SMUGGLER MOUNTAIN. 191 
extensive ore deposition. Where the ore has beem taken out in large 
quantities, as is the case in the Della mine, there are developed certain 
definite zones or shoots along the Silver fault which have been remarkably 
productive, while most of the other rock along this fault contains so little 
mineral as to be practically worthless. The most important of these ore 
shoots lies directly below the Della 8. fault, where this comes into contact 
with the Silver fault. At the junction of these two on the lower side there 
are continuous stopes reaching from the Regent ground at the top of the 
hill down to the fourteenth level in the Della. These stopes are often 
immense, being in places 100 feet high, and they nearly always run quite 
up to the Della fault and there stop. The Della fault. itself, however, is 
very slightly mineralized, as a general rule not being worth prospecting; 
but low-grade ore is frequently found along it, and in places bodies which 
are workable. The intersection of the Della fault with the Silver fault 
- immediately above is practically barren, being mineralized to no greater 
extent than the Della fault itself. Another important shoot follows the 
Smuggler fault up through the Della workings. This fault grows slighter 
as it goes up, and is not always identifiable; but along it the ore shoot is 
large and continuous, and is entirely similar to that formed along the Della 
fault. The line of stopes is continuous to the bottom of the glacial drift. 
There are other well-marked shoots in the mine which have been followed 
out, and each of them seems to be connected with some slight fault or well- 
marked fracture zone, the ore occurring at the intersection of these faults 
or fractures with the main Silver fault. 
Nature of the ore—'T"he ore in the Della S. seems to be of two distinct 
varieties. One of these is a dolomite which has been altered and softened, 
and which contains a paying amount of metals; but there is no large 
amount of vein material, and the process of mineralization seems to have 
been in large measure a replacement. The dolomite is yellowish brown in 
color, and is blotched with barite and sometimes with lead. The more 
common variety of rich ore is very high in baryta and poor in lead. It 
generally occurs in veins, made up chiefly of coarsely crystallized barite, 
and called “spar streaks.” In this barite there occurs a small and variable 
quantity of gray sulphide, which is probably in part, at least, tetrahedrite 
or tennantite. This sulphide goes by the name of ‘gray copper,” and 
occurs in blotches or in small vein fillmgs which are not persistent. - A very 
