RANSOME.] DIVES MINE. 165 
ore of the lower levels, assays of ounces to the ton having been 
obtained. This metal, however, formed an exceedingly small propor- 
tion of the whole output, which was chiefly in silver. 
Owing to the cessation of mining and the accumulation of ice and 
mud in the abandoned workings, it was impossible to make any satis- 
factory study of the detailed structure of the lode. Small stringers 
aud gouge seams are said to come in from the foot wall (southwest), as 
in the Silver Lake lode. 
The ore from the North Star was sorted and packed on burros down 
to the road in Big Giant Gulch. From this point wagons carried it 
down to the Crooke mill, near the mouth of Boulder Gulch. Built to 
treat ore from the Polar Star mine, on Engineer Mountain, this mill 
was original!} 7 equipped with a modification of the Augustin leaching 
process. Its present plant consists of 1 7 by 10 Blake crusher; 10 
1,000-pound stamps, dropping 5 inches at 90 to the minute; 5 Harz 
jigs, 1 Wilfley table, -'i Frue vaimcrs, and 6 canvas tables. Power is 
furnished by a 60-horsepower engine and boiler. The capacity of the 
mill is about 50 tons. It is evident that ore so irregularly mined, and 
milled under such disadvantages, must have been high grade to have 
paid for extraction and treatment. Much ore that might have been 
profitably milled in a belter-equipped mine has undoubted^ gone on 
the dump oi- remained in the slopes. 
Dives mine. — This claim joins the North Star (King Solomon) on 
the southeast and is on the same lode. The workings here are not 
extensive and the mine has not ye1 produced much ore. It contains 
two stopes, one on the Dives and the other on the Shenandoah claim. 
The genera] character of the lode resembles that described in the 
North Star. It is an irregular stringer lead, without gouge and with- 
out regular walls. The ore is argentiferous gray copper (perhaps not 
a normal tetrahedrite, as it carries some lead), galena, chalcopyrite, 
and pyrite, in a gangue of quartz and barite. Small vugs lined with 
quartz crystals are common. Much of the vein matter is merely 
altered country rock, in which the outlines of former porphyritic crys- 
tals of feldspar are still recognizable. The ore-bearing stringers are 
distinctly cut by one, and possibly two, sets of later stringers of 
quartz, generally parallel to the course of the lode. These later 
stringers, as far as observed, are small, and are usually barren, 
though some carry a little ore. Comb structure is particularly com- 
mon in them. A well-marked spherul it ic st ructure was noted in some 
of the ore. More or less rounded, irregular lumps of tetrahedrite 
were surrounded by a skin of chalcopyrite, from which, as a founda- 
tion, the quartz had crystallized radially outward (see PL XI, C). The 
high-grade ore may run about 200 ounces of silver. On the Dives 
claim there is a solid vein of barite, 6 to 7 feet wide, on the hanging 
wall of the productive lode. Its relation to the latter was not deter- 
mined. Its presence and the occurrence of barite within the ore body 
