Coal – Formation, Classification and Distribution
Geography › Mineral and Energy Resources · Topic 21.2
Coal is a sedimentary fossil fuel formed from plant matter buried in swamps and compressed over millions of years. By carbon content it is classified as peat, lignite, bituminous coal and anthracite, and by use as coking coal for steel and thermal coal for power. About 98 per cent of India's coal is Gondwana coal, found in the river valleys of the Damodar, Son, Mahanadi and Godavari, and production passed one billion tonnes in 2024–25.
6 min read · UPSC Prelims · Geography · Mineral and Energy Resources
At a Glance
- Peat to anthracite Rising carbon, 40 to 95 per cent
- Gondwana coal About 98 per cent of India’s coal
- Coking coal Mostly Jharkhand, Jharia field
- Lignite Neyveli, Gujarat, Rajasthan
- Production 1,047.6 million tonnes in 2024–25
- Exam link UPSC Prelims, Geography: Mineral and Energy Resources
Where Does It Fit?
This is the second topic of the macro on mineral and energy resources. The previous topic covered iron ore, and this one covers the main energy mineral of India. The next topic covers petroleum. Previous topic: Iron Ore – Types and Distribution. Next topic: Petroleum – Formation and Distribution.
How Is Coal Formed and Classified?
In short: buried plants, heat and pressure turn peat into lignite, then bituminous coal and finally anthracite.
Most of the world’s coal was formed in the Carboniferous period, about 350 million years ago, when swampy forests covered large areas. Dead plants piled up in the swamp waters and were buried by sediments, and heat and pressure over millions of years removed oxygen and left carbon-rich coal, as in Dravidian and Aryan Rock Systems of India.
| Type | Carbon | Features | India |
|---|---|---|---|
| Peat | Below about 40 to 55 per cent | Partly decayed, very moist, smoky, low heat | Nilgiris, Kashmir valley |
| Lignite (brown coal) | 40 to 55 per cent | Over 35 per cent moisture; burns with spontaneous combustion | Neyveli in Tamil Nadu, Rajasthan, Gujarat, Kutch |
| Bituminous (black coal) | 40 to 80 per cent | Most widely used; high calorific value; used for coke and gas | Jharkhand, Odisha, West Bengal, Chhattisgarh, Madhya Pradesh |
| Anthracite | 80 to 95 per cent | Best, hardest; ignites slowly; burns with a short blue flame | Only in small amounts in Jammu and Kashmir |
Coking coal, or metallurgical coal, has high carbon and low ash, sulphur and moisture and is used to make coke for steelmaking, while thermal coal, or non-coking coal, has more ash and sulphur and is used for power and cement. Australia, Canada and the United States are the main producers and exporters of coking coal, and India imports it, as in Iron and Steel Industry – Process and Location Factors.
Where Is Coal Found in India?
| Group | Fields and states |
|---|---|
| Gondwana coal (about 250 million years old; about 98 per cent of reserves and 99 per cent of output) | Lower carbon than the Carboniferous coal of Europe because it is younger, with ash up to about 30 per cent; Damuda series (Lower Gondwana) gives about 80 per cent of production; occurs in river valleys of the Damodar, Son, Mahanadi, Godavari and Wardha |
| Jharkhand | Jharia, the best coking coal field; Bokaro, Giridih, Karanpura, Ramgarh, Auranga; more than 90 per cent of India’s coking coal |
| West Bengal | Raniganj, where the first coal mine opened in 1774 |
| Odisha | Talcher, with the Ib valley; power and fertiliser use; today Odisha is among the largest producers |
| Chhattisgarh | Korba, Hasdo-Arand, Chirimiri; thermal coal |
| Madhya Pradesh | Singrauli (shared with Uttar Pradesh), Pench-Kanhan, Sohagpur |
| Telangana and Andhra Pradesh | Singareni in the Godavari valley, the southernmost field, non-coking coal for south India |
| Maharashtra | Wardha valley, Kamptee |
| Tertiary coal (60 to 15 million years old) | Low carbon and high moisture and sulphur; Assam (Makum, high sulphur), Arunachal Pradesh, Meghalaya, Jammu and Kashmir; lignite of Tamil Nadu (about four-fifths of reserves), Gujarat and Rajasthan |
India has coal reserves of about 380 billion tonnes, with Jharkhand, Odisha and Chhattisgarh holding most. Production passed one billion tonnes for the first time in 2023–24 and reached a record 1,047.6 million tonnes in 2024–25, with a target of about 1.15 billion tonnes in 2025–26, while roughly three-quarters of the output goes to power plants, and coal provides about 70 per cent of the electricity. Coal India Limited is the largest producer, and commercial mining by private firms has been allowed since 2020. India also imports a large amount of coal, mainly coking coal for steel and high-grade thermal coal.
