I've uploaded the 1856 map of the R & C. It's not the highest quality but quite important. There is a bit of a dispute going on at the moment. Maurice Dart, who has written a number of books on the mineral railways, states in one of them that between 1847-1851 the railway was extended to South Francis and possibly even further west. It was taken up at an unknown date.
I've searched through all the R & C archives at the CRO and can find no record of it ever going beyond the Wheal Buller/Wheal Basset boundary, where the terminus is on the map so I don't know where he got his information from. I suppose the best way is to ask him. At least we now know where the Wheal Basset coal yards were. The Google Earth of the area is quite helpful. The path running north from the coal yard was the line of the railway as shown on the 1880 OS map although it turned east before reaching the road. the Basset stamps were at the western edge. You can see the remains of the Vanner House.
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The past is a foreign country: they do things differently there.