igoy ] Recent Changes in Gold Mining 121 
slate bearing gold. Open cut No. 1 shows white and pink, 
clay-like slates with iron stains and abundant limonite cubes 
and seams. The direction of the slates is N. 45° E. and part 
of the material seems to represent thoroughly decomposed, 
sheeted, coarse grained porphyry so that the deposit is proba- 
bly on a contact. The values are not uniform and at a depth 
of about 12 ft. the deposit seems to be about 20 ft. wjde, 50 
ft. long and the upper part of a rounded lens, richest in the 
center, where a 25 ft. shaft is said to have produced $30.00 
ore. To develop deeper, a shaft was sunk in the hanging 
wall. At a depth of 70 feet, it was stopped just as it began 
to cut light-colored, sericitic schists, carrying pyrite. 
The material from open cut No. 1 was all conveyed by a 
sluice to the mill, a short distance away. Although a good 
deal of gold was saved, the tailings ran $3.00 a ton and tests 
were stopped. 
Open cut No. 2 was made by recent unsuccessful hydraulic 
mining. It was, at the time of the visit, 200 feet long, 20 to 
24 feet wide and 2 to 10 feet deep. This zone pans quite uni- 
formly 18 to 20 feet wide in the cut and in cross trenches 
beyond the end of it. No assays of average samples have 
been made. There is a barren, white quartz vein, with some 
large quartz crystals, along part of one side of the zone and 
most of the material seems to have been more or less siliceous 
sericite schist, now thoroughly decomposed to purple clay or 
fine sand. At the time of the visit, 100 tons were being 
hauled over muddy roads to the mill about a quarter of a 
mile away, to make a test run. 
The machines were found to give a little less free gold in 
the tailings as the speed was reduced, and at the time of the 
visit, both sections were being run at only 60 R.P.M. The 
rate of feeding is very low, apparently only 2 tons per hour, 
and the amount of water is very large, apparently about 150 
gallons per minute. As there was no hard pebbles or 
other material in the ore to form a bed in the machine, 
it is probable that most of the gold was washed out. Even 
at this low rate of speed the coarsest tailings were very fine 
