It lends its name to Gwennap Pit, where John Wesley preached eighteen times between 1762 and 1789, although Gwennap Pit is about  to the northwest, at the hamlet of Busveal near St Day. The pit was caused by mining subsidence in the mid-18th century.
It is designated after Gwennap Pit, where John Wesley preached eighteen times between 1762 and 1789, whereas Gwennap Pit is located to the northwest, at the hamlet of Busveal near St Day. The pit was caused by mining subsidence in the mid-18th century.