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The intrusion of granite into the surrounding sedimentary rocks [5] gave rise to extensive metamorphism and mineralisation. [6] As a result, Cornwall was one of the most important mining areas in Europe until the early 20th century. It is thought that tin ore (cassiterite) was mined in Cornwall as early as the Bronze Age. [7]
Skarn type mineralisation related to these granites is a very important type of tin, tungsten, and molybdenum deposit. Skarn deposits form by reaction of mineralised fluids from the granite reacting with wall rocks such as limestone. Skarn mineralisation is also important in lead, zinc, copper, gold, and occasionally uranium mineralisation.
Though it has declined significantly agriculture is still of economic importance. Ginsters in Callington is a mass manufacturer of Cornish pasties. Dairy Crest has a large cheese factory at Davidstow and A. E. Rodda of Scorrier is a supplier of clotted cream. Furniss of Truro manufactures biscuits.
Despite their economic importance however, sedex deposits are relatively rare. A worldwide compilation of sedex deposits indicates that about 70 are known, of which 24 have been or are being mined. The majority is uneconomic to mine because of relatively low grade or unusually fine grain size, making mill recovery rather low.
Granite, slate and aggregate are still quarried and china-clay extraction continues on a large scale. There are ample supplies of granite worth the cost of shipping out of the county and much Cornish granite has been used in distant places. It is one of the most appropriate materials for memorials and examples are found in most parts of Cornwall.
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The Dartmoor granite pluton is the largest but others include those giving rise to Bodmin Moor, West Penwith and the Scilly Isles. Within the Dartmoor outcrop as a whole there are numerous isolated pockets of finer granite, particularly in the area north of Burrator Reservoir and in the valley of the Dart below Dartmeet.
The founder and CEO of investment firm Citadel on Tuesday called aggressive trade talk from the new administration a "huge mistake," producing chaos that in Griffin's view poses an "impediment" to ...