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altered alunite andesite anglesite appears arsenopyrite basin beds biotite bodies bornite breccia Bull calcite canyon carbonate celestite cent chalcocite chalcopyrite clay consists contains copper country rock County Creek crystalline crystals deposits depth developed dikes diorite drift east exposed fault feet thick feldspar fissure fracture galena gangue Geological Survey Geology gold granite porphyry gravels Gulch igneous inches intrusive iron irregular lake limestone limonite magnesite manganese masses material meta-andesite miles Mineral Resources U. S. mining district Mountain northeast northwest occurs outcrop oxide peridotite phenocrysts places porphyry present probably production prospect pyrite quadrangle quartz quartzite range region Rept ridge River Rockwood salt sample sandstone sericite serpentine shaft shale shows siderite silver slate slope smithsonite southeast southwest sphalerite stopes strike sulphides surface Tennessee Trinity tunnel U. S. Geol upper Valley vein vertical vicinity zinc zone
Page 375 - Government publications, except those to which a price is affixed, can be obtained free by applying to the Director, United States Geological Survey, Washington, DC Applications for publications marked with an asterisk (*) should be addressed to the United States Bureau of Standards at Washington.
Page 361 - ... instead of absorbed, and the resultant effect upon the eye is that of whiteness. The darker color of a polished surface is due merely to the fact that through careful grinding all these irregularities and reflecting surfaces are removed, the light penetrating the stone is absorbed, and the effect upon the eye is that of a more or less complete absence of light or darkness. Obviously then the more transparent the feldspars and the greater the abundance of dark minerals, the greater will be the...
Page 137 - SCHRADER, FC, Mineral deposits of the Cerbat Range, Black Mountains, and Grand Wash Cliffs, Mohave County, Ariz.: Bull.
Page 343 - 24. List of Marine Mollusca, comprising the Quaternary fossils and recent forms from American Localities between Cape Hatteras and Cape Roque.
Page 344 - Manganese deposits of the United States, with sections on foreign deposits, chemistry, and uses: US Geol.
Page 281 - No. 260, 1905, pp. 321-334. . The Clinton or red ores of the Birmingham district, Alabama: Bull. US Geol. Survey No. 315, 1907, pp. 130-151. The brown iron ores of the Russellville district, Alabama: Bull.
Page 552 - The following publications, except those to which a price is affixed, can be obtained free by applying to the Director...
Page 136 - Preliminary account of Goldfield, Bullfrog, and other mining districts in southern Nevada, by FL Ransome, with notes on the Manhattan district, by GH Garrey and WH Emmons.
Page 361 - Merrill" explains the cause of these contrasts very satisfactorily : The impact of the hammer breaks up the granules on the immediate surface, so that the light falling upon it is reflected, instead of absorbed, and the resultant effect upon the eye is that of whiteness. The darker color of a...
Page 373 - These publications, except those to which a price is affixed, can be obtained free by applying to the Director, United States Geological Survey, Washington, DC The priced publications may be purchased from the Superintendent of Documents, Government Printing Office, Washington, DC...