For the last couple of years, I've become increasingly interested in the Jet mines of Cleveland and North Yorkshire.
Most texts will inform you that jet only comes from the cliffs around Whitby, but in reality many of the mines were inland.
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The occasional paragraph on the industry appears in literature, but tends to concentrate on the workshops in Whitby rather than the mining itself, which is virtually undocumented outside of papers by Parkin and Owen mentioned here :-
http://nmrs.org.uk/mines/coal/cleveland/jet.html Very little paper trail, no company records, no production figures, no abandonment plans etc etc.
I think its regarded by most as a cottage industry, undertaken part-time by small groups of ironstone miners in hard times. Many of the workings reflect this being irregular and only a few yards in length.
However as with most things, the more you look the more you find. In one area we've located something rather different, one large set of workings that we've so far surveyed to well over 2km and I suspect will easily be beyond 10km by the time we've finished (having pushed on and not found a conclusion in any direction yet)
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I suspect I may have found my "book" here, but there's probably years of work in surveys to be done at least, so don't expect to see it on the Amazon bestsellers list any time soon.
If anyone has ever come across any obscure references or explored and documented any workings in the past I would love to hear from them
(i'm thinking Tamarmole and AR could be candidates?)