🌍 Class 10 Geography – Contemporary India II
Chapter 5: Minerals and Energy Resources
Original Visual Revision Notes Independently created study material. Not affiliated with or endorsed by NCERT.

📌 Contents 1. 📚 Chapter Notes 2. 🎨 Easy Illustrations 3. ✏️ Worked Examples 4. 📋 Cheat Sheet 5. 🏠 Take-Home Handout 6. 🃏 Revision Flashcards 7. 🧠 Mind Map

📝 Section 1 — Chapter Notes

💎 What is a Mineral?

⛏ Ferrous Minerals — Iron Ore and Manganese

💎 Non-Ferrous Minerals — Copper and Bauxite

🔧 Non-Metallic Minerals — Mica and Limestone

🔥 Conventional Energy — Coal and Petroleum

📈 Natural Gas and Electricity

☀️ Non-Conventional Energy Sources

⛆️ Conservation of Minerals and Energy

🎨 Section 2 — Easy Illustrations

How Minerals Occur in Nature — Five Forms Veins / Lodes Igneous rock cracks & joints Tin, copper, zinc Beds / Layers Sedimentary rock horizontal strata Coal, iron ore Residual Rock decomposition surface weathering Bauxite Placer Deposits Valley floors alluvial sand Gold, silver, tin Ocean Water Dissolved in sea ocean beds Salt, magnesium Iron Ore Belts of India Odisha–Jharkhand: Badampahar, Gua, Noamundi Durg–Bastar–Chandrapur: Bailadila (CG), exported to Japan/S. Korea Ballari–Chitradurga (Karnataka): Kudremukh — 100% export unit Maharashtra–Goa belt also important · Exported through Marmagao port
Five modes of mineral occurrence and India’s major iron ore belts
Coal Grades — From Lowest to Highest Quality Quality PEAT Decaying plants in swamps Low carbon & heat LIGNITE Brown coal; high moisture Neyveli, Tamil Nadu Used for electricity BITUMINOUS Most popular commercial coal Damodar Valley, Raniganj Industry, power, smelting ANTHRACITE Highest quality hard coal Rare; north-east India Maximum heat & carbon Gondwana coal: 200 million years old (Damodar Valley — best quality metallurgical coal) Tertiary coal: 55 million years old (Meghalaya, Assam, Arunachal Pradesh) Heavy industries built NEAR coalfields because coal loses weight (turns to ash) on use
Four grades of coal — quality increases from peat to anthracite
Petroleum and Natural Gas — Key Facts PETROLEUM Mumbai High — largest offshore field Gujarat: Ankeleshwar most important Assam: oldest producer; Digboi, Naharkatiya Found in anticlines and fault traps NATURAL GAS Found with petroleum deposits Mumbai High, Cambay, K–G basin Used as CNG (transport) and PNG (cooking) GAIL HVJ pipeline: 1700 km → 18,500 km Refineries act as “nodal industry” for synthetic textiles, fertilisers and chemicals. Gas lighter than oil — sits on top of oil in rock traps Nuclear: Uranium (Jharkhand, Rajasthan) + Thorium (Kerala monazite sands)
Petroleum and natural gas — location and uses in India
Non-Conventional Energy Sources — At a Glance SOLAR Photovoltaic Rajasthan, Gujarat WIND Nagarcoil–Madurai Tamil Nadu BIOGAS Gobar gas plants Rural India NUCLEAR Uranium, Thorium Jharkhand, Kerala GEOTHERMAL Manikaran (HP) Puga Valley (Ladakh) All five sources are RENEWABLE and environmentally friendly alternatives to fossil fuels. India has the largest programme for developing renewable energy resources.
India’s five major non-conventional energy sources and where they are harnessed

✏️ Section 3 — Worked Examples

📖 Worked Example 1

Question: Why are magnetite and hematite both important? How do they differ?

