BATTLE MOUNTAIN MINES, WEST GROUP, AND OUTLYING PROSPECTS. 485 
The main workings have a generally linear plan and extend longitudinally 
through the claim. Near the old Dead Pine incline, however, are two series of 
northwest-southeast drifts following short cross pay shoots. 
LODE SYSTEMS. 
The fissure zone known in the Gold Coin mine as the Coin vein has an average 
easterly dip at the Gold Coin and Dead Pine line of about 73°. At the Oliver shaft 
the average dip is about 82°. At a point 300 feet north of the Oliver shaft the 
lode is practically vertical, while north of that point the general dip becomes dis¬ 
tinctly westward at an average angle between 80° and 90°. North of the old Dead 
Pine incline the fissure zone passes into the breccia, but becomes very small and 
obscure after leaving the granite. 
In addition to this dominant zone of nearly north-south Assuring, there are in 
the northern part of the mine two zones of cross fissures. The more northerly of 
these zones has a general strike of N. 48° W. The more southerly zone, which 
intersects the main Dead Pine lode about 125 feet south of the other, has a general 
strike of N. 26° W. The two zones thus converge toward the Ajax ground. Both 
fissure zones dip to the southwest—the northern one at 70°, the southern one at 
angles ranging from 35° to 80°, the latter being the usual dip. The southern zone 
is known as the Montana vein and follows the curved and irregular course of the 
phonolite dike of the same name. 
As the granite-breccia contact, which has locally a nearly east-west trend, dips 
to the north, while the northern fissure zone dips to the southwest, the two converge 
upward. The fissure zone, as a consequence of this convergence, meets the con¬ 
tact in the vicinity of the old level 8. If it persists above that level it should pass 
into the breccia, into which, however, it has not been followed. 
There is no perceptible displacement of the lodes at the points where the main 
fissure zone and the cross fissures intersect. 
GEOLOGICAL FEATURES. 
All the ore of the Dead Pine mine occurs in granite or in dikes of phonolite 
cutting the granite. The contact between the granite and the breccia crosses the 
northern part of the workings in a nearly east-west direction and dips north at 70°. 
Its position is §hown by the old Dead Pine incline, which follows the contact. The 
latter is fairly sharp and usually accompanied by some pyritization of the neigh¬ 
boring breccia. A few crosscuts have been run into the breccia without, however, 
the discovery of anything of value. The long crosscut on the 625-foot level to the 
northeast corner of the claim passes through breccia into massive latite-phonolite. 
The granite of the Dead Pine is the same as that forming the principal country 
rock of the Gold Coin, Granite, and Strong mines and needs no further description. 
The two principal phonolite dikes are the Montana dike and the East-West 
dike. The former is probably a continuation of the Montana dike of the Gold Coin 
mine and passes northwestward into the Ajax ground, where it is known as the 
Apex dike. It appears to divide as it crosses the Dead Pine and Ajax line, sending 
off a northerly branch toward the McKay shaft near the northwest corner of the 
