Barnclose Quarry at Leigh-on-Mendip was opened by Western Trinidad Lake Asphalte Co. (a subsidiary of Limmer & Trinidad Ltd.) in 1931. Some of the stone from the new quarry was said by the company to be required for a large road-making contract in Wiltshire.
The company would go on to manufacture blocks of mastic asphalt at the quarry (cast into moulds using a mixture of asphalt and limestone dust). In the late 1940s production of blocks at Barnclose ceased and a purpose built plant with railway sidings opened alongside the Wells to Witham line at Wanstrow.
Western Trinidad were granted an IDO for Barnclose (L.27) on 30 June 1948. Barnclose was acquired by Hobbs Quarries Ltd in 1968. In 1970 the quarry had a small crushing and screening plant with asphalt plant. By then the older part of the quarry had been abandoned and was flooded with water. The quarry seems to have closed in the 1970s.
NGR: 369273 - 147725
Lat : 51.22767467
Long : -2.44144383