Thanks to the members on NGRM On-Line for their comments and suggestions.
I have been experimenting with the positioning and gradient as well as a baffle at the bottom end. The chute is already as low as it will go, it allows wagons but not locos to pass beneath it so a stop board will be needed!
The other thing holding up work on the mine at the moment was referred to yesterday, I still need to get some more wriggly tin before cladding the building.
In the meantime I’ve been concentrating on the rock formations and the bridge but I have just run out of filler as well!