File:Annual report of the United States Geological Survey to the Secretary of the Interior (1895) (14779161724).jpg

Identifier: annualreportofun1711geol (find matches)
Title: Annual report of the United States Geological Survey to the Secretary of the Interior
Year: 1880 (1880s)
Authors: Geological Survey (U.S.)
Subjects: Geological Survey (U.S.) Geology Water-supply Forest reserves Mines and mineral resources
Publisher: Washington : G.P.O.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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ts. Near the sum-mit of the ridge extending along the White River canyon on the north,the West or Little Bonanza attains a maximum observed width of 10feet 6 inches, but the greater part of tlie vein to the northwest showsa width somewhat less, perhaps an average of 4 to 5 feet. The Big orEast Bonanza, in the crest of the ridge just mentioned, is but 7 feet 6inches wide, attaining its maximum observed width, 13 feet G inches, ina little hill about a mile north, just east of the road leading from Coy-ote Basin to Wagon Ax. Both Bonanzas cross this road, and are easilytraceable to another hill a mile northwest, where they again appear inprominent exposures. The East Bonanza is here about 8 feet wide, theWest still of workable thickness. Northwest from this hill their out-crop is clearly discernible for a distance of between 1 and 2 miles, thebroad swath of scant vegetation which everywhere marks the presenceof the veins being a conspicuous feature of the sceue. South of White wo i 0 idu
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ELDRIDQE.) THE VEINS. 935 Elver, Mr. McAndrews, of the Ouray Agency, states that lie has tracedboth Bonanza veins quite to the Colorado line, but that along this por-tion of their length they become much thinner. In Colorado the singlevein discovered is said to be on the trend of one or the other of theBonanzas, and may prove to be either its continuation or another veinoriginating in an independent crack belonging to the same system.The Colorado vein has a length of nearly 2 miles east of the interstateline, and has been prospected for this distance and at one or two pointsworked in a small way to a depth of 100 feet. It has a general widthof about 3 feet. The Cowboy is the largest of the three veins in the White Riverregion, a maximum width of 18 feet having been observed at the crestof the ridge a mile north of the river. In either direction from thispoint it thins considerably, but maintains a width of 10 to 12 feet for adistance of at least 2 or 3 miles. Northward its presence is

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