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Oct 26, 2017· A total of three slate veins run underneath this area of midWales. The point where these veins cross is where the quarry Bryn Eglwys is located. The biggest of the them all is the "Broad Vein". Measuring 600 feet wide, this vein is found in the north side of the site. It is filled with shale and patchy layers of a hard, durable of slate.