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Show 60 are fonnd to be richer in slate. Water has been reached at a depth of 260 feet, at which level the ledges are better defined and of a superior quality. At a depth of 400 feet the veins continue good. The average yield per ton is $ 20; of this amount one per cent is silver, and the remainder is gold. The ore is worked by the wet process. It is a laminated quartz, nearly pure. Sulphurets of iron and arseuic are found in small quantities, but nothing more. The principal mines are the Helvetia, Tom Scott, Pride of the West, and Washington; all on the summit of the mountain- range. Of these, by approximation, the Helvetia has expended $ 40,000 and extracted $ 55,000; the Tom Scott has expended $ 10,000 and extracted $ 20,000; the Washington has expended $ 10,000 and extracted $ 20,000; and the Pride of the West has expended $ 5,000 and extracted $ 10,000. There are two mills running. The Helvetia has 10 stamps, weighing 650 pounds each, and making 90 drops per minute. It has no crushers and no settlers; cold amalgam is used. The engine is of 15 horse- power. The Beynold's ( custom) mill has but 5 stamps ; in other respects it is similar to the Helvetia. A 10 stamp mill will cost, on the grounds, about $ 12,000. Other expenses will average as follows: Cost of mining the ore per ton, $ 6; reducing the same, $ 2; mining- labor per diem, $ 3; milling- labor per diem, $ 3; running a tunnel on main vein per foot, $ 10; sinking a shaft, $ 25; running a drift, $ 9. The surrounding country is excellently adapted for farming and grazing, and great numbers of stock are raised. AH necessary produce is grown in the district. Barley is worth 2£ cents per pound; hay, $ 15 per ton. The timber, evergreen- oak and spruce- pine, is abundant. There is plenty of water in wells and springs, and in Vulcan Greek. The district has 300 inhabitants. A body of Mission Indians, 150 in number, live here. There are many kinds of game, including the deer, bear, rabbit, hare, quail, California lion, pigeon, gray squirrel, duck, goose, and wild hog. CASTLE DOME DISTRICT, ARIZONA. Information obtained by George R. Birnie, March, 1876. Castle Dome district lies in the foot- hills and on the western slope of a range of mountains in Arizona, 18 miles east of the post- office of Castle Dome Landing, on the Colorado River. The eastern side of these mountains has not yet been prospected. The general trend of the range is north 25° west, with other ridges running at right angles to this direction. The district, as already traced, is 2 miles in width and 7 in length, following the trend of the mountains. It was discovered and organized in 1863 by Messrs. Snively and Conner. Except a portion of 1872, it has been worked constantly since that time. The most practicable route thither is from Seven Palms railway station to Ehrenberg, 110 miles, and thence by river to Castle Dome Landing. Supplies may be sent to this point by the Colorado Steam Navigation Company. Mule- teams, for the conveyance of freight, run from the river to the mines. Cost of such transportation, $ 6 per ton. A geological investigation has been made by Professor Blake, of Connecticut. The lodes are found to run north 25° west. Some follow and others intersect the stratification. The rich veins are found in fluor spar or talc. The wall- rocks are of mixed slate and porphyry. They are |