Neyveli, Singareni, Korba and Singrauli are mines, which produce

Neyveli, Singareni, Korba, and Singrauli are all prominent coal mining centers in India. Each represents a significant hub for the country's energy production:

• Neyveli (Tamil Nadu) is famous for its massive deposits of lignite (brown coal).
• Singareni (Telangana) is located in the Godavari Valley and is a major source of Gondwana coal.
• Korba (Chhattisgarh) is one of India's most important coalfields, feeding several large thermal power plants in the region.
• Singrauli (Madhya Pradesh and Uttar Pradesh) is often referred to as the "Energy Capital of India" due to its extensive coal reserves and concentration of power stations.

While India produces mica, iron ore, and bauxite in other regions (like Nellore, Bastar, and Panchpatmali respectively), the four sites mentioned in the question are specifically synonymous with coal mining.