494 GEOLOGY ANT) GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
UNDERGROUND WATER. 
Water was first reached in the Gold Coin mine at a depth of 369 feet or 9,396 
feet above sea level. The maximum flow of 900 gallons a minute was attained at 
a depth of 1,000 feet. In July, 1903, the water was being held 9 feet below the 
1,100-foot level by pumping 740 gallons a minute and by maintaining two bulk¬ 
heads in wet crosscuts on level 10. The pressure on one of these bulkheads was 
93 pounds and on the other 84 pounds, corresponding to heads of about 214 and 
193 feet, or to water surfaces 8,979 and 8,958 feet, respectively, above sea level. 
These conditions had remained unchanged for about a year. 
In October, after the opening of the El Paso tunnel, the pressure on the bulk¬ 
heads began to decrease and in February, 1904, it had fallen to 74 and 68 pounds. 
In March level 12 was recovered by pumping 700 gallons a minute for ten days and 
was then kept open by a discharge of 500 gallons a minute. The bulkheads were 
still left in level 10 and sustained pressures corresponding on April 16 to water 
surfaces about 8,919 and 8,901 feet above sea level, respectively. At this time the 
pumps were raising 490 gallons a minute to keep the bottom level open. 
SUNSET-ECLIPSE MINE. 
The Eclipse, situated at an elevation of 9,700 feet in Eclipse Gulch, just east 
of the Elkton mine, was one of the earliest producers of the district and is briefly 
described by Penrose on page 207 of his report. It is developed by a tunnel at an 
elevation of 9,672 feet and a shaft 500 feet deep situated 70 feet south of the tunnel; 
the* elevation of the collar is 9,689 feet. The Sunset mine, consolidated with the 
Eclipse, is opened by a tunnel at about the same elevation as the Eclipse tunnel 
and about 400 feet south of it. There are also some surface workings on the ground 
of the company on the hill slope north of the Eclipse. The total developments 
amount to several thousand feet. The total production probably exceeds $100,000. 
Water has caused much inconvenience. In March, 1904, the shaft was filled to 
an elevation of 9,465 feet or 224 feet below the collar. Gas filled level 1 so that 
only the tunnel was accessible. The mine was worked in a small way by lessees. 
The country rock is throughout a much oxidized volcanic breccia. The veins 
exposed in the tunnel are as follows: A north-south vein, dipping steeply westward, 
175 feet east of the portal, has been drifted on for a hundred feet north and south 
from the tunnel. The stupes on this vein were 100 feet long, but descended only 
40 feet below tunnel level; the ore was taken out 2 or 3 feet wide and consisted of 
kaolin with pseudomorplis of gold after calaverite. No ore has been found on this 
vein in the lower workings. Forty feet farther east in the tunnel is a flat vein 
dipping 45° or less to the west. This vein is not known below in the Eclipse mine, 
but is prominent in the Carbonate Queen. Ten feet east, of this a third vertical vein 
is cut; this is the only vein which has proved productive in the lower levels of the 
shaft. There are two ore shoots 80 and 40 feet long on it, both of which are said to 
extend down to level 5. A hundred feet north of the tunnel the flat vein, the vertical 
north-south vein, and a vertical east-west vein intersect and here a large shoot of 
ore 90 feet high occurred; it was chiefly, however, confined to the vertical vein 
