It's dark down there! Croesor slate mine in north Wales was served by the Croesor Tramway. Small scale quarrying began in the 1840s, and by 1861, there were two companies in operation. They amalgamated in 1865, a year after the quarry was connected to the newly opened Croesor Tramway. Much money was invested in development work, but volumes of useful slate produced were small, amounting to just 226 tons in 1868. Access to the underground workings was by a single adit, and the surface mill was powered by two water wheels. A change of ownership in 1875 did little to improve the profitability of the quarry, and it closed in 1878 or 1882.
Croesor Quarry is connected to the nearby Rhosydd Quarry by a tunnel that was built to aid surveying and settle boundary disputes. Apart from Chamber 1 East, a huge chamber in which the roof has collapsed, most of the accessible mine is in reasonable condition.Below the adit level, the mine is flooded and inaccessible. In spite of a series of collapses, particularly in the Rhosydd Quarry, thi video shows an underground journey from Croesor to Rhosydd is still possible and is considered to be a classic trip for mine explorers. Fixed ropes, home-made suspension bridges, zip wires, and inflatable boats have been installed which make it possible to complete the journey, although not necessarily in safety.
https://en.wikipedia.org/wiki/Croesor_Quarry
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#Snowdonia #outdoor #activities #travel #mine_trip #Cnicht_to_Rhosydd_Through_Trip