What Are the Present Issues?
- Climate and energy transition: coal is the largest source of carbon dioxide from India’s power sector, and India has committed to net zero by 2070 while building more renewable capacity, so coal use will peak in the coming decades.
- Quality and imports: Indian coal has high ash and low calorific value, so there is a continuing demand for imports and washing of coal.
- Coal gasification: a mission targets 100 million tonnes of gasification by 2030 to reduce imports of gas and chemicals.
- Environment and people: land loss, displacement, mine fires in Jharia, the pollution of air and water, and the need for a just transition for workers and districts that depend on coal, as in Mining and Quarrying.
- World: China produces and uses about half of the world’s coal, followed by India, with the United States, Indonesia, Australia and Russia.
As an analytical point, coal remains the backbone of Indian electricity at a time when its future is questioned, so the policy issue is to ensure supply for growing demand while shifting towards cleaner sources, for example by using more efficient plants, carbon capture research and more solar and wind power, and by planning for the communities of the coal belt.
Why Is This Topic Important?
- Facts Types and fields asked
- Current affairs Production and gasification
- Climate Transition
What Came Next?
The next topic describes the formation and distribution of petroleum. Next topic: Petroleum – Formation and Distribution.
Key People and Terms
- Gondwana coal Permian-onward Indian coal
- Lignite Brown coal
- Anthracite Hardest, highest carbon coal
- Coking coal Coal for steelmaking
- Thermal coal Coal for power
- Calorific value Heat energy per unit
Exam Corner
Points to Remember
- Order: peat, lignite, bituminous, anthracite.
- Jharia has the best coking coal.
- Raniganj: first mine, 1774.
- Neyveli is the lignite centre.
- Production passed 1 billion tonnes.
Do Not Confuse With
- Coking and thermal coal Steel versus power
- Gondwana and Tertiary coal 250 million versus 60 to 15 million years old
- Lignite and anthracite Lowest versus highest rank
Memory Hook
Peat, lignite, bitumen, anthracite: more carbon with age; Gondwana in the valleys, Jharia for coke.
Mains Angle
Questions ask for classification, distribution and transition issues. These points add depth.
- Quality Gondwana’s low carbon
- Use Power and steel
- Transition Just transition
A Question You May Face
An original practice question, not a past paper question.
“Describe the types and distribution of coal in India and discuss the role of coal in India’s energy transition.”
How to Answer
- Formation Swamp to coal.
- Types Four ranks.
- India Gondwana valleys.
- Transition Power, imports, climate.
GS Relevance
Frequently Asked Questions
How is coal formed?
Coal is formed from plant matter that accumulated in swamps, was buried by sediments and was changed over millions of years by heat and pressure, which removed oxygen and left a high proportion of carbon. Most of the world's coal formed in the Carboniferous period about 350 million years ago.
What are the types of coal?
Coal is classified by carbon content as peat, lignite, bituminous coal and anthracite. Peat has the least carbon and anthracite the most, with 80 to 95 per cent. Bituminous coal is the most widely used, and lignite is low-grade brown coal with high moisture.
What is the difference between coking and non-coking coal?
Coking coal, or metallurgical coal, has high carbon and low ash, sulphur and moisture, and is used to make coke for steelmaking. Non-coking or thermal coal has higher ash and sulphur and is mainly used to generate electricity and in cement and other industries.
What is Gondwana coal?
Gondwana coal is coal found in the Gondwana rock system, about 250 million years old, and forms about 98 per cent of India's coal reserves. It is younger than Carboniferous coal, so its carbon content is lower, and it is found in the Damodar, Son, Mahanadi and Godavari valleys.
Where are the major coalfields of India?
The major coalfields are Jharia, Bokaro and Karanpura in Jharkhand, Raniganj in West Bengal, Talcher in Odisha, Korba in Chhattisgarh, Singrauli in Madhya Pradesh and Uttar Pradesh, and Singareni in Telangana. Lignite is mined at Neyveli in Tamil Nadu and in Gujarat and Rajasthan.
PYQ Practice — Statement Analysis
1 Anthracite is the highest rank of coal.
It has 80 to 95 per cent carbon.
2 Most of India's coal is of the Carboniferous age.
It is Gondwana coal.
3 Raniganj is in West Bengal and had India's first coal mine.
It opened in 1774.
4 Neyveli is a lignite centre in Tamil Nadu.
It supplies power plants.
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