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