Try getting in touch with Killhope Leadmining Centre. Their recently retired manager has written a book on the subject of Weardale and leadmining. I'll try and find the title. The Centre itself has a wide selection of books on the subject. It's also a great place to visit with lots of knowledgeable staff and hands on experiences of the process of leadmining. The history of leadmining and the social life of the miners is very well shown, as well as chronicled.