Thanks, Spitfire. I agree about the database. There are often two or more entries for what superficially appears to be the same mine. This might be a problem compounded by several factors.
1. Several people adding mines at various times, independently.
2. The same plot of ground being worked at different times by different mining companies often in conjunction with other mines nearby under a different name.
3. Mines with complex names being recorded severally in different ways. e.g. South Wheal Frances, Frances South, SOUTH FRANCES, and so on.
Even if someone sat down to rationalise it all, no doubt arguments would start up about which shaft belongd to which mine, and whether the wrong database entry had been removed etc etc.
I sometimes think we have it easy in the south east where on the whole, we don't have names for the many small sites, and can make them up for ourselves at no risk of contradiction.