exam.
Mains — where it appears and how to answer
- GS1: atomic minerals (2013), coal mining vs environment (2017), solar potential and regional variation (2020), mining's small share of GDP (2021), wind energy (2022), benefits of solar (2025). GS3: electricity from sunlight (2020), mining as an environmental hazard (2025), energy security (2026). Use the chapter's distribution, hazards, conservation and ‘twin planks’, then add dated schemes and capacities.
- On mining in tribal areas, coal vs renewables, and nuclear power, set out the positions side by side with their authors and give laws, court orders and climate targets as dated facts — no side-taking.
Self-check
Tap an option. NCERT's own exercise questions come first; the rest test the figures and common confusions.
1. Which mineral forms when surface rocks decompose and soluble parts are removed, leaving a residual mass?
2. The Koderma–Gaya–Hazaribagh belt is the leading producer of:
3. Which state produced about 65% of India's bauxite in 2018–19 (Fig. 5.5)?
4. The principal lignite reserves of India are at:
5. In an anticline, oil is found:
6. Which of these is classed as non-conventional in NCERT's list but is NOT renewable?
7. NCERT's two experimental geothermal projects are at:
UPSC questions from this chapter
Open any question to attempt it in the Question bank — your attempt is saved to your progress.