MINES OF GLOBE HILL. 
283 
A little farther north, on the main road, is the Mayflower, the vein of which 
follows an east-west dike, and is said to have produced some good ore. The Bolivar, 
about 1 mile west of Gillett, is located on one of the principal phonolite dikes. 
Here, too, galena is said to occur. 
One mile west' of Gillett a number of northwesterly trending flat phonolite 
dikes cut the granite. The property of the Lincoln Mines Mining and Milling 
Company is located here. Small shipments amounting to about $4,000 have been 
made. The mine is developed by a vertical shaft 300 feet deep, and three levels, 
75, 160, and 300 feet below the collar, have been turned. The ore shipped is said 
to have been extracted from a northeast vein dipping steeply northwest; on the 
lowest level this vein does not appear, and it has possibly been deviated by a 
phonolite dike dipping 30° SW. A short distance westward is the Normandy shaft, 
200 feet deep, intersecting a phonolite dike, and the Hawkeye, sunk on a brecciated 
dike containing much fluorite. Close by the Hawkeye a narrow basic dike of 
doubtful original character is met trending southwesterly, and is said to contain 
some values. 
About half a mile east of Gillett, at the Great Western claim, a northeasterly 
trending zone with small seams of fluorite has been opened, and is said to contain 
low-grade ore. Some prospecting has been done on phonolite dikes at the southern 
point of Trachyte Mountain. A long tunnel is being driven under the summit of this 
mountain through granite in the hope of striking the supposedly mineralized vent 
connected with the mass of phonolite which covers its top. 
A number of small shafts and tunnels are located on the western slope of 
Cow Mountain, east of Trachyte Mountain, and low-grade ore is reported from 
some of these places. 
(JIjOIJE IIILiIi. 
GEOLOGICAL FEATURES. 
Globe Hill rises on the southeast side of Povertv Gulch to an elevation of 
•/ 
about 10,450 feet, and its broad, gently rounded summit overlooks the town of 
Cripple Creek. It is composed of volcanic breccia of normal type, but throughout 
very much oxidized and containing much limonite and kaolin. Dikes are notably 
absent. The rock is extremel}' shattered by seams and short veins, having many 
different directions and dips and often filled with quartz. The adjoining western 
part of Ironclad Hill is geologically similar to Globe Hill, but contains a number of 
strong veins with northeasterly trend and characterized by well-crystallized smoky 
comb quartz. Here, too, the breccia is thoroughly oxidized over a considerable 
space, and this oxidation descends at least 700 feet to the level of the Chicago 
drainage tunnel. Nothing similar to this deep and extensive oxidation of the 
rock occurs in any other part of the district. It has been assumed by Penrose and 
Rickard, who have described these occurrences, that they are due to the decom¬ 
posing action of thermal waters. In a general way this is probably correct. (See 
p. 284.) Ironclad Hill, like Globe Hill, is characterized rather by irregular masses 
of low-grade ore chiefly confined to the surface than by large ore shoots following 
the veins. 
