the drift (/) on the 200-foot level, was carried in a distance of 250 feet. The dike when encountered was 35 feet thick and no longer decomposed on the wall, as was the case in the upper level, but hard and solid. By upraises 4 more stopes were opened. The ore was of a better grade in proximity to the dike on both sides.
During 1896 an open-cut was made opposite the old Haile pit, in order to take out the pillars and the ore in the hanging, above the 200foot level.
The old workings (S, fig. 23), which were continued from the Bumalo pit (B, fig. 23), to a depth of 200 feet, and were for a long time inaccessible, have been opened up by a diagonal drift from the 270-foot level (h, fig. 23). Some time ago a northeast tunnel was driven from the Bumalo pit, at a depth of 50 feet and for a distance of 150 feet, to a diabase dike 150 feet in thickness, and later continued through this. Drifts on the further side showed up only barren ground, but good ore was found from the mouth of the tunnel to the dike, being richest near the dike. This ore-body was encountered in the 270-fQot level with the drift above mentioned, and the ores are found to be more heavily sulphuretted than anywhere in the Cross mine.
So far as explorations have gone, 3 different lenses have been encountered: 1. The Bumalo,furthest northeast; 2. The Haile or middle lens; 3. A small lens 80 to 90 feet west of the Haile (outcrop under the new boiler-house, 17, fig. 21).
During the summer of 1896 an electric diamond-drill hole was started in back of the old store building (just to the right of 5, fig. 21). At a depth of 58 feet the cores showed ore, assaying as high as $6, and it appears as though this were in a new hanging wall lens. In order to solve this question a cross-cut is being driven on the 270-foot level along the 25-foot dike in a northwesterly direction.
Red Hill (A, fig. 21) consists of a number of open pits on the northwest side of the 150-foot dike, where ore was formerly mined to a depth of 60 feet. It is supposed to be in a line with the Haile lens.
The thickness of these lenses varies, reaching 100 feet in places, while at others, near the end of the lenses, it is only from 25 to 30 feet.
METHOD OF WORKING; HAILE MINE.
The method of working these deposits is the pillar system (Pfeilerbau). illustrated in fig. 24.
The levels (8x7 feet) are run 70 to 100 feet apart, and nearer the hanging than the foot-wall. At intervals of about 50 feet upraises are made, with a cross-section of 8x7 feet. These are carried forward at an inclination as near as possible to 45°. If necessary, the upper portion through the chain pillar left under each level is carried up vertically.
