Slate industry in Spain keep cutting machinery cool. After quarrying regional authorities often dictate that the landscape is returned as much as possible to its original state, and waste rock left as part of the extraction process is returned adjacent to the quarry Slate industry in Spain 90% of Europes's natural slate used for roofing originates from the slate industry in Spain, with the region of Galicia being the primary source of production. Slate is a fine-grained metamorphic rock that splits into thin, smooth-surfaced layers. Metamorphic rock is rock which was once igneous or sedimentary and has been subsequently subjected to heat and pressure
Aberllefenni Slate Quarry Aberllefenni Slate Quarry Aberllefenni Slate Quarry is the collective name of three slate quarries, Foel Grochan (sometimes misspelt as Foel Crochan), Hen Chwarel and Ceunant Ddu, located in Aberllefenni, Gwynedd, North Wales. It was the longest continually operated slate mine in the world until its closure in 2003. Foel Grochan is the quarry on the eastern side of the valley, facing Ceunant Ddu and Hen Gloddfa on the west; all three were worked as a single concern throughout their history. Technically all three of these are mines, not quarries, since all rock extraction takes place underground, though they are often