Dorothea quarry
Turner's son took over as manager and renamed the quarry Dorothea, apparently after the wife of the landowner Richard Garnons.Profits began to fall in the 1840s, and in April 1848 the quarry was put up for sale, with 22 years remaining on the lease.[1] It was the largest quarry in the area, employing 200 men and producing 5,000-6,000 tons of finished slate a year.No buyer was found, instead John Williams of Denbighshire gradually bought out many of the existing shareholders, and by 1879 he had amassed more than 70% of the shares.[3] The quarry sits at the bottom of the wide Nantlle valley and consists of six pits, the deepest dropping 106m from the surface.