Gwennap (Cornish: Lannwenep) is a village and civil parish in Cornwall, England, United Kingdom. It is about five miles (8 km) southeast of Redruth.In the 18th and early 19th centuries Gwennap parish was the richest copper mining district in Cornwall, and was called the "richest square mile in the Old World". It is the location of the Great County Adit, and once-famous mines such as Consolidated Mines, Poldice mine and Wheal Busy.