250 ECONOMIC GEOLOGY OF SILVEKTON QUADRANGLE, [bull. 182. 
porphyry, apparently originally an andesite or latite. The contact 
between the ore and these fragments is perfectly sharp, and the latter 
often have sharp, angular corners. 
Small masses of similar ore, showing no apparent connection with 
the main body, were encountered at several points in the tunnel. 
They often contain small caves or vugs lined with crystals of quartz, 
barite, enargite, and pyrite. The country rock around such caves is 
brecciated and the crevices are filled with ore. The ore in the lower 
tunnel, consisting chiefly of pyrite, is too low to work. The longer 
diameter of the Zuni ore body apparently strikes about X. 15° W., 
and the dip is from 75° ho 80° to the west. 
There are several smaller prospects of the general type of the Zuni 
on Anvil Mountain. These are usually small irregular bunches or 
"chimneys" of ore of small horizontal and vertical extent. They 
sometimes occur immediate^ at the surface, as in a claim owned by 
John Roland, where masses of galena, showing only superficial oxida- 
tion, occur at the grass roots. In some cases the surface ore is argen- 
tiferous enargite (Dewey claim). There can be little doubt that 
many undiscovered small irregular masses of ore occur Avithin the 
altered andesites and other igneous rocks of Anvil Mountain. But 
such is their irregularity in occurrence, and so limited are they in 
extent, that small inducements are held out for extensive deep pros- 
pecting. 
Meldruin and Hammond funnels. — The success of the Revenue 
tunnel has encouraged the prosecution of other extensive tunneling 
ventures in the vicinity. The Meld rum tunnel is being driven on a 
coarse about 4° S. of W. from a point on Red Greek opposite the Sil- 
ver Bell mine through to Bridal Veil Basin in the Telluride quad- 
rangle, a distance of over 4 miles. The tunnel is 12 by 12 feet and 
had run about 900 feet in 1899. Work was also in progress at the 
western end of the tunnel line. In 1900 all work was suspended. 
The Hammond tunnel also enters from Red Creek, nearly west of the 
Yankee Girl mine and has a course of N. 80° W. It had a length of 
about 2,000 feet in September, 1900 — all in andesitic breccia. As a 
rule the rock is solid, very little timbering being required. But in the 
neighborhood of 1,000 feet from the mouth some zones of recent brec- 
ciation, dipping eastward, are cut through. These indicate faulting, 
possibly connected with the movements of landslide character revealed 
in the topography above the tunnel. 
These tunnels are evidently designed to cut the continuation of the 
Tomboy lode and other less known and undeveloped lodes traversing 
the high ridge west of Red Creek. A very large outlay of capital will 
be required to complete them. Without expressing an opinion upon 
these particular enterprises, it may be pointed out that, in so far as 
the projectors of long tunnels count upon finding richer or more 
abundant ore than is indicated near the surface, the} r are playing a 
