There is loads of info. on mines in all the PDMHS publications, including some extremely detailed descriptions of certain systems in their Bulletins.
There is also detailed information in the 3 DCA Conservation Audits on Masson Hill, Jugholes and Cumberland/Wapping - all 3 publications available from DCA, check out the website.
There is also "The Little Red Book", which is still in print I think. And plenty of other specialist books and reports on specific systems.
However, what there isn't is one single, comprehensive book which covers ALL the mines, both accessible and inaccessible. (Hardly surprising when there are over 8,000 of them.) That's why CoPD has to concentrate on those mines which are generally easily accessible and of interest to sporting cavers as well as systems which are combined mine/natural, as so many are in the Peak District.
It would be great if there was a comprehensive book about all the mines but it would take many years to compile and would probably have to be so large that it would cost a bomb to print and be so expensive that almost no-one would be willing to buy a copy. Sadly, commercial considerations play a large part in what you can publish - as witness all our problems trying to find a publisher for CoPD. No commercial publisher would touch it so we had to do it all ourselves, and that means paying out a lot of money up front and hoping to recoup it from sales.
Jenny P.