Westbury Brook mine was established in 1837 by the Dowlais Company and ceased operations in 1893. During its active years, it produced nearly a million tons of iron ore. The mine operated on four levels: Levels 1 and 2 were accessed from the Old shaft, which was 360 feet deep, while Levels 3 and 4 were driven from the deeper Westbury Brook Shaft, reaching a depth of 670 feet. Presently, only the first and second levels are accessible, as the third and fourth levels remain permanently flooded. Although the Old shaft was filled in during the 1960s, the Westbury Brook shaft is capped with concrete and features an access hatch. Adventurous individuals can choose to abseil down 400 feet to the water and then prussik back up. The provided grid reference is for the large scowle hole at SO 66260 16505, commonly utilized by cavers to enter the system.

1864-1890 Dowlais Iron Co.