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Show 48 slickensided. It has a shaft 475 feet deep, with four levels. The vein of the Diana Mine dips. 60° to the east. Its direction is north and south. It averages 5 feet in width, and contains free milling ore. The shaft is 590 feet deep, with Ave levels. The Eureka, Cornucopia, and Sierra Blanca lodes were worked extensively from 1865 to 1867, but- since that time only at intervals. There is a mill connected with the Diana Mine, and at the Comanche lode there are a mill and a furnace with two improved pans for amalgamation. All lead and copper found in this connection are lost, owing to the expense of transporting the apparatus and chemicals necessary to save them. The salt aud soda used are obtained from Columbus, Nev., and Black Lake Flat, Cal. A cnstotn- miU will be erected soon. The cost of a 10 stamp mill will be about $ 25,000; with the stetefeldt furnace, $ 40,000. Freight from the railroad is 5 cents per pound. Other expenses will average as follows: Cost per ton for mining the orp, $ 1.5; for reducing, $ 20; miuing labor per diem, $ 3.50; milling labor, $ 4; runniug a tunnel on main veins, per foot, $ 4 to $ 6; sinking a shaft, $ 6 to $ L8; running a drift, $ 4. One man can stope from one to three tons of ore per day. The facilities for raising farm- produce are poor, as the soil is of coarse sand, and the water is insufficient for irrigation. Hay is worth $ 40 per ton; in the mountains there is some piiiou aud cedar timber. About 100 yards from the town of Benton there is a large hot spring, furnishing good palatable water and forming the source of a small creek. There are a few cattle in the vicinity, and some deer, rabbits, and quails. The inhabitants number about 600, besides two or three dozen Pah- Ute Indians. HARDSCRABBLE DISTRICT, COLORADO. Examined by Dr. O. Loew, August, 1874, and A. R. Conkling, November, 1875. The Hardscrabble or Kosita district lies on the western slope of the Wet Mountains, near the edge of the park known as Wet Mountain Valley, and in the neighborhood of the towu of Rosita, which is its post- office. Its nearest railroad- town is Canon City, 29 miles distant, with which it is connected by freight and stage lines. Fare to Canon City, $ 3; cost of freight, 1£ cents per pound. The country roads are good. The district was discovered and organized in 1872, since which time it has been worked at intervals. A previous examination was made in 1873 by Prof. J. J. Stevensou of this survey. The district is very large, extending north to Grape Creek, and from the Wet Mountain Valley on the west to the plains on the east. Itis in a region of rolling mountains of moderate elevation, whose general trend is north and south. The veius run northwest and southeast. Dip of main vein, 23° to the southwest. In a few cases they are natural fissure veins; generally, they are deposits which have been disturbed by volcanic forces. They are usually richer on the side of the hanging wall. The pay- streak is quite regular in form, and is seldom more than 6 or 8 inches thick. In the well defined veins, the wall- rock is a porphyry; in other cases, quartzite. Barite in white tabular crystals occurs with the ore. In age the country- rock is azoic and paleozoic. There are two classes of ore, for smelting and for milling, but principally of the latter class. Average yield about $ 80 per tou. A trace of gold has been frequently found in assaying. In the Virginia Mine, the yield of gold has been as high as 1 ounce per ton. The ores are argen- |
