31. There are no deep mines operating in Van Lear proper, although some mines operate nearby. 32. Major growth came in the mid-19th century, with the development of deep mining . 33. From 1997 until 2003 he was the director of the Pennsylvania Bureau of Deep Mine Safety. 34. Deep mining ceased in 1965 with the closure of Foxfield Colliery by the National Coal Board.35. The last deep mine in South Wales closed when the coal was exhausted in January 2008. 36. In December 1915, 250th Tunnelling Company began work on the deep mine at Petit Bois. 37. Extensive deep mining took place in the watershed of Rausch Creek in the early 20th century. 38. We believe the closing of this is the beginning of the end of the deep mining industry. 39. "It's fair to say the deep mine rescuers will be ready," 40. With falling air pressure, gases trapped within the coal in deep mines can escape more freely.
