£80k! I think not.
Odd looking engine house. I wonder if it was an under-beam engine, like Wheal Andrew, or whether it has been very seriously modified.
It seems unlikely to me that it's a multi-purpose one like Daubuz of Wheal Francis where the engine did lots of things include pumping and winding from a shaft in front.
What's the reckoning? £160k
BTW, I gather the river is quite good for Gold panning.