Collapsed and capped shaft from Wheal Dream

On the side of the old Helston railway line, there are three shafts, thought to be from a mine called Wheal Dream. Wheal Dream was quite a big mine with it's engine house near Wendron and different shafts all around it.
This shaft could be one of them which looks like it collapsed when the railway was dug. There is also some stones inside it which could be covering up a deeper shaft.

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