Giridih Coalfield is spread over an area of. It has 20 seams. The Lower Karhabari seam, thick, has the finest coking coal in India. Other important seams are Upper Karhabari and Bandhua seams. The reserves are estimatedat 17.3 million tonnes. The Giridih Coalfield is typical of Karhabari formation. It has low moisture, low ash content, low in sulphur and phosphorus. The coalfield is located around Beniadih, in Giridih block, south of Giridih.