Thanks for the directions guys.
The pictures are very interesting, as the Governor & Company are another name for the LLC and the date 1849 co-includes the date of the royalty map, which is around 1840,
The BF will be the Bentyfield Company, which was a split lease with the LLC.
The stones I am referring to, may probably, as has been suggested, mark the boundary between Priorsdale and Alston Moor. The LLC bought the former around 1820, paid for by the profits of the discovery of a large flat at Ashgill. Hence royalties on ore here would go to them and not the Hospital.