50°08′29″N 5°25′37″W / 50.1414°N 5.4269°W
Penberthy Croft Mine, is a disused mine and Site of Special Scientific Interest (SSSI) in Cornwall, England, UK. It is located to the north of the civil parish of St Hilary, 5 miles (8.0 km) east of the town of Penzance.[1]
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]