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Uploaded on:
09/03/2009 06:35:30
Type:
Digital Asset
File Size:
355.77 KB
Dimensions:
714 x 1000 pixels
1206 views 4 downloads
P number: P208006
Old photograph number: A08084
Caption: Geevor Mine, Pendeen, Cornwall.
Description: The Coronation Lode, Geevor Mine, Pendeen. The Coronation Lode is in the east end of the 10th Level. The photograph shows the main quartz leader (white) and other quartz-filled fissures with chlorite (dark) alongside and altered, tin-bearing granite (above hammer). The term 'lode' is near synonymous with 'vein'. It is within the lode that the ore minerals and the gangue (waste) minerals were formed. In south-west England faulting has played a major part in governing the pattern of lode development and many hypothermal (high temperature and mesothermal (intermediate temperature) veins can be directly related to normal faults. A general fracture pattern which eventually produced the fractures for the mineralising fluids probably developed during the initial period of folding and granite intrusion. Later relaxation of the regional pressures and shrinkage caused by the cooling granite then reactivated the fractures. Many of the tine lodes coincide with one set of major joints in the granite.
Date taken: 01/08/1945
Photographer: Rhodes, J.
Copyright statement: Crown
X longitude/easting: 137500
Y latitude/northing: 34500
Coordinate reference system, ESPG code: 27700 (OSGB 1936 / British National Grid)
Orientation: Portrait
Size: 355.77 KB; 714 x 1000 pixels; 60 x 85 mm (print at 300 DPI); 189 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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