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GENERAL GEOLOGY
MINERAL EXPOSURE
The vein in Engine Vein. View
looking east along the vein (dipping to the NE) which
here comprises largely pink/white barite brecciated
and infilled by fine grained galena and some
chalcocite (both grey to black). Malachite
(green) is abundant on the margins of the vein
especially as impregnations along the marly layers.
The slickensides on the plane of the vein (which infills a NW-SE trending fault known as the Engine
Vein Fault) suggest predominantly dip slip movement.
The suggested paragenesis is barite then galena.
In this photograph, a clay bed (dark red and grey) is seen approaching the
vein on the left (north).
The effect of reducing solutions moving through
the vein has been to reduce iron in the clay and to change the colour to grey. (Source: Marcus J Tomkinson)
(Left) Piece of ore. This piece shows the type of material removed from the mine complete with malachite but also pyromorphite (top edge) and quartz pebbles.
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