MINES OF RAVEN AND GUYOT HILLS. 
345 
UNDERGROUND WATER. 
Early in 1896 water was encountered at a depth of about 650 feet, or 9,467 feet 
above sea. The water, however, has been drained away by the drainage tunnels 
and by deep mines at lower altitude, so that the Moose is now dry. 
GAS. 
A heavy gas is exceedingly troublesome in the Moose mine. Its behavior is 
described on page 260. 
JOE DANDY MINE. 
This privately owned mine is situated near the summit of Raven Hill, at an 
elevation of about 10,400 feet. The developments comprise two shafts, each with 
five levels and about 270 feet apart. The southern or main shaft is 580 feet deep, 
and the elevation of the collar is 10,370 feet. Drifts and crosscuts aggregate about 
5,000 feet in length. The production is not known, but must have been fairly 
large. The mine was closed in 1903 and 1904. 
A north-south phonolite dike about 12 feet wide runs just east of the shaft 
house, cutting through the volcanic breccia which forms the country rock. The 
ore occurs chiefly in this dike, which is sheeted and contains disseminated pyrite; 
tellurides occur in the fractures. The dike dips steeply to the east. 
Level 1, which is 180 feet deep, shows a fissure zone which lies 80 feet west 
of the dike in breccia. This zone has been extensively stoped. Large irregular 
bodies of ore have also been stoped in the fissured breccia between this zone and 
the phonolite dike. The ore occurred in seams with fluorite in this mineralized 
rock. 
These two veins—that is, the mineralized phonolite dike and the western 
fissure zone in breccia—come together about 140 feet below the first level, the 
western vein having the flatter dip to the east. They are also said to converge 
in strike so as to join near the road north of the Joe Dandy shaft. On the whole, 
the stoped areas form a shoot continuous at least to the 480-foot level, dipping 
about 70° S. on the plane of the vein and having a maximum horizontal length of 
200 feet. 
NEW HAVEN MINE. 
Just east of the Joe Dandy mine on Raven Hill is the Eclipse No. 1 claim, 
which is owned by the New Haven Gold Mining Company. The production up to 
January 1, 1900, is given as $4,000, but a considerable amount of ore has been 
taken out since that time. The workings consist of an old incline shaft 135 feet 
deep and a vertical shaft 300 feet deep, 150 feet south-southwest of the incline. 
From these shafts about 1,500 feet of drifting and crosscutting has been done. 
The workings are entirely in dense breccia, usually but little oxidized. A 
phonolite dike 50 feet west of the vertical shaft corresponds in position to the 
Joe Dandy dike. It appears to be faulted by a fissure striking N. 55° E. and 
dipping 50° NW. The direction and amount of displacement are not shown. This 
fissure is one of a svstem of parallel fissures or joints. Another system runs N. 
10° E. and dips about 75° E. These two sets of fractures are well defined along a 
