File:Transactions (1871) (14596783378).jpg

Identifier: transactionsmining31amer (find matches)
Title: Transactions
Year: 1871 (1870s)
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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cene gravels, cov-ered with sage-brush, excepting a narrow, dry wTash, whichforms its lowest part and lies a little W. of the center. Thiswash can be traced by the eye as running southward, like a dryriver, to the playa in which it ends—a brilliant white mud-lakealmost entirely enclosed by dark hills of volcanic rock. Anidea of the depth of the Pleistocene gravel is given by the factthat, 7 miles out from the foot-hills and more than 1200 ft.below the Delamar mill, a w^ell gunk to the depth of 900 ft. wasapparently all the way in this gravel, and as dry at the bottoma- at the top. General Geology. The general form of the mountain slopes, on which the Dela-mar mine is situated, is shown in the accompanying sketch(Fig. 3), in which the relative position of the different raviiand mine-works is taken from a local survey by Mr. F. A. 664 Till: DELAMAR AND THE 1I0RN-SILVEK MINES. Swindler, the presenl mine-manager, and the topographic formsare roughly sketched in from memory. s? B <s I
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31 The geological structure of this region is extremely simple.The mountain slopes at the mine are made up of a heavy series in i: Ill \m \i; \m» ill 1: BORN-SILVBB MINI «»t quartzite beds, striking N. 80 to l«> B. and dipping 288E., which are traversed by a t«■ \\ narrow dikes of porphyry.N-> oilier beds than quartzite are Been in the immediate vicin-ity; 1 hit they are said t be overlain, on the lull- to tipward, by Limestone Btrata. The more eastern portion of tin-Meadow Valley range, opposite here, while Largely made up oferuptive rocks, shows a few outcrops of quartzite. Along the western slopes, as the beds are followed north-ward, tli*- strike apparently Buffers a gradual change t<» the X.and then to the W. otX.. the dip -till continuing to the K. Alittle more than a mile X. of Delamar, a broader and deeperravine, in which the now extinct mining camp of Selene was situated, is apparently the loCUS of an K.-YV. fault, with a enn- siderable downthrow to t

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