Yes, manganese was mined in the Hartshill/Oldbury area of north Warwickshire
(between Nuneaton and Atherstone) in the period 1820 to 60 and some very
overgrown tips can still be found - or at least could be 20 years ago - in
Hartshill Country Park. A Google search on hartshill + manganese produces
quite a few hits and I have a vague memory of some manganese mining archive
in the Warwickshire County Record Office in Warwick.
John
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