| 31. | Energy leases in the San Juan Basin date from the 1950s and 1960s, long before coal beds were explored for natural gas.
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| 32. | The Pittsburgh coal bed formed during a hiatus in active clastic deposition that allowed for the development of a huge peat mire.
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| 33. | Such explosions are common in China and are usually caused by the buildup of natural gas seeping out of the coal bed.
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| 34. | The Pleasant Valley Coal Company sank a 105-foot shaft in Coalville in 1895, employing 100 men to mine a 6-foot coal bed.
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| 35. | The Black Diamond mine, near the south end of the West Seventh Street Bridge, sank a mine shaft to reach a coal bed.
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| 36. | Explosions are common and often are blamed on a lack of ventilation to clear natural gas that seeps out of the coal bed.
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| 37. | Beginning about 1830, shallow wooden boats loaded with coal be drifted over the Upper Falls and Lower Falls and on down the river.
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| 38. | In the process of absorption the coal releases previously absorbed methane, and the methane can be recovered ( enhanced coal bed methane recovery ).
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| 39. | The Rockies'natural gas reserves often are in the form of coal bed methane, or naturally occurring gas trapped in coal beds by water pressure.
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| 40. | Explosions are common and often are blamed on a lack of ventilation equipment to clear natural gas that seeps out of the coal bed.
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