Ores

Introduction

An ore is a naturally occurring mineral from which a metal can be profitably extracted.
Not all minerals are ores, but all ores are minerals.
In Bihar, ores like bauxite, pyrite, and mica play a role in mining economy and industry.

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What is an Ore?

• A mineral that contains a valuable metal in concentrated form
• Must be economically viable for extraction
• Undergoes crushing → concentration → extraction → purification
• Ore ≠ Metal: Ores are chemical compounds (often oxides, sulphides, carbonates)

📝 PYQ (BPSC): What is an ore? → Mineral from which metal is profitably extracted
📝 Expected MCQ: Ore contains? → Metal in concentrated form

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Common Ores and Their Metals

📝 Expected MCQ: Ore of aluminium is? → Bauxite
📝 Expected MCQ: Galena is ore of? → Lead

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Ores in Bihar – State-Specific Applications

🏞️ Natural Resources

• Bauxite (Aluminium ore) found in Rohtas and Munger
• Pyrite (source of Sulphur) found in Amjhore, Rohtas
• Mica deposits in Nawada, Gaya, and southern Bihar
• Small reserves of iron ore in districts near Jharkhand border

🏭 Industrial Use

• Bauxite from Bihar sent to aluminium plants in Jharkhand
• Mica extracted for use in electrical insulation, cosmetics, paints
• Pyrite used in fertilizer and sulphuric acid industries

📈 Economy & Policy

• Bihar Mines and Geology Department regulates ore exploration
• Bihar promotes mineral-based MSMEs (tiles, wires, ornaments)
• Ores also used in stone crushing, cement, and railway material units

📝 Expected MCQ: Bauxite is found in which Bihar district? → Rohtas
📝 Expected MCQ: Which mineral from Bihar is used in paints and cosmetics? → Mica

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Ore Extraction Processes

• Concentration: Removal of impurities
• Calcination: Heating in absence of air (for carbonates)
• Roasting: Heating in presence of air (for sulphides)
• Reduction: Metal extracted using heat or chemical agents

📝 Expected MCQ: Which process is used for sulphide ore? → Roasting
📝 Expected MCQ: Ore of copper is? → Copper pyrite

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Important Concepts

✔️ Mineral

Naturally occurring inorganic substance with definite chemical composition.

✔️ Ore

A mineral from which metal is extracted profitably.

✔️ Gangue

Unwanted impurities in ore (e.g., sand, clay).

📝 Expected MCQ: What is gangue? → Impurities in ore

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PYQs + Expected MCQs

📝 PYQ (BPSC): Which mineral is found in Nawada, Bihar? → Mica
📝 PYQ (CDPO): What is the ore of aluminium? → Bauxite
📝 Expected MCQ: Which process removes impurities from ore? → Concentration
📝 Expected MCQ: Which mineral is used to obtain sulphur? → Pyrite
📝 Expected MCQ: Which district of Bihar has bauxite deposits? → Rohtas
📝 Expected MCQ: Mica is used in? → Electrical appliances

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Quick Revision Points

• Ore = economically useful mineral
• Bauxite → Aluminium, Hematite → Iron
• Bihar ores: Bauxite (Rohtas), Pyrite (Rohtas), Mica (Gaya, Nawada)
• Extraction steps: Concentration → Roasting/Calcination → Reduction
• Gangue = unwanted impurities
• Pyrite = used in fertilizer + sulphur industry

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Sources Used

• NCERT Class 8–10 Science
• Lucent GK – Geography & Chemistry Sections
• Drishti Science Quick Book
• EduTeria + Ghatna Chakra PYQs (BPSC, CDPO, DPRO)
• Bihar Mines & Geology Dept – Resource Reports
• Bihar Industrial Policy 2022
• Geological Survey of India – Bihar Mineral Map