Only plan I have seen is MRO R307 (at Cornwall Records Office). This just shows surface features & lodes.
Dines' description suggests he may have seen a plan, there may therefore be a copy in British Geological Survey records. Some of the companies doing mine searches in Cornwall such as Cornwall Consultants may have microfilm copies of these.
I think there is a description of workings accessible in the 1960's in Plymouth Caving Group publications.
The Duchy of Cornwall may hold a plan, although not mentioned in the list of their plans I have which may not be complete.
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