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Show 56 silver, chrysocolla, pyrite, cerassite, chalcocite, and sphalerite, or zinc blende. Base metals are copper, lead, antimony, iron, and zinc. The Keystone lode is from 2 to 5 feet wide, with seams of ruby silver and separate seams of base sulphurets, which in this ore never mix with the high sulphnrets. The ledge is of great extent, with seven located claims. Its shaft is 185 feet deep, with 2 levels, 40 feet long. The Lone Star has a shaft 200 feet deep, with 2 levels. Gold abounds in its ore. The main qnartz ledge of the Metallic Accident is from 12 to 20 feet wide; shaft 60 feet deep. The main vein is composed of 2 parallel ledges, which are cut by a third at right angles nearly. Its ore is chiefly chloride of silver, assaying on an average $ 800 per ton. The Sixty- Three lode has 3 tunnels, averaging 250 feet in length, with shafts 200 feet deep. The Montezuma contains chrysocolla and chloride of silver. The Gerbat lode assays $ 150 per ton. Of this two- thirds is gold. Much ore has also been taken from the Gupel and Little Tiger mines. About $ 60,000 worth of bullion has been taken from the Sixty- Three lode; expenditures nearly the same. Further estimates are not reliable. There is one 5stamp mill, and a second in course of construction. Each stamp weighs 850 pounds, and makes 90 drops per minute. There are 2 furnaces and 2 5- foot combinationa pans. If much lead is present, the amalgam is strained hot; otherwise, cold. A 10- stamp mill, with 2 furnaces, will cost, including transportation, $ 45tO0O. Other expenses will average as follows: Oost of reducing the ore, per ton, $ 50; running labor, per diem, $ 4; milling labor, $ 4.50; mining the ore, per ton, $ 12; running a tunnel on main vein, $ 15; sinking a shaft, $ 25; running a drift, $ 12. No farming is done. There is some good grazing country, but not much stock. Grain is brought from California. Its cost is 8 to 10 cents per pound; cost of hay, $ 20 per ton. Timber is scarce. The water at the mines contains sulphate of lime and magnesia; but pure water is obtained from the mountains, 4 miles away. The mountain sheep, antelope, deer, quail, and rabbit are found. The Hualapais Indians live in the vicinity. About 100 whites people the district. NEW COSO DISTRICT, CALIFORNIA. Examined by Lieut. Rogers Birnie} jr^ and Dr. O. Loeie, 1875. This district is in the main ridge of the Goso range, on both slopes of the same, in the vicinity of the town of Darwin, which is post- oflice to the district. It is of great area, lying between Pauamint Valley on the east and Owen's Lake on the west. It is connected by stage with Calieate, 120 miles distant; fare, $ 30. Oost of freight from the same point, by the Cerro Gordo Freighting Company, is 5 cents per pound. The district was discovered and organized in 1874. The dip of the veins is 60°. The wall- rock is principally limestone, in addition to which granite and basalt are found. A ledge of limestone, varying from 200 feet to an indefinite width, runs northwest and southeast,' which is also the general trend of the mountains and of the veins. The country- rock is chiefly azoic. Dikes of basalt and hornblende porphyry occur in the limestone. No fossil remains are found. All ores are treated by the smelting process, which, however, is not entirely satisfactory, as much silver of the chloride is volatilized and lost Assays yield from $ 30 to $ 600 per ton. Gold is found in considerable quantities, from $ 5 to $ 140 per ton of ore. The yield of silver is |
