But a more terrible disaster occurred in October 1899, when a series of landslips carried away houses and broke up the hill railway.
Passages obstructed by landslips.
(From Photographs by C. Evans.) In a very few years, however, the open pit mining was rendered impossible by the mud rushes, by the falls of the masses of barren rock known as " reef," which were left standing in the mine, and by landslips from the sides, so that in 1883, when the pit had reached a depth of about 400 ft., mining in the Kimberley crater had become almost impossible.
These interior landslips, besides choking the pipes and breaking the communication, often produce sinkings at the surface.