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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ... slate. From level 10 to level 6 it is wholly in the slate, and from level 6 to within 150 ft. of the surface it is VOL. LXIII. 30. in schist, and outcrops in a metagabbro dyke. Other mineralized zones, intersected with numerous quartz stringers, are found in the slate and metagabbro dykes in the hanging wall of the main orebody. The only orebody developed so far is the one that lies on or near the main contact. Fio. 3.--Section Through Perseverance Orebody 1000 Ft. East Of No. 1 Shaft. The gold occurs usually free, is fairly coarse, and is generally found near the contact of the sulfides with the quartz. The predominating minerals are zinc-blende, galena, arsenopyrite, pyrite, and pyrrhotite, named in order of their importance as gold carriers. There is, on an average, as much silver by weight as gold in the ore. History Gold was discovered in Silver Bow Basin near Perseverance in 1880 and placer mining was carried on for several years, in the gulches and basins, with more or less success. Several attempts were made to work the small rich quartz stringers, transporting the ore by aerial tramways to small stamp mills, but owing to the shortness of the summer season and the small tonnage treated they were not successful. About the year 1900, the late Mr. Joseph Gilbert bought the Perseverance claims and, with the assistance of the late Col. W. J. Sutherland, the Alaska Perseverance Mining Co. was formed. This company drove the Alexander cross-cut, the orebody being intersected at a point 2000 ft. (609 m.) from the tunnel portal. Drifting was done both east and west on the orebody, which work demonstrated an orebody of sufficient size and value to warrant the erection of a 100-stamp mill just below the portal of the tunnel. This mill commenced operations duri...