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Dirtlow Rake (GR) is a major WSW-ENE trending strike slip fault lying just to the south of Castleton. Castleton, Figure 1.  Thewidth of the exposed  fault is greater than 10m exposed in a series of old surface workings where excavations up to 10 metres wide  and it has several 10's of metres long have  been extensively worked over a greater than 10km made for the commercial extraction of galena and spahalerite, Figure 3. These old pits can be traced along the  length of the fault  for Pb (galena) a distance of more than 10km. Where exposed individual slip planes show well developed sub-horizontal slickensides. Within the fault There is extensive development of a complex vein fill dominated by calcite with variable amounts of barute, fluorite, galena  and Zn (sphalerite). Hydrothermal spahalerite. The  calcite occurs as large syntaxial and large,  elongate, sparry syntaxial  crystals. The growth form is  often exhibits sparry with  dog-tooth terminations indicative of growth into a void. In thin-section  for the top of the platformevidence for high pore fluid pressures during the period of faulting with the development of mode I fractures and in places a pervasive mesoscale fracture network. Fracture dimensions range from sub-mm to fault widths of several metres. Fracture and fault vein fill at all the locations is dominated by white, sparry calcite often showing a syntaxial growth pattern with varying degrees of complexity as a result of repeated episodes of movement, brecciation and renewed hydrothermal mineral growth.