I don’t know if they have written about the mines you mention ,but Ivor J.Brown and Fred Brook with Martin Allbutt have written about the Shropshire Lead Mines .
They are cavers and have researched those mines extensively ,particularly The Snailbeach one.
D,R, Adams wrote about the Llanymynech Ogof ( number

in 1970, new edition edited by A.J. Pearce in 1992,
No numbers for that one
A phone number only I am afraid but The National Association of Mining History Organisations might have info :- 01629583814.
Not sure if that includes Wales but they might help somehow .
Viktoria.