| 31. | In the United Kingdom coal is mined from 3 deep mines and 26 surface mines.
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| 32. | By the 1960s, the deep mines had closed.
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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. | The last deep mine in South Wales closed when the coal was exhausted in January 2008.
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| 35. | A number of deep mines were constructed throughout the area including Llay, Gresford, Bersham and Johnstown.
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| 36. | One deep mine was to be dug five miles ( 8 kms ) from Belvoir Castle.
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| 37. | Deep mines were not required at first so there were a large number of small operations.
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| 38. | Deep mining, they add, will eventually go global.
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| 39. | With falling air pressure, gases trapped within the coal in deep mines can escape more freely.
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| 40. | Deep mining ceased in 1965 with the closure of Foxfield Colliery by the National Coal Board.
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