Are you talking the plot of land with the holes in, or the engine house?
If the latter, I imagine it will have a comedy price which you would think would better fit a fully restored Towanroath Pump house.
They do come up from time to time. Broadgate pump house (New Consols) came up with an absolutely ridiculous price. Then there was Trencrom multipurpose engine house with a ridiculous 20 year clawback clause.
For the record, I gather Belowda Mine aka Beacon Mine was last operated in something like the 30s. The second Bradford Barton engine houses book has a good photo of it looking pretty complete.
Do you have a link?
Edit:-
http://www.vebra.com/property/2966/20721247 It appears to be the engine house/dressing plant. The holes are further up on the hill.
Edit 2:-
Interestingly enough, the plan:-
http://www.vebra.com/details/property/floorplan/20721247 Shows 2 shafts, which indicates the rotary engine probably ran a set of flat rods and perhaps also hoisted (but probably also ran some heads of stamps) from the shaft in front, a la Daubuz Engine at S Wheal Frances.
Those shafts weren't on my map. They look to be there on google earth. I don't think the workings had an drainage adit (even though there is a level up the hill) and I imagine the lowest of the 2 shafts was a farmers bin. I'll go and have a look.
Interesting, I almost started a thread on this mine, a while ago. There are also some interesting remains further along the hill towards castle an dinas. I wonder if these were the mill remains of Belowda Mine.
....and whilst I'm at it. The engine house and the 2 shafts are not on the 6" 1907 map which suggests they are a part of a later working. I'm going to St Columb tomorrow, I'll have a sneaky peaky.