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Show 55 yield is from $ 50 to $ 60. Water- level has been reached in all shafts. In the Ingersoll Mine hot water has been encountered. The principal ores are chloride of silver, or cerargyrite, brittle silver, or stephanite, pyrargyrite, polybasite, free gold, native silver, argentiferous galena, copper glance, zinc blende, and iron and copper pyrites. Antimony, copper, and lead are the chief base ores. Gold occurs in all of the silver ores, and forms an important share of their values. Only two mines, the Belcher and the Imperial Empire, were visited. The shaft of the Belcher is 850 feet deep vertical, then 750 feet inclined. Work is being prosecuted on the 1,600- foot level. Four hundred tons per day are extracted. This amount is the working capacity of the mills at the time of high water in the Carson River. At other seasons not more than 150 or 200 tons can be reduced, and less ore is then extracted. Since 1860 166,000 tons have been takeu from this mine. The ledge varies in width from 25 to 50 feet. Its strike is northeast and southwest. The ore is found in pay- streaks, and also occurs as impregnation. In the Imperial Empire the vein is 25 feet wide; the strike northeast and southwest; the shaft2,000 feet deep; the average yield, 40 tons per day of good milling ore. Since work began on the Belcher, in 1860, silver and gold bullion to the value of $ 28,000,000 has been extracted, and dividends have been paid to the amount of $ 15,000,000. The yield for 1874 was $ 9,150,000 j in 1875 it was $ 200,000 per month. In 1870 the total product of all mines in the vicinity did not reach that amount. California is the chief source of supply for produce, & c. The nearest timber of importance is in the mountains near Caiion City. Some water is found in the mines, but the whole supply for Virginia City is not grgat. HTJALAPA1S DISTRICT, ARIZONA. Examined by Dr. O. Loew, August, 1875. The mines of this district are in the Cerbat range of Arizona, principally on the western slope. The trend of the mountains is northwest andsoutheast; of the district and of the veins, nearly the same. The croppings cover a belt 10 miles long and 2 miles wide, lying between Sacramento Valley and Hualapais Valley. Mineral Park is the district post- office. The stage- tine from Prescott to Hardyville passes here. Cost of freight overland from California is 8 cents per pound; by vessel via Yuma to Hardyville, and thence by wagon 30 miles to Mineral Park, it is 5 cents per pound. The roads are very good. This district, formerly called Sacramento district, was discovered and organized in 1863, but, in consequence of Indian troubles, has been worked but desultorily. These mines were examined by Lieutenant Wheeler in 1871. The veins are well defined. Their angle of dip is from 70° to 80°. They appear to be richer where the country- rock is more micaceous. Some are contact veins, between syenite foot- wall and porphyry hanging- wall. The vein matter is chiefly quartz. The rock is azoic. Its principal constituents are granulite, granite, apatite, talcose schist, syenite, and quartzite, tinged with iron and manganese. Dikes of intrusive porphyry rock are occasionally met. There is but little free- milling ore; it is chiefly roasting. Assays show a yield of $ 60 to 81,400 in silver per ton. Some gold occurs with the silver, and in some mines the gold predominates in value. The ores are galenite, pyrargyrite, or ruby silver, cerargyrite, or chloride of |