HAILE GOLD MINE. 
85 
level as pillars and as low-grade boundaries will be increasingly expensive by continuation 
of the open cut. Fig. 9 shows the distribution of values in the Bumalo cut. 
The Beguelin ore body is in general character similar to the two already described. It 
is cut in two by the 130-foot dike without faulting. Ore extends along the strike of the 
schists about N. 60° E. for nearly 300 feet on each side of the dike. Near the northeast 
end of the ore body the 27-foot dike, which has split, crosses the ore. Just outside the ore 
body, in the hanging wall, a 3-foot dike of much decomposed diabase, called a "clay" dike, 
parallels the strike and dip of the ore. PL VI gives a view of this interfoliated dike as 
exposed at the southwest end of the pit. The average thickness of the Beguelin deposit is 
about 70 feet. In depth the ore reaches to about 170 feet, and there quickly drops off in 
value. Most of the richest ore was taken out to this depth by underground workings. 
Open cutting was then begun. The open cut east of the dike is 160 feet deep and has 
practically exhausted that end of the ore body. At the northeast end, perhaps 40 feet 
below the surface, were found the specimens showing free gold in the joints described on 
pages 63 and 64. About 50 feet northeast of this place and 35 feet deeper a small body of 
heavy pyrite, carrying some zinc, was struck, and 100 tons were shipped for the manufacture 
^ 
192-foot dik 
at surface 
Alt 
red volcani 
:tuff 
\^x 
Lean ore 
mi 
Pay ore 
>$l! 
Fig 
-Longitudinal projection (approximate) on plane of deposit of the Bumalo ore body, Haile 
mine. 
of sulphuric acid. On the southwest side of the dike the open cut had been carried to a depth 
of 120 feet at the time of visit, and had almost reached the southwestern limit to which 
underground mining had been carried. (See PI. VII.) Still farther southwest of this 
point for over a hundred feet values are encountered, but they are so low that it is doubtful 
if mining can be extended there. The demarcation of this material from the surrounding 
rock, however, is such as to place it as part of the ore body, and it has so been shown in 
fig. 10. 
Sihcified and pyritized tuff carrying gold values is known in several other places. Assays 
have been obtained at several points northwest of the Beguelin pit, but up to the present 
time no further prospecting has been done in that locality. On a small elevation known 
as Chase Hill, several hundred feet northeast of the Beguelin cut, some shallow open pits 
have been dug on siliceous rock, with numerous quartz-rich streaks. Pyrite, once plentiful, 
has been mostly oxidized and carried away, leaving the rock crumbling and stained. The 
strike of these pits is in direct line with that of the Beguelin, and it seems highly probable 
that the two ore bodies are connected by a band of lower-grade material somewhere under- 
ground if not at the surface. The Chase Hill deposits, although explored underground as 
