Kit Hill Country Park, was given to the people of Cornwall in 1985 to mark the birth of Prince William, by his father, the Duke of Cornwall. It is managed by Cornwall Council, and consists of some 400 acres, making it the most dominant landscape feature in East Cornwall. Kit Hill is the highest point in the Tamar ValleyArea of Outstanding Natural Beauty. The hill was formed in the same way as nearby Bodmin Moor by the intrusion of magma into overlying sedimentary rocks. This caused the formation of many mineral deposits that were mined extensively in the 18th and early 19th centuries. As the highest point of Hingston Down, Kit Hill is probably the best viewpoint in the southeast of Cornwall, with views of the Tamar valley, Dartmoor and Bodmin Moor. Kit Hill Country Park has a high wildlife population including deer and badgers, rabbits, rare moths and butterflies. On the summit of Kit Hill is an artificial fort and a folly built by Sir John Call of Whiteford, Stoke Climsland, built in the style of a low-walled Saxon castle.
History
The Anglo-Saxon Chronicle reports that in 835 Egbertking ofthe West Saxons defeated an army of Vikings and Cornish at Hengestdun = "Stallion Hill", which is usually interpreted as being at Hingston Down. Other notable artifacts on Kit Hill include Neolithic and Bronze Age barrows. The area around these is maintained by a ranger and volunteers, who also generally keep the vegetation on the hill under control.
In 1877 a company called Kit Hill Tunnel Ltd began work on both the south and north sides of the hill to create a tunnel which would be long. The southern portal was at Silver Hill, and that at the north was near a small mine called Excelsior. However, due to the toughness of the underlying bedrock, progress was costly and slow, and ceased about a year later. In 1881 a new company named Kit Hill Great Consols took over the setts of Kit Hill United and Excelsior mine. They deepened the North Engine Shaft to 112 fathoms and lengthened the tunnel running south to meet it. However, this too was proving too costly, and wound up in 1885, before it was half-way complete. Several later attempts were made to extend the Excelsior Tunnel, but by 1938, it was still only long. However, in 1959 the Atomic Energy Authority took over operations, and used the tunnel for underground explosions. The activities were part of Operation Orpheus, and the Kit Hill events were the first part:
Phase A: Small charges fired in a diameter cavity in granite and shale at depths of 100 to in the Excelsior Tunnel at Kit Hill.
Phase C: The tests at Greenside Mine in Cumbria, where a decoupled test and a coupled test would be carried out in andesite rock at a depth below surface of and the results compared. The charge sizes were chosen so that if the decoupling worked as predicted, the seismic signals would be similar in intensity.