Bulletin - United States Geological Survey - Tapa blanda

This historic book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1912. Not illustrated. Excerpt: ... Basin, but owing to the discontinuous character of these veins the mines founded on such attempts were destined to a precarious existence. By a natural evolution, which is still going on, methods have slowly and gradually been developed to mine and mill the whole mass of rock of the ore-bearing zone, and the practice has now settled down to exploiting ores ranging from $1.25 to $3 a ton in value. This is likely to be the course of development in the northern extension of the Juneau gold belt. DESCRIPTIONS OP INDIVIDUAL PROPERTIES. The properties are described in geographic order, from Berners Bay southeastward to Salmon Creek, except that the only operating mine is described first. By no means all the prospects are described; most of the claims that have been located in the region cover stringer lodes, and these are essentially similar from one end of the belt to the other. The descriptions here given are restricted to those prospects on which considerable work has been done or which illustrate the characteristic geologic features of the occurrence of the gold ores. The amount of space devoted to any prospect, however, is no measure of its economic value. EAGLE BIVEB MINE. The Eagle Kiver mine is situated at the head of Eagle River, 7 miles inland from Lynn Canal. It is connected by a horse tramway of easy grade with tidewater at Eagle Cove, where wharfage can be procured by any of the vessels plying the waters of southeastern Alaska. The mill, whose elevation is only 200 feet above sea level, has 20 stamps and is operated by water power. A few houses and a general store are situated near the mill, and the Government has established here a post office which is officially known as Amalga. The Eagle River lode was discovered in October, 1902, by two prosp...