| P number: | P208029 |
|---|---|
| Old photograph number: | A08107 |
| Caption: | South Crofty Mine, Carn Brea, Cornwall. |
| Description: | The mill at South Crofty Mine, Carn Brea. The cam-shaft gallery of the 60-head Californian Stamp battery. A stamp is a device for crushing rock, calfornian stamps were made of steel and mounted in sets of five. The wall rock in South Crofty is pink granite composed of quartz, orthoclase, plagioclase and muscovite. The plagioclase is often completely kaolinized and sericitised. The veins are mostly quartz-chlorite and fluorspar-quartz-chlorite rocks and haematitic material is abundant. The tin ore is cassiterite. The Carn Brea area embraces the northern slopes of the Carn Brea granite and the thermally metamorphosed killas and greenstone that overlie its northern flank. The numerous lodes in the area trend east-north-east and are related to extensive shattering of the rocks, the latter contemporaneous with the injection of the ores but probably earlier. |
| Date taken: | Wed Aug 01 00:00:00 BST 1945 |
| Photographer: | Rhodes, J. |
| Copyright statement: | Crown |
| X longitude/easting: | 168500 |
| Y latitude/northing: | 41500 |
| Coordinate reference system, ESPG code: | 27700 (OSGB 1936 / British National Grid) |
| Orientation: | Portrait |
| Size: | 242.11 KB; 643 x 1001 pixels; 54 x 85 mm (print at 300 DPI); 170 x 265 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images, Geoscience subjects/ Economic geology/ Metalliferous mining, tin |
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