Minerals and Energy Resources – Vocabulary Review

Minerals in Daily Life

• Everyday metallic objects: cooking pots, cutlery, pins, nails, wires, vehicles, building frames, ships, railway lines, road tarmac, machines, implements.
• Metals originate in the Earth’s crust, locked in rock-embedded minerals; extraction requires mining + refinement.
• Minerals are indispensable: everything from a tiny pin to a skyscraper or ship derives from them; even food contains trace minerals essential for life.
• Cultural / historical uses: livelihood tools, decoration, festivals, religious rites.

Anecdote – Haban in Guwahati

– Observes “house-like objects” that move (buses, trains).
– Father (Ba) explains: vehicles are built of iron & aluminium, not bricks/stone; motion supplied by an engine that needs energy.

Toothpaste Example

– Abrasives: silica, limestone, aluminium oxide, phosphate minerals.
– Cavity-fighter fluoride comes from fluorite.
– Whitening pigment titanium oxide ⟶ minerals rutile, ilmenite, anatase.
– Glitter supplied by mica.
– Tube + brush are petroleum-based plastics.

Dig Deeper prompts:
• Identify locations of these minerals.
• Count minerals in a light bulb.

Minerals in Nutrition

– Human mineral intake ≈ $0.3\%$ of daily nutrients yet essential for utilising the remaining $99.7\%$ .
– Suggested activity: read “Nutritional Facts” on food labels.

Geological Definition

Mineral = “homogeneous, naturally occurring substance with a definable internal structure.”
Range from hardest diamond to softest talc owing to differing formation conditions.

Rocks, Properties & Classification

• Rock = aggregate of minerals; limestone is a one-mineral rock, most rocks poly-mineralic.
• > $2000$ minerals identified, but only a few dominate crustal rocks.
• Physical/chemical formation conditions create diversity in colour, hardness, crystal habit, lustre, density; geologists classify minerals by these traits.

Geographer vs. Geologist Focus

– Geographers: spatial distribution, economic activity, landforms.
– Geologists: genesis, age, physical/chemical composition.

Ore & Economic Viability

Ore = mineral accumulation with enough concentration for profitable extraction; structure influences cost of mining.

Modes of Occurrence

Veins (small) & lodes (large) in igneous / metamorphic cracks; form from upward-moving molten/gaseous solutions.
• Tin, copper, zinc, lead.
Beds/Layers in sedimentary strata via deposition & compaction.
• Coal, banded iron, gypsum, potash & sodium salts (evaporites in arid zones).
Residual mass after rock decomposition/leaching.
• Bauxite.

Placer (alluvial) deposits in valley sands / hill bases; water-resistant heavy minerals.
• Gold, silver, tin, platinum.
Ocean resources: vast dissolved load; economic extraction mainly of common salt, magnesium, bromine; manganese nodules on sea floor.

Rat-Hole Mining (Meghalaya)

– Family-run narrow tunnels for coal in Jowai & Cherrapunji.
– Declared illegal by National Green Tribunal (NGT) due to safety/environment hazards.

Geological Control of Indian Minerals

– Peninsular rocks = coal, metallics, mica, many non-metallics.
– Sedimentary belts (Gujarat, Assam) = petroleum.
– Rajasthan’s peninsular outcrops host many non-ferrous ores.
– Ganga-Brahmaputra alluvium almost mineral-free.

From Deposit ➞ Mine

Economic decision balances concentration, extraction ease, market distance.
Ferrous minerals (iron, manganese, etc.) ≈ $\tfrac{3}{4}$ of metallic value; India exports surplus after meeting domestic demand.

Iron Ore Basics

– Magnetite: up to $70\%$ Fe, excellent magnetic qualities.
– Hematite: $50–60\%$ Fe, bulk of industrial consumption.
– $97\%$ (2018-19) output from Odisha, Chhattisgarh, Karnataka, Jharkhand.

