Introduction:
India is rich in mineral resources, and various mineral belts are spread across the country. Among these mineral belts, the richest one is the northern-eastern plateaus. This region is known for its vast reserves of minerals, which contribute significantly to the country's economy.

Explanation:
The northern-eastern plateaus, also known as the Chota Nagpur Plateau, is located in eastern India and covers parts of Jharkhand, Chhattisgarh, and Odisha. This region is one of the most mineral-rich areas in India and is often referred to as the "Ruhr of India" due to its extensive mineral resources.

Key minerals:
The northern-eastern plateaus are known for the abundance of various minerals. Some of the key minerals found in this region include:

1. Coal: The region is home to vast coal reserves, making it one of the largest coal-producing areas in India. The coalfields in Jharkhand and Chhattisgarh are a significant source of thermal and coking coal.

2. Iron Ore: The plateaus are also rich in iron ore deposits, with major reserves located in Odisha and Jharkhand. These iron ore deposits are vital for the steel industry and contribute significantly to India's iron and steel production.

3. Bauxite: The region is known for its extensive bauxite deposits, particularly in Odisha. Bauxite is the primary source of aluminum and is crucial for the production of various aluminum products.

4. Mica: The northern-eastern plateaus are also known for their abundant mica reserves. Jharkhand and Bihar are the major producers of mica in India.

5. Copper: The region also has significant copper deposits, particularly in Singhbhum district of Jharkhand. Copper is essential for electrical wiring and the production of various electrical appliances.

6. Uranium: The plateaus also host substantial uranium reserves, primarily in Jharkhand and Meghalaya. Uranium is a crucial mineral for nuclear power generation.

Economic significance:
The mineral resources in the northern-eastern plateaus play a vital role in India's economy. The coal reserves fuel the energy sector, providing power for industries and domestic consumption. Iron ore and steel production contribute to the manufacturing sector, while bauxite and copper are essential for various industries. These minerals also generate employment opportunities and contribute to the overall development of the region.

Conclusion:
The northern-eastern plateaus in India are the richest mineral belt in the country. With abundant reserves of coal, iron ore, bauxite, mica, copper, and uranium, this region is crucial for the Indian economy. The exploitation of these resources not only fuels industrial growth but also contributes to employment generation and overall development.