276 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
tunnel level with the surface, 400 feet above. At a height of 140 feet above the 
tunnel some ore is stoped at present along this dike. A small vein with a north¬ 
westerly course is traceable for a distance of 400 feet on the surface, but the basaltic 
dike does not show very clearly. The ore consists of thin quartz seams with cala- 
verite contained in breccia or basaltic* rock. The property belongs to the Stratton 
estate. 
ABE LINCOLN MINE. 
INTRODUCTION. 
The Abe Lincoln claim in Poverty Gulch, near the eastern edge of the town of 
Cripple Creek, was located in April, 1895, and the mine began to ship ore the same 
year. The property is now part of the Stratton estate and is worked under lease. 
The total production is unknown. In 1903 and 1904 the mine was actively worked 
and shipped about 30 tons per day. 
UNDERGROUND DEVELOPMENT. 
The Abe Lincoln is operated through a vertical shaft, 600 feet in depth, with 
three levels, 360, 500, and 596 feet, respectively, below the collar. The collar of 
the shaft is 9,611 feet above sea level. There are some smaller shafts on the prop¬ 
erty, of which the most important is the Arcadia, 160 feet west-southwest of the 
Abe Lincoln shaft. The Arcadia has three small levels, all above the 360-foot Abe 
Lincoln level. A large amount of horizontal development work has been done on 
levels 1 and 2. On level 1 a north crosscut extends for 750 feet from the shaft, 
well under Womack Hill. Another crosscut extends northeast of the shaft for 
900 feet to a point nearly under the portal of the Chicago tunnel, where it connects 
with a long northwest-southeast drift. Level 1 also extends about 1,000 feet 
southwest of the shaft, partly as drift and partly as crosscut. On level 2 are a 
number of drifts and crosscuts extending for about 500 feet southwest of the shaft, 
a northeast crosscut of about 400 feet to the May Queen lode, and an east crosscut 
about 2,000 feet in length toward the Gold Pass shaft. The development on level 
3 is less extensive than on the others and is entirely to the southwest of the shaft. 
GEOLOGICAL FEATURES. 
The workings of the Abe Lincoln are partly in the granite, gneiss, and schist 
complex underlying the town of Cripple Creek and partly in the breccia. The 
productive part of the mine, however, is entirely in the older rocks. The contact 
between the gneiss and breccia is usually fairly well defined, though the gneiss 
shows more or less local brecciation and the breccia near the contact contains 
abundant gneiss fragments. The contact exhibits some pvritic mineralization, but 
no ore, and has not been much explored. The general dip of the contact is south¬ 
easterly. From the surface to level 1 the angle of dip appears to be 80° or 85°. 
Below this the dip is evidently lower, the relative positions of the contact on the 
two levels indicating an angle of about 30°. Most of the ore occurs in a fine-grained 
granitic gneiss such as is exposed at the surface near the Midland station, in many 
of the street cuts in Cripple Creek, and on the dump of the Cripple Creek Enter¬ 
prise shaft, opposite the hotel. The gneissic structure, however, is somewhat less 
