Q1. [3] medium thorough-understanding
Gondwana coalfields and tertiary coalfields are both found in India, yet they differ greatly in age, location and type of coal. Compare the two, explaining where each is found and what makes Gondwana coal particularly significant for industry.
Generated by claude-sonnet-4-6 · 2026-06-26 13:34 · grounding rag
Model Answer
Gondwana Coalfields:
- Age: Over 200 million years old
- Location: Damodar Valley (West Bengal–Jharkhand) — Jharia, Raniganj, Bokaro; also Godavari, Mahanadi, Son and Wardha valleys
- Type: Mainly metallurgical (bituminous) coal, which is high-grade and used for smelting iron in blast furnaces
Tertiary Coalfields:
- Age: About 55 million years old
- Location: North-eastern states — Meghalaya, Assam, Arunachal Pradesh and Nagaland
- Type: Lower-grade coal
Significance of Gondwana Coal: Gondwana coal is metallurgical coal — essential for iron and steel industry. Its high carbon content and great age make it India's most industrially valuable coal resource.
Source: Conventional Sources of Energy, chapter 5
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Explanation
- Examiners expect a clear comparison covering age, location, and type for both coalfields — tabular or point format saves time and earns full marks.
- The key phrase examiners look for is "metallurgical coal" and its use in blast furnaces — this directly answers why Gondwana coal is industrially significant.
- Avoid writing general facts about coal formation; focus only on what the question asks.