The Cordova daily times., 1918-02-20
Resume of Mining
 Prince William Sound

of chalcopyrite than on the hanging wall side but it's gold content Is lower. In the early years of operation, when only the richer copper was handled at profit, the ore was mined through a glory hole and stopes worked on the shrinkage system. For a few years after the old stopes had been emptied na particular method of mining was employed putin 1913 a filling system was adopted whereby the old opening were cribbed and filled and the ad- joining ore mined.
 For the first few years the waste for filling was obtained from crosscuts and raises in the hanging wall Owing to the high cost of the filling and to the fact that there was considerable methane in the graphite slate of the hanging wall, which accumulated in the raises and resulted in several &C., cidents, the filling system was changed. The filling is now obtained from glory hole, TOO feet from the ore body. It is drawn through chutes to the 100-foot level and hauled by a gasoline motor to the mine, where it is distributed by watse chutes to the particular workings where it is need i the stopes filled as the ore is mined The ore is tTammed by hand to the shaft, hoisted, and stored in bins from which it is loaded by an aerial tram way directly to the ships hold This year the work has been confined to those parts of the mine above the third level and to diamond drilling.
 In the main power plant there is a 250-hp Geary water-tube boiler and two 7O-hp. Brownell locomotive-type boilers. The latter are used as aux diaries in case the Geary is closed down. Crude oil is used for fuel, the storage tank having capacity of l. 500 barrels. The hoist is 10 by 12 inch, duplex-geared, double-loose drum, Vulcan hoist The compressor is a Nordberg two-stage, cross-com- pound condensing machine with 12 and 24 inch steam cylinders. The air cylinders are 12 3-4 and 21 inches in diameter and the stroke is 36 inches | IngersOll-Rand jack hammers, stope hammers, and type CLIO machines are used underground.
 The tramway is Frederick & Bas- com design. The capacity of the buckets is IA cubic feet each and the capacity of the tram is 200 tons per hour with rope speed of 450 feet per minutes. The diameter of the track cable on the loaded side is 1 5-8 inches, on the empty side 1 inch, and that of the traction cable is five-eighths of aninch.
 FdaIeo Mining Go.
 The company is operating a group of A lode claims on the southeastern shore of Fidalgo bay, about one-half mile from the beach.
 The ore, chiefly chalcopyrite lies in a shear zone through slate, graywacke, and greensboro, and strikes N. 30 de- grees w., with dip of 67 degrees NE. Two drifts have been driven along the shear zone to open the ore with raises through to the surface. The ore oc- CUTS in lenses of variable size through this zone, the largest so far opened being 6 feet wide. The elevation of the upper drift in 962 feet; the lower one is 100 feet below this. About 500 feet of track has been laid from the lower level to the ore bins, which are connected with the bunkers on the wharf by 2,000 Riblet balanced tram. way. The buckets have capacity of 10 cubic feet each and there are three towers. The track cables are 1 inch in diameter and the haulage cable three-eighths of an inch. The upper bins have a capacity of 50 tons and the lower 500 tons. The ore Is hand sorted and shipped to the Tacoma smelter. This year power plant has been installed containing a 3S-inch Pei ton wheel belted to an Ingersoli.Sa gent compressor having a capacity oi 3S5 cubic feet of free air per minute The water for the wheel Is conveyed 1900 feet in a wcoden-stave pipe through which fall of 400 feet il obtained. The upper 500 feet of tn, line is built of 12-inch pipe; the lower of 8-inch. Ingersoll-Rand jack ham mers are used underground.
 - Galena Bay Mining Go. ? The assessment work was the onl, l development reported at the Galeni } Bay mine, on the ridge between Galeni i. and Boulde bays.
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