| 11. | Many establishments were small and in particular there were a large number of shallow bell pits extracting coal.
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| 12. | The other early method used was the digging of bell pits with lateral tunnels, called drifts, following the vein.
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| 13. | It was previously exploited for coal resources which is evident by large sections having undulating surfaces caused by the sinking of bell pits.
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| 14. | When the Kendleshire golf course was built, the remains of many bell pits were found and there are probably many more in the area.
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| 15. | Mining was initially limited to bell pits until the arrival of steam engines, which along with improved ventilation, made possible much deeper pits.
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| 16. | The woodlands are situated on Coal Measures, and present in the woodlands are numerous bell pits, which have been used to provide coal.
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| 17. | The early mines would have been drift mines or adits where coal seams outcropped or by shallow bell pits where coal was close to the surface.
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| 18. | The remains of a number of mines and bell pits can be seen, including the former St Helen's Colliery on Moor Lane in Highburton.
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| 19. | Coal had been mined at Featherstone since the 13th century and remains of bell pits can still be seen to the north of Park Lane at North Featherstone.
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| 20. | Not all mines were deep underground; Bell pits were a cheap and easy way at getting at an ore that lay close to the surface of flat land.
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