The mine was designated a SSSI in 1993, is listed as of national importance in the Geological Conservation Review and is the world type locality for bayldonite.[2][3] It is noted as the most important site in Britain for secondary ore minerals of lead, copper, and arsenic and has had 40 mineral species recorded at the site.[2]
History
A new 36-inch cylinder pumping engine was built in 1880, by Messrs George Eustice and Cooper which drained between nine and ten fathoms of water in the first four hours of work.[4]