sentences:  The centre is built within the structures of the former quarrying village Porth y Nant, which was abandoned midway through World War II after the cessation of quarrying.The quarry named Nant Gwrtheyrn opened in 1861, and was serviced by a village called Porth y Nant, on the site of the current language centre.Nant Gwrtheyrn produced setts used for road surfacing.