MINES OF BULL HILL. 
309 
body is at least 8 feet wide and contains calaverite in little fissures and spaces of 
dissolution. In the center of this ore body appears a flat fluorite seam, 6 inches 
wide, with a central veinlet of quartz. A few feet west of this point, near the basic 
dike, wholly oxidized ore has been stoped 100 feet high. Several hundred carloads 
were taken from this part of the shoot. Many small flat seams of great richness 
occurred in this stope, all dipping northwest. 
TRILBY MINE. 
The Trilby mine is situated on the western slope of Bull Hill, just south of the 
Gold Sovereign. It is owned by the Moose Gold Mining Company and is located on 
the Trilby fraction, which contains only four-tenths of an acre. The shaft is 585 
feet deep, with 500 feet of drifts and crosscuts. Development work is in progress. 
The production is estimated at about $30,000. The mine is now being operated 
under lease by the Bayard Mining and Leasing Company. 
Weathered latite-phonolite with its characteristic pitted appearance is disclosed 
in surface workings. The short upper levels of the mine were not visited. The 
country rock of the 400-foot level and below is breccia, in general only slightly or not 
at all oxidized. A basalt dike which shows no well-defined outcrops at the surface, 
but is exposed in the Trail workings on the south and the Gold Sovereign on the north 
crosses the property near the shaft. It appears to be irregular, and while only one 
dike is seen on the 400-foot level, there are three with corresponding position, 
direction, and dip on the 480-foot level. 
Between the eastern and middle basalt dikes on the 480-foot level is a shattered 
mass of phonolite fully 15 feet wide. It contains a few fragments of breccia, but 
probably represents the phonolite dike which parallels the basalt in the Gold Sov¬ 
ereign workings. This phonolite was not observed on the 400-foot level. 
On the upper levels some ore was stoped from pockets in the basalt dike. Thirty 
feet west of the shaft, on the 400-foot level, the narrow basalt dike appears striking 
N. 15° W. and dipping 85° W. It is drifted on to the north* for 20 feet to the Gold 
Sovereign line, where the dike has widened to 6 feet. Near the line a stope has been 
made 6 to 12 feet wide and 20 feet high, at which height the values gave out. A 
15-foot winze 15 feet from the line is in good ore. 
Between the 400-foot and 480-foot levels the shaft cut a narrow oxidized seam 
which is vertical and strikes a little east of north. Just above the 480-foot level its 
dip changes to about 75°. Just south of the shaft on this level the vein widens and 1 foot 
of basalt comes in. The dike is said to be good ore at this point. Another basalt 
dike, 15 or 20 feet west of the shaft, has a steep dip to the west and strikes N. 15° W., 
corresponding in direction with the dike on the level above. It is being stoped to the. 
south and gives $30 to $60 ore. When visited the stope was 20 feet high and 30 feet 
long. Toward the south the basalt narrowed and at last pinched out completely, and 
in the breast a 3 to 4 inch quartz vein, characterized by druses and vugs and carry¬ 
ing values of $300 to the ton in tellurides and free gold, had taken the place of the 
basalt. This quartz seam may be the same as that noticed on the level above. 
Between this dike and that at the shaft is a dike-like zone of shattered phonolite. 
In the numerous minute seains tellurides occur, with occasionally free gold also, 
making this an ore body worth $20 to $50 per ton. 
