There is a fairly detailed archaeological report I think from the 1980's & a book by B Shorten on the mines of Plympton, copies in Plymouth Local Studies library which are probably the best published sources. I have very extensive notes from sources such as the Strode Papers at PDWRO, Mining Journal & Newspapers, best to give me a ring if you want any further info (won't be able to get online very often over the next few months).
Alasdair Neill.
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