BATTLE MOUNTAIN MINES, WEST GROUP, AND OUTLYING PROSPECTS. 495 
and did not appear on the lower levels. The Sunset tunnel has opened the same 
vein system, with an additional north-south vein from which some good ore has 
been stoped ; but this part of the property has produced a smaller quantity of ore. 
CARBONATE QUEEN MINE. 
This property consists of a claim adjoining the Eclipse on the east and is owned 
by the Ophir Mining and Milling Company. It is developed by a tunnel entering 
under the Midland trestle, 40 feet above the Eclipse and by a shaft 500 feet deep, 
350 feet east-southeast of the Eclipse shaft, the elevation of the collar being 9,910 
feet. Drifts aggregate about 1,500 feet. No work was done in 1904. The workings 
connect in part with those on the Eclipse. The production is considerable, but the 
exact amount could not he ascertained. The Carbonate Queen has the same flat, 
westward-dipping vein as the Eclipse, and some ore has been extracted from it. 
There is also a north-south vein and several others trending east and west. The 
country rock is breccia. 
BIG BULL, BRIND, AND STRAUB MOUNTAINS AND GROUSE IIILE. 
. Big Bull Mountain is a large flat-topped granite mountain 14 miles east of 
VTctor, rising to an elevation of 10,826 feet. Its northern slope is covered with 
breccia, latite-phonolite, and phonolite. Very few basic or phonolite dikes were 
noted. Regarding the relations of these rocks in depth there is little information, 
except that the contact between breccia and granite is steep in some places at 
least, as for instance at the Safety prospect shaft. 
While there are many prospects scattered over the volcanic areas and a few 
in the granite, there have been no developments of importance thus far and there 
is practically no production. Encouraging assays have been obtained in many 
places. 
Brind Mountain, 10,500 feet above the sea, is situated 1| miles south of Big 
Bull Mountain. Pikes Peak granite is the principal rock. On the north side it is 
cut by a long dike of diabase and by another of phonolite. Some prospecting has 
been carried on in the latter, but so far as known without .valuable result. 
Straub Mountain, the elevation of which is 10,050 feet, lies 14 miles west of 
Brind Mountain. It is covered with the sandy detrital deposits discussed on page 22, 
and in these lie several intruded masses of phonolite. The summit is occupied by 
one of these bodies, in which many prospects have been opened. It is said that 
the phonolite contains low-grade gold ores and attempts were made at one time 
to work these by means of a small cyanide plant situated near the summit of the 
hill. 
Grouse Hill rises to an elevation of 9,800 feet, and is 14 miles west of Straub 
Mountain, from which it is separated by the deep gash of Wilson Canyon. Its 
geological structure is similar to that of the hill just described, though the body 
of phonolite occupying its upper part is very much larger than the'mass on Straub 
Mountain. A great number of prospects are opened on its east and south sides, 
but nothing of well-established value has as yet been encountered. Teals tunnel 
