| 21. | There are also headworks on some of the mine shafts.
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| 22. | Microbats rest in the gold mine shafts during the day.
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| 23. | The company is scaling back and in some cases closing unprofitable mine shafts.
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| 24. | Some live underground in old mine shafts which they have converted into homes.
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| 25. | Twelve-year-olds toiling in sweat shops and rickety mine shafts.
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| 26. | Poorly ventilated mine shafts make it easier for dangerous methane buildups to occur.
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| 27. | It said they were trapped in a disused mine shaft that collapsed Sunday.
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| 28. | Forty-nine miners were underground when the mine shaft flooded Sunday morning.
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| 29. | Many of these were former mine shafts that were turned into defense positions.
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| 30. | The first underground mine shaft in Indiana was sunk in Newburgh in 1850.
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