John Wesley preached here first in 1762 and spoke here on nearly all his subsequent visits to Cornwall. It was originally much larger, having been a sunken mine. Wesley gives estimates of up to 32,000 people listening to him and seldom less than 20,000, but it is likely that he vastly overestimated the area of the pit. What can be said for sure is that a lot of people heard him here.
Gwennap Pit is in fact in Busveal and is three miles from Gwennap. The reason for the name is because the owner of the land was heavily involved with the parish church in Gwennap.