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abundant altered amount appears associated beds biotite bodies brick building Bulletin Canyon carried cement cent City clay coarse color Company considerable consists contains copper County covered Creek crystals deposits depth dikes direction district east extending fault feet feldspar formation Geology gold grains granite gravel gray Gulch Hill important inches intrusive iron known less limestone locally located lower magnetite masses massive material mica miles minerals mining Mountain nearly northwest occur oolitic opened operated original outcrop oxide phosphate places porphyry portion present probably prospects pyrite quarry quartz range region reported Resources River rock rutile sand sandstone schist sericite shaft shale shows side slate slope solutions stone strike structure surface Survey thick tion United upper valley varying veins western wide zone
Page 400 - The government publications, except those to which a price is affixed, can be obtained free by applying to the Director...
Page 178 - The constant occurrence of the chromite in rounded masses of varying proportions near the contact of the peridotite with the gneiss and its occurrence in the fresh, as well as the altered, peridotite indicate that the chromite has been held in solution in the molten mass of the peridotite when it was intruded into the country rock, and that it separated out among the first minerals as this mass began to cool.
Page 602 - ... veins." In the very large pegmatites the mica is not in general evenly distributed through the mass, but is richer in one portion than another, so that the entire bulk of the rock does not have to be removed in mining.
Page 270 - HARDER, EC Manganese deposits of the United States; with sections on foreign deposits, chemistry, and uses.
Page 398 - ... 90 per cent less than 2.1 millimeters. No particle shall be more than 5 millimeters in diameter, and the sand shall be passed through screens or sieves of such mesh as to stop all such particles, and no screen or sieve shall be used containing at any point holes or passages allowing grains larger than the above to pass. The diameters of the sand grains will be computed as the diameters of spheres of equal volumes.
Page 455 - Geological Survey, Washington, DC The priced publications may be purchased from the Superintendent of Documents, Government Printing Office, Washington, DC Those marked "Exhausted" are not available for distribution, but may be seen at the larger libraries of the country.
Page 269 - 24. List of Marine Mollusca, comprising the Quaternary fossils and recent forms from American Localities between Cape Hatteras and Cape Roque.
Page 379 - 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...
Page 419 - Geology and water resources of the northern portion of the Black Hills and adjoining regions in South Dakota and Wyoming. Professional Paper 65. 106pp. 1909. DARTON, NH, and SIEBENTHAL, CE Geology and mineral resources of the Laramie Basin, Wyoming; a preliminary report.