| 31. | The settlement site was destroyed when around eight million tonnes of coal were extracted by opencast mining between 1982 and 1996.
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| 32. | Operated by DBS coal is also supplied from the Tower Opencast mine based at the site of the original Tower Colliery.
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| 33. | Long drainage adits were dug into one of the hills at Dolaucothi, after opencast mining methods were no longer effective.
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| 34. | Such methods could be very effective in opencast mining, but fire-setting was very dangerous when used in underground workings.
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| 35. | The opencast mine that opened in the village in the late 1980s became the biggest mine in Europe by the early 1990s.
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| 36. | In response to ecosystem disturbances, some opencast mining sites have utilized earthworms to prepare soil for the return of native flora.
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| 37. | In 1972, a section of the line from to Waenavon was relaid by the National Coal Board for opencast mine workings.
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| 38. | Copper, iron ore and tin were mined and crafted in early times, brickworks and opencast mining provided employment in later years.
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| 39. | The average life of an opencast mine was around 18 months, after which time the land was restored to its former use.
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| 40. | Close to its source at Heald Foot, the water is polluted by the remains of past opencast mining activities and a landfill site.
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