Major Iron & Manganese Belts

Odisha–Jharkhand Belt – Badampahar (Mayurbhanj, Kendujhar) + Gua & Noamundi (Singbhum).
Durg–Bastar–Chandrapur Belt – Bailadila range (Chhattisgarh); $14$ super-high-grade deposits; exports via Visakhapatnam.
Ballari–Chitradurga–Chikkamagaluru–Tumakuru (Karnataka) – Kudremukh: world-scale deposit, $100\%$ export; slurry pipeline to Mangaluru.
Maharashtra–Goa Belt – medium grade ores of Goa & Ratnagiri; exports through Marmagao.

Manganese

– Steel & ferro-manganese: $10 \text{ kg}$ Mn per $1 \text{ tonne}$ steel.
– Other uses: bleaching powder, insecticides, paints.
– 2018-19 output share: Madhya Pradesh $33\%$ , Maharashtra $27\%$ , Odisha $16\%$ , Karnataka $12\%$ , Andhra Pradesh $10\%$ , Others $2\%$ .

Non-Ferrous Overview

Copper, bauxite, lead, zinc, gold critical for electrical & engineering industries despite modest reserves.

Copper & Bauxite

Copper

– Properties: malleable, ductile, excellent conductor ➞ cables, electronics, chemicals.
– Key mines: Balaghat (M.P.), Khetri (Rajasthan), Singhbhum (Jharkhand).
– India is critically deficient in reserves.

Bauxite → Aluminium

– Bauxite (clay-like Al ore) forms via in-situ decomposition of Al-rich rocks.
– Aluminium strengths: lightweight + strong + conductive + highly malleable.
– Major deposits: Amarkantak plateau, Maikal hills, Bilaspur–Katni plateau, Koraput (Panchpatmali) in Odisha.
– 2018-19 production: Odisha $65\%$ , Jharkhand $10\%$ , Gujarat $9\%$ , Chhattisgarh $6\%$ , Maharashtra $6\%$ , M.P. $3\%$ , Others $1\%$ .

Non-Metallics, Limestone & Mining Hazards

Mica

– Splits into ultrathin elastic sheets (~ $1000$ layers ≈ few cm).
– Colours: clear, black, green, red, yellow, brown.
– Indispensable for insulation: high dielectric strength, low power loss, heat resistance.
– Major belts: Koderma–Gaya–Hazaribagh (Jharkhand), Ajmer (Rajasthan), Nellore (A.P.).

Limestone

– Calcium (\& magnesium) carbonate sedimentary rock.
– Core raw material: cement, flux in blast furnaces.

Why Chota Nagpur = “Storehouse”

– Ancient crystalline rocks, multiple igneous intrusions, intense metamorphism ⟶ concentration of metallic & mica minerals.

Mining Hazards

– Health: dust & fumes ⟹ pulmonary disease.
– Safety: roof collapse, inundation, fires (esp. coal).
– Environment: water contamination, land degradation, stream pollution via waste/slurry dumping.

Mineral Conservation

• Workable reserves < $1\%$ of crust; formation spans millions of years ➞ essentially non-renewable.
• Deeper, poorer ore ⟹ rising extraction cost.
• Strategies: planned & sustainable mining, advanced tech to use low-grade ore, metal recycling, adoption of substitutes.

Energy Resources Overview & Coal

Energy Classification

Conventional: firewood, cattle-dung cake, coal, petroleum, natural gas, hydel & thermal electricity.
Non-conventional: solar, wind, tidal, geothermal, biogas, atomic.

– Rural reality: > $70\%$ of household energy still firewood/dung ⟹ forest depletion & fertilizer loss.

Coal

Formation spectrum:

Peat (low carbon, high moisture).
Lignite (brown, soft; key reserve at Neyveli, Tamil Nadu).
Bituminous (most used; metallurgical subset for iron smelting).
Anthracite (highest carbon, hardest).

Geological Ages:
• Gondwana (> $200$ Ma) – Damodar (Jharia, Raniganj, Bokaro), Godavari, Mahanadi, Son, Wardha valleys.
• Tertiary (≈ $55$ Ma) – Meghalaya, Assam, Arunachal, Nagaland.

