| P number: | P209716 |
|---|---|
| Old photograph number: | A09805 |
| Caption: | Blackpool Pit, a china clay pit, Burngullow Common, St. Austell. Looking south, Devon. |
| Description: | A group of circular settling tanks, with drying sheds containing large oil-fired rotary driers in the background. The process at Blackpool pit was to transfer the newly mined china clay slurry by means of gravity pumps where it goes through classifiers to remove the coarse sand, the latter being taken by conveyor to tips. China clay working consists of using high pressure water jets to strike the working face with such force that the clay is removed as a slurry. Quartz grains and then mica are removed from the slurry by sedimentation in channels and settling tanks. The sandy waste is used in bricks and concrete products and the finer mica is marketed as low grade china clay and used in oil refining as an absorbent and detergent. Blackpool pit, near Trewoon, 3 kilometres from St. Austell was recorded in 1969 as being 85 metres deep and covered 41 hectares at the surface. It produced between 7600 and 810 tonnes of refined clay every week. |
| Date taken: | Mon Jan 01 00:00:00 GMT 1962 |
| Photographer: | Thompson, J.D. |
| Copyright statement: | Crown |
| X longitude/easting: | 198500 |
| Y latitude/northing: | 53500 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Landscape |
| Size: | 291.42 KB; 1001 x 803 pixels; 85 x 68 mm (print at 300 DPI); 265 x 212 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images, Geoscience subjects/ Economic geology/ China clay |
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