MIXES BETWEEN ALTMAN AND GOLDFIELD. 
397 
in most places considerably decomposed. The Isabella dike is seen to cut directly 
through the Pinto dike, and no evidence of faulting could be found. The latter 
dike has been opened in ail levels. The third basalt ic dike, known as the Harrington 
vein, is best seen in the southeast crosscut on level 5, about 150 feet from the shaft. 
It strikes X. 10° W. and dips steeply to the cast. Basalt does not occur throughout 
the fissure, but alternately pinches out and comes in, everywhere much decomposed. 
The Harrington vein intersects the Pharmacist on several levels up to the 100-foot 
level. 
VEIN SYSTEMS. 
The principal vein of the mine is the Pharmacist vein. Its course is N. 60° E. 
and it dips on an average 62° NE. The shaft was sunk on the apex ot this vein, 
and at the various levels crosscuts have been run to the north to reach it. So much 
stoping has been done that the vein can be examined in only a few places. On 
level 2 to the east of the crosscut it appears as a narrow crack, sometimes opening 
into small lenticular vugs holding quartz. The country rock is hard latite-phonolite, 
very little oxidized except close to the fissure. In places the Assuring is not con¬ 
fined to a single point, but spreads out into a zone 2 to 3 feet wide. 
The Pinto basalt dike, which is itself of economic importance, is cut by this 
vein, and the Harrington vein or dike, which is elsewhere valueless, influences the 
richness of the ore at its intersection with the Pharmacist vein. The crosscut to 
the southeast on the 550-foot level reaches the Wilson vein 650 feet from the shaft. 
This vein consists of a series of parallel seams in silicified breccia, not much oxidized. 
It carries no ore on this level. Its course is about N. 35° E., and it dips very sharply 
to the northwest. Near the crosscut it is intersected by a sheeted zone which runs 
north-northwest and gives low-grade assays. The drift on the Wilson vein should 
cut the Pinto basalt dike about 750 feet from the shaft, but the dike apparently 
breaks up, for, though fragments of basalt are found about where the dike ought 
to be, no regular^ defined body of that rock is encountered. 
The Pharmacist vein carries values principally as rusty gold, but with here 
and there patches of tellurides in the crevices which make up the vein. The screened 
and sorted ore averaged about $40 per ton where mined, but in places it was of too 
low grade to be worked. The vein is stoped practically continuously from 250 feet 
down to 550 feet from the surface across the property. At the intersection of the 
Harrington and Pharmacist veins an irregular ore shoot 5 to 20 feet in diameter, 
was stoped from above the 100-foot level to the 350-foot level, at which point the 
shoot passed into Empire State ground. The average value of the ore from this 
shoot was 4 ounces. Where the Pharmacist vein crosses the Pinto dike occurred 
one of the rich ore shoots of the camp. The values were largely in the basalt and 
consisted of both tellurides and derived rusty gold, while the Pharmacist vein and 
the mineralized country rock near the dike were completely oxidized. The ore 
was shipped as mined, and gave returns of 7 to 8 ounces. This rich ore occurred 
in a body with a roughly circular horizontal cross section 6 to 15 feet in diameter, 
and reached from the surface to where it left the Pinto ground, 90 feet below the 
550-foot level. At this point the shoot was impoverished. 
On the Pinto dike ore occurred on level 2, 100 feet south of the Pharmacist 
vein. A pay streak 1 foot wide on the west side of the dike in the soft decomposed 
13001— No. 54—06-27 
