BGS Image ID: P200171 |
BGS Image ID: P200203 |
Hendra Downs China-clay Works, St. Dennis. Looking N. Team and waggon with load of clay.
BGS Image ID: P2009710
Old photograph number: A09799 1962
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China clay workings, Great Pit, Lee Moor, south Dartmoor. General view of china clay-pit showing systems for disposal of waste sand; (1) right, old inclined railway to large 'burrow', and (2) left, new covered conveyor belt to small burrow (sited on ground having low clay yield). China clay is formed by the kaolinization of granite, a process of late hydrothermal alteration where acid solutions moved along the joints in the granite and caused the plagioclase feldspars to be converted to kaolinite. The name kaolin comes from the mountain Kauling in China where the material was discovered. Large scale exploitation began in the 18th century. Recently the industry has become intensively mechanized.
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