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Show 62 with the slates in which they are situated. The gangue consists of quartz and calc spar, with talcose slate occasionally intermixed. The adjacent rock is azoic and volcanic. No shells are found. The neighboring mountains are largely made up of trachyte and rhyolite. Assays • average $ 50 per ton. The ores are reduced by roasting and milling. In the roasting process, sulphur and salt are added. The salt is obtained from the extensive deposits in the valley of the Virgen River. Sulphur was recently discovered on the Muddy River. The silver ores consist of sternbergite, with some argentiferous galena and copper glance. Chloride of silver has been found, but only at the surface of the lodes. Iron and copper pyrites occur with the silver ores. The principal base metal is iron. Copper and lead, with some antimony, are also present. Assays show the presence of gold in the silver- ores. The principal mine is the Tekehetukup, whose vein is from 6 to 8 feet wide. Its shaft is 200 feet deep, with two levels, 200 feet and 264 feet in length. The ore is found in pockets of various sizes. The Queen City Lode contains galena in talc. Its shaft is 95 feet deep; its vein is 2 feet in width. There is one mill of ordinary structure, with roasting-furnace attached. The stamps make eighty drops per minute. There are four pans and two settlers in the works. The amalgam is strained cold. Up to date, about $ 100,000 has been extracted from one mine. A 4- stamp mill, at the mines, will cost $ 1,500. Other expenses will average as follows: Mining the ore, per ton, $ 5; reducing the same, $ 25; mining labor per diem, $ 4; milling labor, $ 2.50; running a tunnel on main vein, $ 20; sinking a shaft, $ 25; running a drift, $ 15. One-half of a ton of ore can be stoped by one man in one day. Grain is worth 7 cents per pound; hay, $ 70 per ton. Las Vegas, Hev., is the source of supply. Timber is very scarce. The Colorado River furnishes the requisite water. Mountain- sheep and rabbits are the principal kinds of game. There are about a dozen men in the district, besides a few Fah- Ute Indians. CBEEO GOEDO DISTEICT, CALIFOENIA. Examined by Dr. O. Loew, October, 1875. The mines of the Cerro Gordo district are northeast of Owen's Lake, on the east and west slopes of the Inyo Range, which is the southern extension of the White Mountains. The district covers about 4 square miles. Its croppiugs are scattered over 800 acres or more. The trend of the mountains is northwest and southeast; of the district,- the same. Its post- office is Cerro Gordo. It is 150 miles from Caliente, the present terminus of the railroad, with which it is connected by a freight-line ; cost of freight, 5 cents per pound. The country roads are rough. This district was discovered in 1866, by Pablo Flores and companions. It was organized in 1867, and has been worked continuously since. Previous geological examinations have been made by Clarence King, by the California Geological Survey, and by a former party of this survey. The lodes run northwest and southeast. The lead- veins, on the west side of the range, correspond with the stratification of the country rock, which is of Silurian limestone; the copper ores occur in syenite, on the east side of the mountains. The veins are true fissure- veins, in some cases contact- veins between limestone and slate. A thin seam of clay frequently covers the foot- wall. At times calcite and day are found in the vein- matter, and these are intermixed with galena and the • carbonates. The richest silver ores generally lie near the center of such |