| P number: | P209710 |
|---|---|
| Old photograph number: | A09799 |
| Caption: | Great Pit, Lee Moor, south Dartmoor, Devon. |
| Description: | 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. |
| Date taken: | Mon Jan 01 00:00:00 GMT 1962 |
| Photographer: | Thompson, J.D. |
| Copyright statement: | Crown |
| X longitude/easting: | 256800 |
| Y latitude/northing: | 61000 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 336.94 KB; 1000 x 816 pixels; 85 x 69 mm (print at 300 DPI); 265 x 216 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Industrial geology, Geoscience subjects/ Economic geology/ China clay |
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