This has resulted in the deeper seams, with good quality prime coking coal, to remain untapped.

Moreover, shallow deposits worked by primitive methods, in pre-nationalisation period, is leading to mining fire.

[2] Patherdih washery with an annual capacity of 1.6 million tonnes per year was commissioned in 1964.

Sudamdih washery with an annual capacity of 1.6 million tonnes per year was commissioned in 1981.

2.Bhowrah South colliery, with an underground mine, has a normative production capacity of 0.29 million tonnes per year and a peak production capacity of 0.377 million tonnes per year.

At Sudamdih and Patherdih collieries, all the quarries affected by fire and subsidence have been filled up.

Most of the affected area in Bhowrah (North) colliery has also been filled up with quarry overburden.