180 ECONOMIC GEOLOGY OF SILVERTON QUADRANGLE, [bull. 182. 
the abundant rhodonite, by oxidation, generally gives a black color. 
Underground it is seen that these lodes are as a rule composed of 
alternating bands or streaks of ore and barren pink rhodonite. The 
ore bodies may vary from a few inches up to 30 feet in width. They 
are sometimes continuous for long distances, but are elsewhere plainly 
lenticular. The miner has sometimes followed a single ore streak for 
a considerable distance without suspecting that another ore body lay 
close alongside, separated from him by a partition of rhodonite. The 
ore streaks frequently show irregular banding, by deposition, and 
often contain small vugs. The ore minerals are sphalerite, galena, 
P3 T rite, chalcopyrite, free gold, sulphobismuthites of lead and silver, 
and sometimes small amounts of tetrahedrite, molybdenite, native sil- 
ver, and native copper. The sphalerite varies from dark brown to 
rosin-yellow in color, and usually about equals the galena in amount, 
and exceeds the other ore constituents. The light-colored zinc blende 
often accompanies ore rich in free gold. The gangue is quartz, rho- 
donite, and locally a little nuorite and calcite. The rhodonite, which 
forms the "partitions of pink" between the ore bodies, is tough and 
compact, and varies from light pink to rose-red in color. It is always 
poor in ore minerals when it occurs in large masses, but small amounts 
of rhodonite may be embedded in the richest ore. 
In spite of the banding on a large scale shown by the veins, they 
are as a rule simple, thick plates of vein filling, frozen to the walls 
and containing very few horses of country rock. Of low grade as a 
whole, they have hitherto been mined for the richer portions, carrying 
free gold. 
Sunny side Extension mine. — This property joins the Sunnyside on 
the northeast, and is on the same lode. The main lode dips southeast 
about 75°. Just northwest of it is a second lode, nearly parallel and 
bearing to it a relation similar to that which the No Name bears to 
the Sunnyside. This second lode also dips southeasterly, but in 
places it is as flat as 40°. It probably joins the Sunnyside vein in 
depth. 
The Sunnyside Extension mine was first extensively worked in 1886, 
when $3,965 worth of ore was shipped. It was worked steadily until 
1892, producing in all $337,687. After a short intermission it was 
again worked up to about 1897, but the output for this period is not 
known. The mine is now (1900) being again reopened. The ore 
resembles in general character and occurrence that of the Sunnj^side 
mine, but is more irregular in its distribution. There are three main 
levels, all connecting with the surface by adit tunnels. Above level 
2 is a stope about 30 feet wide, 200 feet long and 125 feet high, which 
is said to have been practically all ore. Some very rich ore has been 
taken from this mine, carload lots running as high as 74 ounces of 
gold per ton, together with silver and lead. The gold occurred very 
largely free, and, as in the Sunnyside, was limited to certain pockets 
