332 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
shaft, 1,300 feet north of the Elkton and 390 feet higher, is about 875 feet deep, the 
___ ninth or bottom level being the Elkton level 5. 
I* - The Gregory shaft, 850 feet north-northeast of 
the Tornado and 163 feet higher, is 680 feet in 
depth, its bottom level being the Anaconda- 
Raven tunnel. This tunnel runs from Anaconda 
under Raven Ilill, in a direction S. 57.5° E. to 
the Gregory shaft. It then continues eastward 
until it cuts the Raven dike, about 200 feet from 
the Gregory shaft, and follows this dike for about 
900 feet to the south-southwest, connecting near 
the Tornado shaft with the main Elkton and 
Tornado shaft 
N 
M 
Tornado workings. 
LODE SYSTEMS. 
Stopes at fissure 
intersections 
BRECCIA 
Elkton shaft 
Stopes on vein 
The principal lode in the Elkton property is 
the remarkably regular Walter vein, one of the 
straightest and most persistent zones of Assuring 
in the district (fig. 34). Its general strike is 
N. 1 ° E. Near the Elkton shaft the Walter 
lode dips east at angles ranging from a mini¬ 
mum of 75° between levels 4 and 5 to a prac¬ 
tically vertical attitude between levels 7 and 8 . 
The average dip is about 84°. The dip gradually 
steepens northward until at a point about 600 
feet north of the Elkton shaft the lode is vertical 
and continues so to the Tornado shaft. North 
of the Tornado shaft and south of the Elkton 
shaft the Walter lode becomes less regular and 
is followed with increasing difficulty. On the 
south a series of fissures, ranging in strike from 
north to northeast, which are probably collect¬ 
ively representative of the Walter lode, continue 
into the granite and have influenced the depo¬ 
sition of the Thompson ore. On the north the 
Walter lode finally loses its identity in the ordi¬ 
nary minor Assuring of the country rock. 
Another important lode is the Raven, striking 
N. 20° E. and following the Raven basalt dike. 
The Raven lode and dike join the Walter lode 
between the Elkton and Thompson shafts, the 
dike being generally coincident with the Walter 
fissure zone south of the junction. On the whole 
the Raven dike is about vertical, but it is irregu¬ 
lar, and, like most dikes of its kind in the district, 
often pinches and is replaced by another dike a few feet to one side. It is a narrow 
PHONOLITE 
Co/7t&c£" 
D / \ 
GRANITE Thompson shaft 
Scale of feet 
ZOO 400 
600 
Fig. 34. —Plan showing principal dikes and fis¬ 
sures on level 7 of the Elkton mine. 
