31. Long drainage adits were dug into one of the hills at Dolaucothi, after opencast mining methods were no longer effective. 32. In 1972, a section of the line from to Waenavon was relaid by the National Coal Board for opencast mine workings. 33. Copper, iron ore and tin were mined and crafted in early times, brickworks and opencast mining provided employment in later years. 34. In response to ecosystem disturbances, some opencast mining sites have utilized earthworms to prepare soil for the return of native flora. 35. The settlement site was destroyed when around eight million tonnes of coal were extracted by opencast mining between 1982 and 1996. 36. The fully motorized Krupp 288 Bucket Wheel Excavator ( as used on large opencast mining ) is complete with auxiliary conveyors. 37. Operated by DBS coal is also supplied from the Tower Opencast mine based at the site of the original Tower Colliery. 38. The opencast mine that opened in the village in the late 1980s became the biggest mine in Europe by the early 1990s. 39. It is a working opencast mine located in Arngill Beck on the north-east flank of Close House Crags, in the Lunedale Forest. 40. The average life of an opencast mine was around 18 months, after which time the land was restored to its former use.
