MINES OF RAVEN AND GUYOT HILLS. 
317 
on the 550-foot Morning Glory level, shown in fig. 31 (p. 316), which explores the 
lode for a distance of 2,900 feet. Northwest of these drifts are comparatively 
short drifts on the nearly north-south Morning Glory lode and on an intersecting 
fissure zone of the same general trend as the Doctor-Jackpot lode. East of the 
Morning Glory shaft are numerous nearly north-south drifts on the Smith-Reilly 
or Elizabeth Cooper, North Star, Walter, and Ingham lodes, and some northeast- 
southwest drifts on the Mattie 1). lode. The general plan of these drifts as seen 
on a single level is well shown in fig. 31. The principal crosscut of this group of 
workings is the Ingham, on the 550-foot Morning Glory level, which extends from 
the Morning Glory shaft to the eastern edge of the property. 
GEOLOGICAL FEATURES. 
The general country rock is breccia, of the type prevalent in Raven Hill, and 
is all indurated or otherwise altered. It contains abundant fragments of phono- 
lite and in places consists chiefly of this rock, fragments of other rocks being locally 
subordinate. No granite fragments were seen. Some of the breccia is much 
shattered, as may be well seen at the south end of the Walter drift, on the 550-foot 
Morning Glory level. The rock is here an incoherent, porous mass of angular 
fragments which are usually less than 6 inches in diameter. The loose fragments 
are not original breccia fragments, but are the result of local shattering of breccia 
previously solidified' into a firm rock. The breccia is cut by numerous irregular 
dikes and sills of phonolite which appear to have no significant relations to the 
ore. Several small basic dikes, mostly with north-south trend, are encountered 
in the Doctor-Jackpot workings. The only one of these of any economic interest 
is the North Star dike, which has produced some ore in the North Star workings, 
just north of the Doctor-Jackpot line. This dike is well exposed in the Anaconda- 
Raven and Standard tunnels. Its general course is N. 10° E., and it is practically 
vertical. It is usually 2 to 3 feet wide, but like other basic dikes in the district, 
occasionally pinches out and reappears a few feet to one side of the line previously 
followed. The rock of this dike is generally soft and decomposed. 
A feature in these mines of much interest is the presence of small quantities of 
bituminous coal in the breccia in the form of irregular bunches and veinlets. It 
occurs at several points on the 550-foot Morning Glory level, particularly in the 
Ingham crosscut near the Smith-Reilly lode. It is found also in the Doctor-Jackpot 
lode near level 15 of the Doctor, just northeast of the Doctor shaft. It here forms 
a narrow seam, 3 or 4 inches in width, filling one of the fissures of the Doctor-Jackpot 
lode and closely associated with the ore. 
LODE SYSTEMS. 
The lodes exploited in the Morning Glory and Doctor-Jackpot workings fall 
into two general classes. The first of these is a system of fissures striking nearly 
northeast and dipping to the northwest at angles of approximately 50°. Belonging 
to this class is a lode northwest of the Morning Glory shaft whose name was not 
learned, but which may be called the Galeta lode, from the Galeta inclined shaft 
sunk upon it; the Doctor-Jackpot lode; and the Mattie D. lode. The lodes of the 
13001—No. 54—06-22 
