🪨 Coal, Limestone & Industrial Minerals

Coal — Singrauli Coalfield

Coal is UP's most economically significant mineral. The Singrauli coalfield in Sonbhadra district is the sole commercial coal-producing area in the entire state. It forms part of the larger Singrauli coal basin that extends into Madhya Pradesh.

The coalfield hosts the Singrauli Super Thermal Power Complex — one of the largest thermal power clusters in Asia. Multiple power stations operated by NTPC (Vindhyachal, Singrauli, Rihand) draw coal directly from nearby open-cast mines.

For exam understanding, coal in UP is less about scattered state-wide deposits and more about one concentrated energy geography: Sonbhadra-Singrauli.

Parameter	Details
Location	Sonbhadra district (bordering MP)
Coalfield	Singrauli coalfield
Coal Type	Bituminous (non-coking)
Reserve significance	Major coal reserve zone of UP
Mining Operator	Northern Coalfields Limited (NCL), a subsidiary of Coal India
Key Mines	Jayant, Dudhichua, Amlohri, Nigahi, Khadia
Power Stations	Vindhyachal (4,760 MW), Singrauli (2,000 MW), Rihand/Anpara

Exam Tip: Singrauli coalfield produces non-coking coal used for thermal power, not metallurgical/coking coal used in steel-making. NCL (Northern Coalfields Ltd) operates all mines here.

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Limestone — Cement Industry Backbone

Limestone is the most widely distributed mineral in UP's southern belt. It occurs abundantly in the Vindhyan rock formations across Mirzapur, Sonbhadra, and Banda districts.

Limestone Deposits by District

District	Notable Areas	Key Use
Mirzapur	Chunar, Robertsganj	Cement manufacturing
Sonbhadra	Dalla, Chopan	Cement, chemical industry
Banda	Babina, Kalinjar	Building material, lime
Chitrakoot	Manikpur area	Local construction

The town of Chunar (Mirzapur) has long been associated with limestone. The Dalla cement area in Sonbhadra is one of UP's most important limestone-to-cement industrial links.

UP's limestone is commonly discussed in two broad categories for exams: cement-grade and industrial/chemical-grade.

Industrial Applications

• Cement manufacturing — primary consumer (~70% of production)
• Chemical industry — calcium carbide, soda ash
• Iron and steel — flux in blast furnaces
• Agriculture — soil amendment for acidic soils
• Construction — building stone, lime mortar

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Silica Sand & Glass Sand

UP is an important state for silica sand (glass sand). The best-known deposits are concentrated around Shankargarh and Karchana in Prayagraj district.

This silica sand feeds one of India's most famous glass centres — the Firozabad glass industry. For exams, the strongest memory link is simply: Shankargarh supplies, Firozabad manufactures.

Parameter	Details
Key Deposits	Shankargarh, Karchana (Prayagraj)
SiO₂ Content	95–99% (high purity)
Primary Consumer	Firozabad glass industry
Other Uses	Ceramics, foundry casting, water filtration
Reserve importance	Major industrial raw material source

Exam Tip: The connection between Shankargarh silica sand and Firozabad glass bangles is a frequently tested fact. Remember: Shankargarh supplies, Firozabad manufactures.

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Dolomite

Dolomite (calcium magnesium carbonate) is found in the Vindhyan formations of Sonbhadra and Mirzapur districts. It often occurs alongside limestone deposits.

Parameter	Details
Chemical Formula	CaMg(CO₃)₂
Locations	Sonbhadra (Robertsganj), Mirzapur
Uses	Steel industry (flux), refractory bricks, fertilizer filler

Dolomite from UP is transported to steel plants in eastern India and is also used locally in the cement industry as a raw material blend.

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Gypsum

Gypsum deposits in UP are found primarily in the western districts, particularly in areas bordering Rajasthan. While UP's gypsum reserves are modest compared to Rajasthan (India's largest producer), they serve local demand.

Parameter	Details
Chemical Formula	CaSO₄·2H₂O
Location	Western UP (bordering Rajasthan)
Primary Use	Cement additive (retarder), plaster of Paris
Other Uses	Soil amendment for usar/alkaline soils, fertilizer

Gypsum plays a dual role in UP — industrially as a cement ingredient, and agriculturally as a reclamation agent for usar (alkaline/sodic) soils that plague large tracts of central and eastern UP.

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Building Stone & Sandstone

The Vindhyan sandstone from Mirzapur, Sonbhadra, and Banda is one of UP's most commercially valuable minor minerals. This reddish-brown to buff sandstone has been used in construction for centuries — from Mughal-era monuments to modern buildings.

Variety	Source	Characteristics
Red Sandstone	Mirzapur, Banda	Used in heritage construction
Buff/Yellow Sandstone	Chitrakoot, Banda	Decorative, export quality
Flagstone	Vindhyan belt	Flooring, paving

Sandstone quarrying is a significant source of employment in the Vindhyan region, though it raises environmental concerns related to deforestation and habitat destruction.

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Industrial Linkages

The minerals of southern UP form an interconnected industrial ecosystem:

Mineral	Industry Fed	Location of Industry
Coal	Thermal power	Singrauli complex
Limestone	Cement	Chunar, Dalla
Silica Sand	Glass	Firozabad
Dolomite	Steel (flux)	Transported to eastern India
Sandstone	Construction	Pan-India, export
Gypsum	Cement + Agriculture	Western and central UP

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Summary Cheat Sheet

Mineral	Key District	Key Fact
Coal	Sonbhadra	Singrauli coalfield, NCL, non-coking
Limestone	Mirzapur, Sonbhadra	Chunar, Dalla — cement link
Silica Sand	Prayagraj	Shankargarh -> Firozabad glass, high purity
Dolomite	Sonbhadra, Mirzapur	Steel flux, refractory use
Gypsum	Western UP	Cement retarder + usar soil treatment
Sandstone	Vindhyan belt	Heritage and modern construction