Further to my earlier posting, I would have thought that in such cases, it is worth contacting Jim Rieuwerts. He happened to phone me up last night for a long chat about mining and I mentioned this topic to him. He has seen an old section of the Little Pasture workings.
No one has ever had such a wide ranging knowledge of Derbyshire lead mining as Jim and he is a very friendly and helpful gentleman - but he does not do the Internet.