Tywarnehayle Mine, Cornwall

Tywarnehayle mine commenced working as Wheal Rock c1750, was renamed United Hills in 1809, and again as Tywarnehayle. From 1907 it was used as London's Royal School of Mines training mine, specialising in surveying and timber preservation. There are several surviving engine houses. At SW 6975 4726 is Taylor's pump engine house with a detached stack. The building housed a 58-inch diameter wooden beam engine, the last to be built in Cornwall. In 1906 the first electric pump to be used on a Cornish mine was installed here. Also present at SW 6999 4722 is John's pump engine house which was built in 1861 to house a 70-inch diameter engine. The engine was moved to Wheal Uny in 1864.