Mining activity in Bihar is:

Large-scale and contributes significantly to the state's economy
Mostly small-scale with some larger operations
Primarily focused on precious metals extraction
Nearly non-existent due to depletion of resources

The correct answer is: b) Mostly small-scale with some larger operations.

Mining activity in Bihar is mostly small-scale with some larger operations. The state is home to a number of mineral deposits, including coal, iron ore, bauxite, and limestone. However, the mining industry in Bihar is not as developed as in other parts of India. This is due to a number of factors, including the lack of infrastructure, the remoteness of some of the mining areas, and the environmental impact of mining.

Despite these challenges, the mining industry in Bihar is still an important part of the state’s economy. In 2017-18, the mining sector contributed about 2% to the state’s GDP. The sector employs about 1.5 million people, directly and indirectly.

The government of Bihar is taking steps to develop the mining industry in the state. The state government has set up a mining development corporation to promote investment in the sector. The government is also working to improve the infrastructure in mining areas and to address the environmental concerns associated with mining.

The mining industry in Bihar has the potential to play a major role in the state’s economic development. However, the sector faces a number of challenges that need to be addressed. The government of Bihar is taking steps to address these challenges and to develop the mining industry in the state.

Option a) is incorrect because mining activity in Bihar is not large-scale. The mining sector in Bihar is mostly small-scale with some larger operations.

Option c) is incorrect because mining activity in Bihar is not primarily focused on precious metals extraction. The state is home to a number of mineral deposits, including coal, iron ore, bauxite, and limestone.

Option d) is incorrect because mining activity in Bihar is not nearly non-existent due to depletion of resources. The state is home to a number of mineral deposits, including coal, iron ore, bauxite, and limestone.