441 
MINES OF BATTLE MOUNTAIN, EAST GROUP. 
No. 2 vein. (See PI. XXVIII, p. 434.) The relation of the lodes of the southern zone 
in the Portland mine to those of Stratton’s Independence mine is discussed in the 
description of the latter mine on page 452. 
The northern ore zone of the Portland mine comprises a large number of approxi¬ 
mately parallel, nearly vertical fissure zones, which are often so closely spaced and 
so connected by branching fissures as to render their identification extremely difficult 
unless continuity is demonstrated by continuous drifts or stopes. Names were 
originally given to the more prominent fissure zones as they were encountered on 
various levels, but it was found upon further development that these lodes are often 
accompanied by adjacent nearly parallel lodes, which, though they may be of no 
importance on one level, may contain valuable ore bodies on another. Such addi¬ 
tional lodes were distinguished by prefixing numbers to the name of the original. 
Thus, for example, there are the No. 3 Hidden Treasure, the No. 4 Lee, and the No. 9 
Captain veins. The general strike of the lodes of the northern ore zone, as may 
be seen from PI. XXVIII, is regular and seldom varies more than a few degrees 
from N. 35° W. The dip, as nearly as can be determined in lodes so close together 
and often distinct only for short distances, is on the whole about vertical. 
The most southwesterly lodes of this zone are the four Lee veins, numbered from 
southwest to northeast and lying just east of the old Anna Lee shaft. These are 
rather short lodes of not very regular strike. Nos. 1, 2, and 3 have the prevalent 
strike of N. 30° to 35° W. The No. 4 Lee, however, strikes N. 65° W. and dips about 
75° NE. This, the most easterly of the four Lee veins, has great vertical persistency 
and is recognized on all the levels from the adit down to the 1,000-foot level. It is 
more nearly vertical than most of the lodes of the northern ore zone. 
North of the Lee veins are the No. 1, No. 2, No. 3, and No. 4 Hidden Treasure 
veins. These constitute a zone of generally nearly parallel fissures, ranging on 
different levels from a single narrow fissure to a total width of about 100 feet on 
the 900-foot level, where four individual zones of Assuring are recognized. The 
general strike of the Hidden Treasure veins is about N. 30° W. They thus join 
the more westerly No. 4 Lee vein at their southern ends. Inspection of PI. XXVIII 
shows that the Hidden Treasure fissure zones align with the No. 2 vein of the 
southern ore zone, but so far as known there is no connection*of the lodes across 
the intervening barren ground. While the No. 2 vein dips, as we have seen, 
to the northeast, the Hidden Treasure veins are, on the whole, approximately 
vertical. The Hidden Treasure veins are of but little value above the 500-foot 
level. On that level the No. 1 Hidden Treasure, and on the 600-foot level the 
No. 2 Hidden Treasure also, attain economic importance, which they maintain 
down to the 800-foot level, where the No. 3 Hidden Treasure becomes the prominent 
lode of the system and so continues to the bottom of the mine. 
Immediately northeast of the Hidden Treasure veins is an extensive series 
of parallel fissure zones known as the Captain system. The general strike of these 
fissures is N. 35° W. and they are, on the whole, nearly vertical. They constitute a 
broad sheeted zone from 400 to 500 feet in width, which is not sharply distinguished 
from the Hidden Treasure veins. Both sets of lodes belong, in fact, to one great 
zone of parallel Assuring. Within the Captain system are distinguished nine 
principal lodes, numbered from southwest to northeast. But these lodes are not 
