BATTLE MOUNTAIN MINES, WEST GROUP, AND OUTLYING PROSPECTS. 473 
West of the shaft, along the western edge of the claim, a mass of latite-phonolite 
is exposed in the crosscut and drift connecting with the Dead Pine mine. This is 
undoubtedly the same intrusion as that in the northeastern part of the Dead Pine, 
noted on page 485. Its form is unknown, as its contact with the breccia is exposed 
at only one point, on level 6, and is there greatly obscured by alteration and pyritic 
mineralization. 
The granite is cut by several very irregular dikes and sills of phonolite—often 
mere bunches which can not be followed for any great distance, though if completely 
explored the}” would probably be found to connect with small dikes below. At 
the south end of level 10, about 900 feet south of the shaft, is a generally east-west 
dike which is probably continuous with the east-west dikes of the Dillon and Dead 
Pine mines. This dike varies in width from 10 to 30 feet, and is here apparently 
nearly vertical. On its north side it connects with a thick sill-like mass, apparently 
of no great horizontal extent. This sill dips gently south. It lies in the general 
line of the Granite lode and contains an ore body which will presently be described. 
On the same level, about 450 feet south of the shaft, in the vicinity of the Cross 
lode, is another mass of phonolite, lying along the eastern side of the Granite lode. 
This is about 40 feet wide and is apparently a north-south dike. It may continue 
southward and join the sill just described, but the intervening ground is unexplored. 
Toward the north it seems to contract in width and is probably represented by a 
dike about 7 feet wide, which crosses the main drift with a northwesterly course 
about 100 feet south of the shaft. On the levels above the tenth a few irregular 
bunches of phonolite have been discovered in following the lodes, but no regular or 
persistent dike is known. 
The same basic dike known in the Monument and Dillon mines (pp. 475, 476) 
continues through the Granite with a general course of X. 20° W. It passes on all 
levels about 150 feet southwest of the shaft and meets the Bobtail lode, the line of 
junction pitching southeast. On level 6 dike and lode run together for about 50 
feet before they diverge and the dike resumes its usual more northerly course. 
Where the “ basalt ” and the Bobtail are together the dike has the usual dip of 
the lode, about 60° to the southwest. This is either a remarkable coincidence or 
else the Bobtail fissure existed prior to the basic intrusion. The lowest dip exhib¬ 
ited by the dike elsewhere on this level is 70°, also to the west. On the whole, 
however, it is practically vertical, as shown by its relative positions on successive 
levels. The dike suffers no apparent deflection in passing from the granite into 
the breccia. 
CHARACTER OF ORE. 
The ore of the Granite mine is in part metasomatically altered granite similar 
to that described in the Ajax and Portland mines. The best ore being mined at 
the time of visit, however, occurred in phonolite, as little stringers rarely over 
half an inch in width, consisting of quartz, fluorite, rather abundant pyrite and 
sphalerite, with calaverite and a little molybdenite. A vuggv structure is common, 
many of the little projecting crystals of quartz, fluorite, pyrite, and calaverite being 
coated with chalcedony. The phonolite in the vicinity of the veinlets contains 
