Evidence remains of the small-scale chalk quarrying that occurred prior to the Industrial Revolution, including chalk pits both at Warren Farm and close to the Burford Bridge Hotel. The opening of the Dorking to Reigate railway line at the bottom of the hill in 1849, enabled new quarry faces to be opened at Brockham and Betchworth. Sidings were provided adjacent to the main line and there was an extensive network of narrow-gauge railway tracks at both sites. The Brockham Limeworks closed in 1935, however a battery of eight kilns (dating from 1870) still stands and is Grade II listed. The larger Betchworth Quarry and Lime Kilns (approximately 1 km to the east) closed in 1960 and a variety of different kiln types have been preserved and protected with a Grade II listing. The two sites have been designated as Nature Reserves and are managed by Surrey Wildlife Trust. A wide range of bat species now roost in the former kilns.