1 Magnetite: highest iron content (up to 70%); excellent magnetic properties; best for electrical industry.
2 Hematite: iron content 50–60%; most important in terms of quantity used industrially.
3 Hematite is used in steel making because large quantities are available and it is easily processed.
4 Magnetite, while purer, is less common; it is preferred where magnetic properties are needed.
Answer: Magnetite has superior quality (70% iron) and magnetic properties making it ideal for electrical use. Hematite, slightly lower grade, is used more for steel because it is produced in greater quantity. Both are essential for India’s industrial growth.

📖 Worked Example 2

Question: Why is coal called a bulky material and why are industries located near coalfields?

1 Coal is heavy and occupies a large volume relative to its energy content.
2 When coal burns, it turns to ash — it loses weight during use.
3 Transporting heavy coal long distances is expensive and inefficient.
4 So steel plants and thermal power stations are set up near coalfields to cut transport costs.
Answer: Coal reduces in weight when burned (it becomes ash), so it is not economic to transport it far. Heavy industries like iron-steel plants are located near coalfields such as Jharia, Raniganj and Bokaro in the Damodar Valley.

📖 Worked Example 3

Question: Why are minerals said to be non-renewable resources that need conservation?

1 Minerals take millions of years to form through geological processes.
2 The rate at which we use minerals is far greater than the rate at which they form.
3 Only 1% of Earth’s crust has workable mineral deposits; deeper mining is costly and harder.
4 Conservation strategies: recycle metals, use scrap, develop substitutes, improve extraction technology.
Answer: Minerals are finite — once used, they cannot be renewed in a human lifetime. Rising demand and falling ore quality make conservation essential through recycling, better technology and finding alternative materials.

📖 Worked Example 4

Question: Compare the advantages of biogas over burning dung cakes or firewood.

1 Biogas has much higher thermal efficiency than dung cakes, kerosene or charcoal.
2 Burning dung cakes wastes the manure that could improve agricultural soil.
3 Gobar gas plants produce both energy (gas) AND improved manure as by-products.
4 Biogas reduces need for firewood, thus helping preserve forests.
Answer: Biogas is more efficient and gives a dual benefit — clean cooking fuel and nutrient-rich manure. It reduces firewood cutting (protects forests) and preserves valuable dung for agriculture, making it the most efficient use of cattle dung.

📋 Section 4 — Cheat Sheet

TermMeaning
OreAn accumulation of mineral mixed with other elements; commercial extraction is viable
Vein / LodeMinerals in cracks of igneous rocks; smaller = vein, larger = lode
Placer DepositMinerals in alluvial sand of valley floors; gold, silver, tin, platinum
MagnetiteFinest iron ore; up to 70% iron; excellent magnetic properties
HematiteMost used industrial iron ore; 50–60% iron; backbone of steel industry
BauxiteClay-like mineral that is the source of aluminium
MicaThin-plate mineral with excellent insulating properties; used in electronics
LigniteLow grade brown coal with high moisture; found at Neyveli, Tamil Nadu
Bituminous CoalMost popular commercial coal; Damodar Valley
Mumbai HighLargest offshore petroleum field off India’s west coast
GAIL HVJ PipelineIndia’s first 1700 km cross-country gas pipeline; links Mumbai High to north India
Gobar Gas PlantBiogas plant using cattle dung; gives gas + enriched manure
Geothermal EnergyEnergy from hot springs; experimental sites at Manikaran (HP) and Puga Valley (Ladakh)
Rat-Hole MiningFamily-based narrow tunnel mining in Meghalaya; declared illegal by NGT

📄 Section 5 — Take-Home Handout

✍️ A. Fill in the Blanks

  1. The finest iron ore with up to 70% iron content is called __________.
  2. India’s oldest oil-producing state is __________.
  3. __________ coal is the highest quality hard coal.
  4. Gobar gas plants give two benefits: energy and improved __________.
  5. India’s largest wind farm cluster is in Tamil Nadu from Nagarcoil to __________.

