Mineral Deposits of the Cerbat Range, Black Mountains, and Grand Wash Cliffs, Mohave County, Arizona

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U.S. Government Printing Office, 1909 - Mines and mineral resources - 226 pages
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Page 91 - ... number at the same time gives an approximate statement of the elevation. It is assumed that engineers and others finding these bench marks so stamped in the field will communicate with the Director of the United States...
Page 89 - Shawneetown, 111. of the United States Geological Survey. All results of spirit leveling in this State previously published by the US Geological Survey, and all later work are included in this report, rearranged by quadrangles.
Page 90 - They have been subjected to change resulting from the adjustments necessary to close circuits and to those resulting from reduction to mean sea level through readjustment of the precise-level net of the United States.
Page 190 - Big Blue or top of zone B in the Eastside field, and of the top of zone B in the Westside field. The contour interval is 100 feet. By means of this map the direction and amount of dip of the strata in the oil-bearing formation may be calculated for any point in the field, and the depth to the various productive sands or zones may be approximated for most parts of the territory.
Page 60 - Echart, east bank of Pond Fork of Coal River, opposite mouth of Skin Fork: copper bolt in ledge of rock, marked "USGS 1423 Ft. BM...
Page 90 - The former are determined by lines of levels run either in both forward and backward directions or by simultaneous double-rodded lines, a highgrade instrument being used and special precautions being taken in observations and reduction to correct errors and make the line continuously good throughout. The latter or primary levels are determined with the Y level, precautions being taken against only the principal errors and the levels being run mostly in circuits of single lines. The allowable limit...
Page 215 - The district trends north and south; it has a length of about 5 miles and a width of about 2^ miles. It is hilly on the south but open on the north, merging with the Sacramento Valley, which receives its drainage. Water is scarce, but some is encountered in the mines. The principal mines are the Mocking Bird, Hall, Great West, and Pocahontas. The Mocking Bird and Hall are now producing.
Page 68 - 592 ADJ 1903" 591.944 Glenwood, 5.9 miles south of, west of road, in face of rocky cliff; aluminum tablet stamped "587 ADJ 1903
Page 44 - School, in rock; aluminum tablet stamped "656" 655.797 Ireland, 3.1 miles southwest of, 50 feet west of Pocatalico River, 0.2 mile north of Emma Bell schoolhouse, east of road, in sandstone outcrop; aluminum tablet stamped "646...
Page 54 - ... 621" 620.10 Dry Branch, 0.7 mile northwest of postoffice, north of railroad and river, 40 feet east of trail over point, in sandstone cliff; aluminum tablet stamped "621" 620.573 Dry Branch, 1.5 miles southeast of. at south end of cut, east of railroad, 0.1 mile north of coal tipple, on top of outcrop of rock, chiseled square; painted "658...

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