How far have you traced the leat from luxulyan valley?
I havn't traced it at all yet, I was just wondering if anyone knew of the leats course, I have not had chance to visit the viaduct or the Ponts Mill area yet, Fowey Consols was a big set up in it's day but very liitle remains today apart from a couple of engine houses and a few shafts so far as I am aware. I had heard a rumour that the leat passed under the road (Penpillick Hill) and under one of the houses on the mine side of that road.
I suppose I could get a rough idea by following the map contours using Treffrys viaduct as a datum level maybe.
The walls of the bridge that spanned Green Lane to cary the incline plane can still be made out.
On De La Beche's plan (1837) it shows the mine leat flowing round the topside of Austens Engine House.
The above plan is in the photo section of Fowey Consols on this forum as is a section from the tithe map c. 1840.
Lozz.