bansomb.] SILVER LAKE MINE. 155 
brought out by the fact that the Stelzner and the Royal with its two 
branches, called the right-hand and left-hand Royals, are, in the lower 
levels, all ramifications of a single vein, which in turn is a branch of 
the Silver Lake lode. Both the Royal and the Stelzner veins dip to 
the northeast. The Royal is very nearly vertical, while the Stelzner 
has an average dip of 75° to 80°. Consequently the line in which the 
two lodes join pitches southeastward. On the other hand, the much 
flatter dip of the Silver Lake lode causes the lines of junction between 
it and the veins of Group II to pitch to the northwest. As a result of 
these conditions the Stelzner and Royal join the Silver Lake on level 4 
as separate veins. On level 3 the Stelzner, Royal, and Silver Lake 
lodes all come together at about the same point. On level 1, however, 
the two veins unite about 200 feet before they join the Silver Lake lode 
as a single vein. The junction of the Royal-Stelzner vein with the 
Silver Lake is similar to that described in the case of the New York 
lode. On level 2, at the point where the two veins come together, no 
clay seam could be seen separating them, although a little farther 
northwest the Silver Lake lode shows well-marked seams of soft, wet- 
gouge on foot and hanging walls. At the junction there is much 
brecciated country rock, cemented b}^ quartz which is full of small 
vugs. 
On level B, north drift, the combined Royal-Stelzner vein has been 
stoped for about 400 feet, to a point where the lode diminishes to a small 
stringer. A short crosscut to the west, however, discovered the con- 
tinuation of the lode. There is apparently no fault at this point. 
The lode has merely pinched out and is succeeded hy a slightly over- 
lapping parallel fissure in the manner already described. 
The productive portions of the Stelzner vein are sometimes 10 or 12 
feet in width. The Royal is usually somewhat narrower. The ore in 
both veins is usually solid and not accompanied by any considerable 
gouge. Post-mineral movement along the fissures is not, however, 
wholly lacking, and is best seen where the veins pinch to very narrow 
dimensions. As usual, in this mine the country rock near the veins 
has not undergone any alteration which can be recognized by the eye 
as evident and characteristic. The ore of the Stelzner and Royal 
veins consists of abundant galena, with sphalerite, chalcopyrite, and 
P3 T rite in a gangue of quartz. A little dolomite occurs in the vein, 
usually associated with included fragments of country rock. The 
quartz also shows greenish patches of chlorite, which are regarded as 
an indication of good ore. Chalcopyrite is less abundant than in the 
New York vein. The ore may carry 2 or 3 ounces of gold and is of 
higher grade than that of the Silver Lake lode, although somewhat 
inferior as a whole to the ore of the New York vein. 
The E. G. S. is a small vein approximately parallel with the Royal 
and lying about 60 feet to the northeast of it. In its general charac- 
ter it resembles the Stelzner and Royal, but is smaller. Its junction 
