154 ECONOMIC GEOLOGY OF SILVERTON QUADRANGLE, [bull. 182. 
crosscuts the New York City lode has proved of little value. This 
portion of it has obviousl} 7 been subjected to strong disturbance con- 
nected with a pronounced zone of post-mineral faulting. This fault 
appears to have a general north-and-south strike, and hades to the 
east about 20°. Where it is cut by the crosscut on level 1, about 
140 feet east of the New York vein, it shows a zone of broken and 
disturbed country rock about 12 feet wide, with a strong gouge on 
the hanging wall. This zone of disturbance aj)pears to intersect the 
New York City lode about 200 feet south of the crosscut. The lode 
and the adjacent country rock have been broken up, and the value 
of the former has been destroyed. The country rock is traversed by 
seams of soft, moist gouge, in general parallel with the line of the 
fault, but often showing considerable irregularity. Small bunches 
and stringers of ore are found, but they are not continuous. On 
level C what is supposed to be the same fault crosses the crosscut 
about 330 feet east of the New York lode. It is here less than 6 feet 
wide, and is composed of broken, decomposed country rock and wet 
clay gouge. As on level 1, the New York lode has so far proved 
worthless south of the crosscut. The New York lode, probably 
originally somewhat irregular south of the crosscut, has been dis- 
located by a fault cutting it at a small angle and thus producing 
somewhat the effect of a strike fault parallel with the vein. The 
direction and amount of movement along this fault are not known. 
Some light may be thrown on it when the Silver Lake lode, which it 
should cut, is more thoroughly opened up. If any undisturbed ore 
bodies exist in the southern part of the New York lode they probably 
lie east of the present south drift on level 1. 
In the autumn of 1899 the crosscut driven to cut the New York lode 
from the Unity tunnel, 400 feet below level C, had overshot its objec- 
tive, and upon searching back the New York was found at the begin- 
ning of the crosscut near the Silver Lake lode. This was opened by 
a short drift and found to carry a body of excellent ore similar to 
that of the upper levels. 
The ore of the New York Cit}^ lode consists of galena, sphalerite, 
chalcopyrite, and pyrite in a quartz gangue. Some of the richest ore 
occurs in a rather friable stringer near the foot wall, which contains 
black oxide of copper (melaconite), with considerable chalcopyrite and 
P3^rite. This may carry several ounces in gold, although free gold is 
very rarely seen. It is worth noting that the melaconite is found in 
the deepest workings, level C, at least 700 feet below the surface. 
The Stelzner and Royal veins resemble in their general characters 
the New York City. The course of the Stelzner is rather curving and 
irregular, but may be generalized as about N. 20° W. That of the 
Royal is about N. 35° W. It thus nearly bisects the angle between 
the Stelzner and Silver Lake and illustrates the essentially radial 
character of the whole group of lodes. This feature is still further 
