The Neolithic settlement at Carn Brea was a tor enclosure occupied between around 3700 and 3400 BC. Roger Mercer directed archaeological excavations of the site in 1970. and 1972. A two-acre inner enclosure was surrounded by one of eleven acres. The ramparts consisted of stone walls with an earth bank and ditch. Traces of fourteen platforms on which would have stood Neolithic long houses have been found within its ramparts, along with pottery and flint artefacts. The settlement had an estimated population of 100 to 150. There is evidence that the occupants cleared the surrounding land for farming by burning away the undergrowth and removing stones although the acid soil obliterated any environmental evidence. Nearby outcrops of rock suitable for making axes would have contributed to the village's economy. Edge grinding stones, blanks and incomplete and finished axes found on the site indicate the inhabitants were accomplished stoneworkers and traded their products. Pottery found on the site appears to have been made from gabbroic clay originating nearly 20 miles to the south in the present day parish of St Keverne suggesting a complex economic network in the area. Over 700 flint arrowheads were found scattered at the site. Despite nineteenth-century destruction, there was a concentration of arrow heads around a probable entrance to the enclosure, Mercer's site E. These arrows may have been used by a large group of archers in an organized assault upon a defended site. Every timber structure on the site had been burnt, and charcoal was the only organic matter that survived the acid soils. The earthworks may have been deliberately damaged by invaders.
In the Iron Age the site was reoccupied and minerals were mined from the hillside. One hut floor was excavated, and sherds of characteristically Iron Age types, including 'cordoned ware', were found. The fortified gateway, Mercer's Site G, was of Iron Age form, and Mercer suggests that although Site G produced no Iron Age artifacts, it is post-Neolithic. The crushed-rock road surface showed little sign of contemporary wear and could never have been subjected to even a modicum of traffic. A hoard of Gallo-Belgic gold staters originating from northeastern Gaul and Kent were found in the 18th century. The Ravenna Cosmography, of around AD 700, refers to Purocoronavis, 'a fort or walled settlement of the Cornovii'.
Landmarks
; Carn Brea Castle Carn Brea Castle stands near the top of the hill. It is built on the site of a chapel built in 1379 probably dedicated to St Michael. It was built in the 18th century by the Basset family as a hunting lodge. It is considered to be a folly built on the huge uncut boulders that make up part of its foundations, giving the impression of the building melting into the land. An East India trading ship named after Carn Brea Castle, was wrecked off the Isle of Wight in 1829 and involved in excise tax fraud. In the 1980s the abandoned building was converted into a Middle Eastern cuisine restaurant. The stolen Ford Anglia featured in the Harry Potter films was found at the castle in 2006. ; Basset Monument At the highest point of the hill is a 90-feet high Celtic cross erected as a monument to Francis Basset, 1st Baron de Dunstanville and Basset. Basset, a mine owner, gained his titles for erecting earthworks to defend Plymouth from combined French and Spanish fleets in 1779, and suppressing a miners' "food riot" in 1785. Along with others, he petitioned the House of Lords against slavery in 1828. The monument was erected by public subscription in 1836. It is inscribed "The County of Cornwall to the memory of Francis Lord de Dunstanville and Basset A.D. 1836." ; Cup and Saucer Rock The Cup and Saucer Rock next to the monument is a large flattish rock with several deep basins. The rock has been called "The Sacrificing Rock". ; Smugglers' Cave In a depression between the monument and the castle are the remains of the "Smugglers' Cave". It was blocked with rocks by the council in the 1980s to stop children entering. The tunnel is rumoured to extend from the top of the carn into Redruth town, but it is probably an abandoned mine working. It may have been confused with another tunnel from the castle to St Uny's church which was blocked for safety reasons around 1970 by the castle owners. ; Saint Euny's Well Saint Euny's Well is at the foot of Carn Brea below the castle near St Euny's Church. It has a plaque by Carn Brea Parish Trails reading "St Euny Well. Holy well of St Euny visited by the Celtic Missionary 500AD". Stories about its sacred use may be confused with St Euny's Well at Sancreed.
Events
At Easter Redruth Baptist Church erects a lit cross on the outcrop behind the Castle overlooking Redruth. For many years a Christian sunrise service has been held on Easter Sunday. The Midsummer Eve bonfire ceremony originated as a pagan ritual. Prayers are read inCornish and the bonfire is lit, signalling other fires to be lit at Sennen, Sancreed Beacon, Carn Galver to the Tamar. When only the embers remain, young people leap across them to drive away evil and bring luck. The Boxing Day meet of the starts at the top of Carn Brea. Due to the changes in fox hunting legislation foxes are no longer hunted.
