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. 1916 Excerpt: ... that of the shaft itself. Swells and pinches occur frequently, and stringers of ore occasionally branch off from the main body. There is much resemblance in the shape of the deposit to the form assumed by some of the magnetites in the harder crystalline rocks of the Adirondacks. A second lens of ore shows at the ...
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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. 1916 Excerpt: ... that of the shaft itself. Swells and pinches occur frequently, and stringers of ore occasionally branch off from the main body. There is much resemblance in the shape of the deposit to the form assumed by some of the magnetites in the harder crystalline rocks of the Adirondacks. A second lens of ore shows at the surface to the west of the shaft in the hanging wall and is tapped underground by cross cuts from the main levels. This body is smaller, about 4 feet thick at the surface and 150 feet wide in the drift at the 200 foot level. The ore is intersected by small slips or faults. One fault is seen on the second level at the south end where it is accompanied by a sheeted zone of limestone that apparently terminates the ore; it lies near the edge of the limestone and is concealed at the surface by the alluvial beds that floor the adjacent valley. Evidences of faulting are found on the surface northeast of the shaft in the occurrence of a fracture zone which cuts across the bedding of the limestones; the zone is 3 feet or more wide. About 800 feet northeast of the working shaft, on the opposite side of the limestone ridge, an outcropping lens of ore has been prospected at the surface and for some distance underground, but has not been actively worked. The sulphides here occur in bunches, bands and as disseminations, intermixed with secondary silicates and limestone. The shape of the deposit is like a thick lens or shoot, but is less well defined than the bodies previously described. There is evidence of crushing and differential movement within the ore, which may be partially accounted for perhaps by the greater amount of silicates that have undergone hydration and swelling. The ore shades away at the edges into the country limestone. The ore from the proper...
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Add this copy of The Mining and Quarry Industry of New York State for... to cart. $44.02, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2012 by Nabu Press.
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