Re Lynne Mayers' questions:
The lack of recorded working or production does not necessaily mean that the mine was not worked
Wheal Triumph
Small mine worked principally for copper. Possibly started before 1780. Certainly working 1830-37 with a final working, along with adjoining setts about 1855.
Wheal Andrew
Copper 1845-48. Later, in the 1860's worked as part of Clifford Amalgamated - this group closed in 1870
St Austell Hills - more generally known as the Bunny Mine
Tin - 1834-38 with several other attempts - the last 1902-7
Tredarva
I can find a Trebarvah in Perranuthnoe parish, which could be the same mine. Worked in the 1840's probably both tin and copper. Later for copper 1852-61. Also 1873-4 mainly for iron.
Regards
Tony Brooks
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