320 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
30 feet. The main stupes, coming from below, follow the northwest or hanging- 
wall branch of the lode, though the foot-wall branch has been stoped to some extent 
just above level 10. At both ends of level 10 the two fissure zones approach each 
other, but the level has not been carried far enough to determine whether they 
actually join on the lines of strike. Owing to the bulkheading of the Doctor shaft 
near its mouth, the levels above 10 and below 1 were fdled with gas at the time of 
visit, and no further observations could he made on the relations of the supposed 
Doctor and Jackpot lodes. 
The pay shoots of the Doctor-Jackpot lode occupy but a small part of the whole 
length of the lode. The ore forms at least two distinct shoots, one coming to the 
surface near the Doctor shaft and one near the Jackpot shaft. They may be con¬ 
veniently distinguished as the Doctor and Jackpot pay shoots. The Doctor pa}' 
shoot lies for the most part east of the North Star basaltic dike and has been worked 
chiefly from the Doctor and Orehouse tunnels, and probably from the now inaccessi¬ 
ble northeast drifts on the Doctor levels 2 and 4. Some of the ore was seen at the 
northeast edge of the old stope, about 50 feet below the Orehouse tunnel, where 
lessees were working at the time of visit. This ore is partly oxidized, showing 
calaverite and free gold, but no tetrahedrite. The best of it, a narrow oxidized 
seam along the hanging wall, was said to carry about 3 ounces of gold per ton. The 
depth to which this pay shoot extended could not be ascertained at the time of visit, 
but it apparently ended well above the Anaconda-Raven tunnel, or Doctor level 10. 
Below it the Doctor shaft went through a nearly barren part of the lode until it 
reached the Jackpot shoot, near level 12. The Jackpot pay shoot has an unusually 
low northeast pitch, probably considerably less than 30°, which carries its upper 
limit from the surface near the Jackpot shaft to level 12 at the Doctor shaft. The 
maximum length of this pay shoot on any one level was from 400 to 500 feet, and on 
the Doctor level 15 it was stoped for 225 feet in length. It has been stoped practi¬ 
cally from the surface to the 700-foot Morning Glory level, though there are compar¬ 
atively barren portions just above the latter level and near the Doctor levels 10 and 
14. Exploitation below the 700-foot level has hitherto been impracticable on 
account of water. The width of the ore in the Jackpot shoot below the Doctor level 
10 varies from 5 to 10 feet, being widest where small cross fissures intersect the main 
lode. This is the principal pay shoot of the property and the question of its owner¬ 
ship was the subject of the legal contest which in 1901 resulted in the consolidation 
of the Doctor and Jackpot mines. 
No work has been done for some time on the Morning Glory lode and very little 
could be seen in these old workings at the time of visit. Penrose® describes the lode 
as a well-developed sheeted zone cutting breccia and phonolite, the ore containing 
gold telluride and free gold associated with quartz and fluorite. lie refers to the 
presence of several northeast-southwest fissures which we now know to be generally 
parallel with the Doctor-Jackpot lode. 
The Ingham lode is an irregular zone of Assuring in phonolitie breccia. The 
principal pay shoot in this lode occurred between the Ingham and Gregory shafts, 
and is said to have attained its greatest width, 20 feet, in the vicinity of a small 
oMining geology of the Cripple Creek district, Colorado: Sixteenth Ann. Rept. U. S. Geol. Survey, pt. 2, 1895, 
pp. 188-189. 