✅ B. True or False

  1. Bauxite is a source of copper metal. [ ]
  2. Mica has excellent insulating properties and is used in electronics. [ ]
  3. Lignite is the highest quality coal found in India. [ ]
  4. Non-conventional energy sources are renewable. [ ]
  5. GAIL built the first cross-country natural gas pipeline in India. [ ]

🔗 C. Match the Columns

Column A

  1. Kudremukh
  2. Neyveli
  3. Balaghat
  4. Digboi
  5. Koderma–Gaya

Column B

  1. Mica (Jharkhand)
  2. Copper mine (MP)
  3. Iron ore, Karnataka
  4. Petroleum, Assam
  5. Lignite coal, Tamil Nadu

📝 D. Short Answer Questions

  1. What are placer deposits? Name two minerals found in them.
  2. Why is per capita electricity consumption considered an indicator of development?
  3. How is geothermal energy generated?

🌎 E. Think Questions

  1. Why should we use non-conventional sources of energy instead of coal?
  2. How does mining affect the health of miners and the environment?
  3. Why does India have vast potential for solar energy?

✅ Detailed Answers

A: 1. Magnetite   2. Assam   3. Anthracite   4. Manure   5. Madurai
B: 1. False (bauxite is source of aluminium)   2. True   3. False (lignite is lowest grade; anthracite is highest)   4. True   5. True
C: 1–c   2–e   3–b   4–d   5–a
D1: Placer deposits are minerals in alluvial sand of valley floors and hill bases. Two minerals: gold and silver.
D2: Electricity powers industry, transport, homes and communication. More electricity = more production and higher living standards, so per capita consumption reflects a nation’s economic and social development level.
D3: Underground heat warms groundwater. The hot water rises and turns into steam. This steam drives turbines to generate electricity. India has experimental plants at Manikaran (Himachal Pradesh) and Puga Valley (Ladakh).
E1: Coal is non-renewable — once burned it is gone. It also releases CO2, causing pollution and climate change. Non-conventional sources like solar and wind are inexhaustible, produce no pollution, and reduce import dependence.
E2: Miners inhale dust and toxic fumes, leading to lung disease. Mine roof collapses and floods are constant dangers. Mining causes water pollution, land degradation, and fills rivers with slurry and waste.
E3: India is a tropical country that receives abundant sunshine throughout the year. Long daylight hours and many sunny regions make photovoltaic technology cost-effective, especially in rural areas far from power grids.

🃏 Section 6 — Revision Flashcards

Name the five ways minerals occur in rocks.
Veins/lodes, beds/layers, residual deposits, placer deposits, ocean water
What are the four grades of coal in order of quality?
Peat (lowest) → Lignite → Bituminous → Anthracite (highest)
Name India’s three major petroleum-producing regions.
Mumbai High (offshore), Gujarat (Ankeleshwar), Assam (Digboi, Naharkatiya)
What minerals are used for nuclear energy in India?
Uranium (Jharkhand, Rajasthan) and Thorium (monazite sands of Kerala)
What is the GAIL HVJ pipeline?
India’s first cross-country natural gas pipeline (1700 km); links Mumbai High to north India
Why is mica important for industry?
Excellent insulating properties; low power loss; used in all electrical and electronic devices
Name the iron ore belt where ore is exported to Japan and South Korea.
Durg–Bastar–Chandrapur belt; Bailadila hills in Chhattisgarh; exported via Vishakhapatnam port
What is rat-hole mining? Where was it practised?
Narrow family-based tunnel mining for coal in Meghalaya; declared illegal by the National Green Tribunal

🧠 Section 7 — Mind Map

Mineral Occurrence Veins · Beds · Residual Placer · Ocean Ferrous Minerals Iron ore · Manganese Non-Ferrous & Non-Metallic Copper · Bauxite · Mica Limestone Coal Peat→Lignite →Bituminous →Anthracite Petroleum & Gas Mumbai High · Gujarat · Assam HVJ Pipeline · GAIL Non-Conventional Energy Solar · Wind · Biogas · Nuclear · Geothermal Electricity Hydro · Thermal Bhakra Nangal · DVC Conservation Recycle Substitutes Low-grade ore Minerals & Energy Chapter 5
Mind map: Minerals and Energy Resources — all key topics at a glance