Roanburn Vein trends about 15° west of north, shades to the east at 60°, and has been traced for a distance of over half a mile. Along the greater part of its course it is associated with a felsite dyke, which is cut through and brecciated by some of the movements to which the vein has been subjected. The vein has been worked to a fair extent, and an adit-level was formerly driven along its course nearly as far as Deadburn. At one point (between Hope’s and Patterson’s Shafts) it contained a good deal of barytes with quartz and some galena up to 2 in. in thickness. Just south of here, and near Moffat’s Shaft, the workings branch off into another vein which trends 30° west of north, consists mainly of barytes, and is clearly seen to be cut by the Roanburn Vein, though the amount of displacement cannot be made out. In all probability this vein is the Katystaklin Vein which further to the south has yielded a small amount of galena between the Katystaklin and Poutshiel Levels. Horner’s Vein is the continuation of Jeffrey’s Vein, and at this locality has been worked on a fair scale in both directions. It hades slightly to the south-west, and consists mainly of brecciated country-rock with barytes and some dolomite.