Industries & thermal plants usually sited near coalfields because coal is bulky and loses mass as ash.

Petroleum, Natural Gas & Electricity

Petroleum (Mineral Oil)

– Fuels (heat, light), lubricants, petrochemicals.
– Refineries act as nodal hubs for synthetics, fertiliser, chemicals.
– Trapped in anticlines/fault-traps within porous sandstone/limestone sealed by impervious layers.
– Major producing regions:
• Offshore: Mumbai High + adjacent fields (also Bassein, Aliabet).
• Onshore: Gujarat (Ankleshwar), Assam (Digboi, Naharkatiya, Moran-Hugrijan).

Natural Gas

– Associated with oil or independent.
– Uses: power, industry heat, feedstock (fertiliser, petro-chem), transport (CNG), domestic (PNG).
– Key reserves: Mumbai High, Cambay basin (W); Krishna–Godavari basin (E).
– Infrastructure: 1st HVJ pipeline $1700\text{ km}$ ; national grid now $18{,}500\text{ km}$ ➞ goal >34{,}000\text{ km}.

Electricity

– Per-capita use = development index.
– Generation routes:
• Hydel (renewable; e.g., Bhakra-Nangal, DVC, Kopili).
• Thermal (coal, oil, gas).
– Once produced, electrons are identical; difference lies only in source sustainability.

Nuclear & Thermal Power Plant Map

• Nuclear sites (6): Tarapur (MH), Rawatbhata (Raj), Kaiga (Kar), Kakrapar (Guj), Kalpakkam (TN), Narora (UP).
• Dense thermal clusters coincide with coal belts & ports.

Non-Conventional Energy Sources

Nuclear/Atomic

– Energy via atomic nucleus alteration.
– Fuel: uranium & thorium (Jharkhand, Aravalli Rajasthan; thorium-rich monazite sands Kerala).

Solar

– Abundant insolation; photovoltaic (PV) converts light → electricity.
– Expanding rural electrification & megawatt-scale solar parks reduce biomass dependence.

Wind

– Top cluster: Tamil Nadu (Nagarcoil ➞ Madurai).
– Other states: A.P., Karnataka, Gujarat, Kerala, Maharashtra, Lakshadweep.
– Famous sites: Nagarcoil, Jaisalmer.

Biogas

– Feedstock: shrubs, agri waste, animal/human waste.
– “Gobar gas” plants at household/co-op/municipal level.
– Dual gain: clean fuel + enriched slurry manure; curbs deforestation & dung burning.

Tidal & Geothermal; Energy Conservation

Tidal

– Floodgate dams across inlets; water head drives turbines during ebb flow.
– Suitable sites: Gulf of Khambhat, Gulf of Kachchh (Gujarat), Sunderban delta (W.B.).

Geothermal

– Utilises Earth’s geothermal gradient; hot groundwater becomes steam.
– Pilot plants: Parvati valley (Manikaran, H.P.), Puga valley (Ladakh).

Conservation Imperatives

– Rising multi-sector demand mandates sustainable path.
– Twin strategies: energy conservation + renewable adoption.
– India currently among least energy-efficient nations.

Practical citizen actions: public transport, switch-off habits, energy-efficient appliances, embracing renewables. “Energy saved is energy produced.”

Key Exercise Themes

• Know placer vs. vein vs. residual deposits.
• Crossword reinforces ferrous/non-ferrous lists, limestone, magnetite, anthracite, bauxite, copper, gypsum.
• Short-answer practice: mineral definition; need for conservation; formation in igneous/metamorphic; distribution of coal; solar prospects.

Recap Cheat-Sheet

• Ferrous = iron, manganese, chromite → core of metallurgy.
• Non-ferrous = Cu, Al (bauxite), Pb, Zn, Au → electrical/engineering.
• Non-metallic = mica, limestone, gypsum, potash, salt.
• Energy:
– Conventional: coal, oil, gas, hydel.
– Non-conventional: solar, wind, tidal, geothermal, biogas, nuclear.
• Conservation mantra: Reduce ⟶ Recycle ⟶ Replace.