Parts of the amphibole skarn and the iron ore are rish in Fluorite; this type of skarn is as much as a few feet thick and ranges from 20 to 60 percent fluorite.
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The mine has yielded several tens of thousands of tons of magnetite ore; associated with the magnetite ore are supergene hematite, vonsenite, Fluorite in dar mica skarn, pyroxeneamphibole skarn and quartz-bearing amphibole skarn.
He has written several popular introductions to Peak District geology, a definitive study of the local fluorite Blue John, as well as numerous cave guides.