Explanation:

Singhbhum was a district of India during the British Raj, part of the Chota Nagpur Division of the Bengal Presidency. It was located in the present-day Indian state of Jharkhand. Chaibasa was the district headquarters. Located in the southern limit of the Chota Nagpur Plateau, Singhbhum included the Kolhan estate located in its southeastern part. The district has been divided into three smaller districts, being East Singhbhum, West Singhbhum and Saraikela Kharsawan all are present in Jharkhand state of India. This district of Jharkhand is one of the leading producer of Copper in India