No. 2 Lode, South Crofty Mine

South Crofty Mine, Carn Brea. South Crofty Mine: No. 2 Lode, Robinson's Section. A branch on north side of No. 2 Lode, 310 fm. Level, Robinson's Section. The branch in granite country rock consisting mainly of chlorite-tourmaline peach is seen, nearly vertical, in the end of the level. The horizontal quartz veins, here inclined, are seen to be faulted by the branch lode. 'Lode' is a term probably derived from the verb 'lead' and applied by early miners to formations which might guide or lead to ore. 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 channels for the mineralizing 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 causing block movement and possibly gravity-slumping.

Photo P208027. Reproduced with the permission of the British Geological Survey ©NERC. All rights Reserved.

This photograph is by carnkie and was uploaded December 9^th 2009. © carnkie please do not copy or distribute without prior express permission.

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