Polberro Mine was one of the richest and the deepest in the St Agnes area. It was well known for producing a very high grade of ore called Diamond Tin, this was so pure that it required little or no processing so it could be sent directly from the mine to the smelters. Like many other Cornish Mines Polberro was an amalgamation of several smaller mines which had worked as individual concerns such as Wheal’s: Kine, Pell, Turnavore, Prosper, Park and Squidler .
The mine was operational as far back as the 1730’s, its boom time of production was from the mid 1830’s when production peaked at around 30 tons of Tin a month, at this time there were around 450 persons employed. In 1846 the mine was visited by Queen Victoria, from then it was known as Royal Polberro Consols. The price of Tin dropped in the 1870’s causing the closure of many mines in the area including Polberro. A re-working in 1886 dates the surviving engine house on Turnavore shaft which housed a 60″ pumping engine. The mine again closed in 1895 after a merger with Trevaunance Mine. In 1937 a final re-working was attempted, new extensive dressing floors were installed and the engine house was converted for use as the miners dry, the shaft here was deepened reaching a final depth of 182 fathoms making it the deepest mine in St Agnes. The mine closed for the last time in 1941, ending all mining activity in the St Agnes area.
The engine house is in good condition still retaining its roof, the bob wall has been bricked in and the windows are gothic in character some still with the frames in place.
The images on this page were taken in the mid 1990’s, the area is now on private land.
As I have already stated this property is on Private Land and should not be entered.