Bulletin Volume 33 (Paperback)

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. 1918 Excerpt: ... apart. The lower one has been partially explored by an 18-foot shaft. Its length is exposed at least 20 feet; it strikes N. 50 E., and dips 50 SE. The upper or main vein has been opened to a depth of 65 feet by a 23-foot vertical shaft and below that by an incline along the dip. At the bottom of the vertical shaft a level extends 54 feet southwest and 36 feet northeast. Surface prospecting by shallow pits and small cross-cuts is said to have shown that the ore body continues intermittently about 400 yards along the strike, but these pits are partially filled and there is a distinct absence of continuous gossan outcrops. The hornblendicchloritic walls exposed at the mouth of the upper vein strike N. 50 E, and dip 60 SE. Pratt' records the dip of the vein as 75-80 SE. The genetic relation of these two veins, the upper and the lower, is not really known. It has been suggested'1 "that the two outcrops are one and the same vein, folding and re-duplicating on itself." It does not seem at all improbable, however, that the smaller one is merely a split or partially isolated portion of the main body. The thickness of the main vein ranges from 3 to 7 feet. Douglas, in his report on the property, states that the width in the 23-foot level, northeast drift, is 6V2 feet, southwest drift 5 feet, and in the bottom of the incline, "the deposit is formed in well-defined and tight walls and the mineral is concentrated in a good mass and paying quantity. The width of the lode in the southwest corner of this bottom is 7 feet and in the northeast corner it is only 3 feet." Gossan and other oxidized materials extend from the surface to a depth of about 20 feet, below which the fresher sulphide ore is encountered. The upper part of the vein contains many dark...