Carn Brea branch & quarry
You could well be right. However the end of the branch would undoubtedly had a run around loop and sidings. Leave the verdict to the jury? Of a loco on the inside line running round or indeed a steam plum from some kind of hoist machinery which you can see in front-below the parked wagons on ‘this’ edge of the embankment?
Perhaps-maybe not? JR
And further thoughts - half an hour later. . Bit of dog plus bone perhaps?
I did some drawing in red & blue on a snip of your scan. There appears something behind the tracks (outlined in red) which on re-reflection actually looks like some kind of kiln with a dark access way on the extreme left of the working face. If you look carefully at the base of the emission you can see it curves out of the top of some kind of flue which is visible under it!
The blue structures appear to be a water tank on a plinth and some kind of hoist in front of the rail lines. JR
The original picture is taken from a point about 640 yards east of the quarry, very near where I live. If you look at the area on Google Earth you will see the quarry on the east face of the Carn. There was obviously more working at the quarry long after the railway had gone. A 'lower level' access cut through what would have been the rail formation. Looking at the 'lie of the land' the slope of the Carn shows no sign of sidings. Maybe trucks were simply pushed up from the siding and head shunt alongside the main line. There is a track diagram of the main line end on our section on the Carn Brea Quarry branch in 'Cornwall Galleries'.