210 
ECONOMIC GEOLOGY OF SILVERTON QUADRANGLE, [bull.183. 
level, if carried far enough, there should be found a place where the 
two lodes cross in a horizontal plane. The confluent portions, how- 
ever, must lie much farther northwest, theoretically about 050 feet 
for eacli additional 100 feet in depth. The workings as yet are not 
sufficiently extensive to determine whether this feature of their inter- 
section actually holds true on all levels. The intersection of the lodes 
led to a curious error when the present main adit tunnel (600 level) 
was run. In all the old adits above the 300 level the relatively barren 
Iron A^ein had been cut before reaching the Tomboy lode, the two 
being 220 feet apart on the 200 level. In the 600 adit, however, the 
Tomboy was first cut, and as it 
Cross-cut 
Cross-cut 
ZOO Level 
300 Lev el 1 
600 Level 
was not productive at this point, 
it was supposed by those then 
in charge of the exploitation to 
be the Iron vein reversed in dip. 
Consequently the adit tunnel 
was continued 185 feet farther 
to the Iron vein, which was 
then worked on the supposition 
that it was the Tomboy. It is 
generally barren, but on this 
level shows an ore body about 
15 feet wide and over 100 feet in 
length. It is, however, a galena 
ore, carrying about 40 ounces of 
silver, and totally different from 
the Tomboy ore. 
The exact nature of the inter- 
section of the two lodes is not 
determinable from present ex- 
posures. In raising from the 
600 level to the 200 level on the 
Iron vein for the purpose of 
connecting with the upper drifts 
on the Tomboy lode, it was 
Fig. 15. — Cross section of the Tomboy and Iron 
lodes through No. 12 raise on the Iron lode and a 
neighboring raise (projected) on the Tomboy 
lode. Platted from notes of surveys by Mr. 
John Herron. 
found that these raises came 
out as much as 50 feet within the hanging wall of the latter lode and 
connection had to be made by crosscutting (figs. 14 and 15). It was 
noted that each of these raises passed at some point through a great 
mass of somewhat shattered quartz, usually about 12 feet wide, and 
with no regular walls. This was probably the intersection of the lodes, 
as indicated by subsequent surveys. One of the best pay shoots in the 
mine occurred at a point which was afterwards discovered to be on or 
near this line of the intersection. On the '300 level, northwest drift, 
the gradual convergence of the Tomboy and Iron lodes has been 
traced by crosscutting at intervals from the former to the latter. At 
