jim, theoretically this photograph could be of any of the Carrock Fell Mine veins.
i.e. Emmerson, Harding, Smith or Waterfall, since they all contain a mixture of minerals, which is a mixture of Arsenopyrite, Apatite, Calcite, Gilbertite Mica, Pyrite,Quartz, Scheelite, and Wolframite.
I must add in my personal opinion it is probably, Harding.
Photograph:
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