MINES OF BULL HILL. 
379 
ORE. 
The general character of the Modoc ore is like that from the main vein of the 
Last Dollar. The narrow seams in the vein contain quartz, with a little dolomite, 
and are coated by tellurides. There is very little fluorite. The oxidation extends 
in places down to the bottom level, while some fresh tellurides were found as far 
up as level 2. In many places the veins contain a contact seam filled with a hard 
white substance which proves to be impure alunite, a potassium-aluminum sulphate, 
probably formed by oxidizing influences. There is little silver on the upper levels, 
but more on the lower; some tetrahedrite was found on level 15. In the southern 
shoot the ore contains as much as 28 ounces of silver per ton. A little zinc blende 
occurred on one cross vein, but the strong development of sulphides on these veins, 
so prominent in the Last Dollar, seems absent here. More pyrite occurred in the 
lower levels, but was here, too, associated with calaverite. The ore is of the usual 
high grade. At present a wide body of ore is mined at the south end of the claim, 
being taken out 18 feet wide in places. The screenings only are kept, but these run 
upward of 4 and as high as 8 ounces per ton. The ore in the phonolite is as good 
as that in the breccia. 
ORE SHOOTS. 
The ore in the Modoc vein, as in the Last Dollar, seems to depend on its inter¬ 
section with cross veins or with joint systems having a northeast or southeast 
strike. The ore extends only a few feet on these from the main vein. Some ore 
has been mined from vein No. 2, but the most important part of the production has 
been derived from the main vein near the shaft. The stopes on the main vein 
extend to within 100 feet of the surface and to all of the lower levels except 14 
and 15. On level 9 they are 150 feet long. A parallel shoot lies on the No. 2 vein, 
a short distance east of the main vein. To the south, on level 9 there are three 
smaller shoots, all occurring at intersections with cross joints; one is now being 
mined in phonolite from a winze 150 feet below level 9 and 850 feet south of the 
main shaft. 
RUBIE MINE. 
The Rubie property, adjoining the Last Dollar on the north, has been exploited 
under lease by the Princess Alice Gold Mining Company. Work was discontinued 
a few years ago. 
The Rubie shaft is located 1,450 feet north-northwest of the Last Dollar shaft. 
It is about 800 feet deep, with drifts extending 300 feet north and 500 feet south. 
Three hundred and fifty feet to the south a winze has been sunk to an approximate 
depth of 400 feet. The main drifts follow a vein with occasional bunches of ore 
which lie in the direct northward continuation of the Last Dollar vein. The vein 
is vertical or dips very steeply to the east. At the winze mentioned a northeasterly 
trending cross vein intersects the main vein, and here a narrow pipe or chimney of 
good telluride ore was found, averaging in value about 860 per ton. This narrow 
shoot extended through a vertical distance of 400 feet. It had a rounded cross 
section, with a diameter of from 7 to 30 feet, was contained in breccia, and seemed 
to represent an old water channel. The gangue consisted of quartz, chalcedony, 
and fluorite. 
