CHAPTER V—MINES OF BULL HILL. 
GENERAL INTRODUCTION. 
Bull Hill occupies a central position in the complex of volcanic hills and many 
important mines are located on its .southern slope. An isolated area of brecciated 
granite occupies its western slope, while over the eastern and southern parts breccia 
prevails. Several bodies of latite-phonolite appear in the breccia. As shown by 
mining developments, these masses as a rule form flat intrusive sheets. In the 
southern area especially the various shafts sunk in it have everywhere shown that 
breccia appears below latite-phonolite at a depth of 300 or 400 feet. Several basic 
dikes with a northwest or northeast trend cut across the southern shoulder of Bull 
Hill, and at least one phonolite dike with northwest trend is prominent in the Logan 
and Dante mines. 
The Wild Horse lode outcrops near the summit and follows approximately the 
contact between granite and breccia, though in lower levels it is entirely in granite 
or granite breccia. On the south or southwest slope a general shattering has 
occurred, as shown by the complicated veins of the Dante, Gold Sovereign, War 
Eagle, and other smaller mines. The strongest fissures appear on the prominent 
south or southeast shoulder of the hill in the northerly trending Blue Bird, Orpha 
May, and Mineral Rock lodes. The Orpha May lode is traceable as a closely linked 
and very productive system for three-fourths of a mile from the Modoc mine, 
by the Last Dollar, Rubie, and Orpha May veins. A basic dike with a north- 
northwest trend cuts across the Orpha May and has in places proved very pro¬ 
ductive. The nortneast slope of Bull Hill contains few lodes of importance. 
WAR EAGLE AND RAMONA MINE. 
The recently opened War Eagle and Ramona property is situated on the south¬ 
western slope of Bull Hill, about 250 feet below the summit. It is worked by 
lessees, who in 1903 extracted a considerable amount of ore from a'surface pit and 
in 1904 opened a vein system found below this surface ore. The production from 
April, 1903, to April, 1904, is stated to be about $45,000. The developments 
consist of the War Eagle shaft, 58 feet deep and connecting on that level with 
the 150-foot Ramona shaft, situated 300 feet to the northeast. The elevation 
of the collar of the War Eagle shaft is about 10,528 feet. The workings are chiefly 
contained in the somewhat shattered granite of Bull Hill, but also reach, near 
W ar Eagle shaft, the breccia contact, which here is sharply defined. A drift has 
been run on this contact for about 100 feet northwest of the shaft. All of the 
rocks are very much oxidized. 
362 
