| 21. | When gold was found drift mining began.
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| 22. | Mining in the coalfield continued after the opening of a drift mine in 1946 through until 1967.
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| 23. | In Shropshire, the gauge was usually narrow, to enable the wagons to be taken underground in drift mines.
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| 24. | Moulds from this shaft were used to create the'coal'for the Museum's underground drift mine experience,'Into the Thick '.
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| 25. | SM & HCC also operated a drift mine in the Stanley Burn valley to the north of Woodside Terrace.
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| 26. | Drift mining and hydraulicking were both abandoned in the 1930s as there were no dumping facilities for mining waste.
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| 27. | Commercial development of the drift mine began in 1905 and the first coal was shipped on January 4, 1906.
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| 28. | The moors and common land around Storrs was pot clay drift mine at Load Brook, two km to the west.
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| 29. | Almost all the gold was found at the base of Quaternary gravels, but some drift mines were worked in Tertiary gravels.
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| 30. | On 13 October 1882, Galt's company North Western Coal and Navigation Company opened the first drift mine across from Sheran's operation.
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