The Iditarod-Ruby Region, Alaska |
Common terms and phrases
30 feet Alaska appears arsenopyrite average Beaver Creek sand bedrock beds biotite blue calcite Canyon carbonate cent chalcocite chalcopyrite Chattanooga shale chiefly clay coarse contains copper country rock crystalline crystals deposits depth dikes diorite district drilled east Edisto feet deep feet thick feldspar field formation galena Geology gneiss gold grains granite gravels gray Gulch gypsum hard ilmenite inches inclosing Innoko irregular Lime limestone marl mass mica mica gneiss miles Mineral Resources U. S. mining Mountains Nenzel Nenzel Hill northeast occurs open cut outcrop Owens Lake pegmatite phosphate pirssonite places probably production prospect pyrite quadrangle quartz range region reported Rept rhyolite ridge River rutile saline sample sandstone schist sea level Searles Lake sedimentary shaft shale silver Slate slope soft specimens sphalerite stopes streams surface tunnel U. S. Geol Valley vein Wayne County zone
Popular passages
Page 415 - 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 ADAMS, GI, and others.
Page 44 - ... of a fireproof building for the library, remains as urgent as before. The conflagration which destroyed a large part of the City of Chelsea, last spring, shows that the best protection from such a disaster is a large open space. The grounds of the Botanic Garden and Observatory form such a space, a quarter of a mile long, and an eighth of a mile wide. Many small fires occur in the district northwest of the Observatory, which, with a strong wind like that which prevailed during the Chelsea fire,...
Page 423 - The chief commercial granites of Massachusetts, New Hampshire, and Rhode Island: Bull.
Page 39 - The smelter is 6l/2 miles from Tooele Junction on the main line of the San Pedro, Los Angeles & Salt Lake railroad, where connection is made with the Tooele Valley railroad, and plants and yards cover onehalf square mile. Crushing and sampling 5-story building, 2 complete sections using the Brunton >yst«r of sampling, contains 8 Blake type crushers, 9 to irx!5 to 24" in size and 8 rolls, 12 to 15...
Page 415 - 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 ix - ... importance to warrant a more extended description; (2) preliminary reports on economic investigations the results of which are to be published later in more detailed form. These papers are such only as have a direct economic bearing, all topics of purely scientific interest being excluded. They have been grouped according to...
Page 424 - The geology of the road-building stones of Massachusetts, with some consideration of similar materials from other parts of the United States.
Page 68 - Orthoclase and microcline are the most common varieties of feldspar found in pegmatite. In many places, however, a variety of plagioclase, either albite or oligoclase, makes up part or all of the feldspar component.
Page 57 - The Cashin Mine, Montrose County, Colo.," US Geol. Survey Bull. 285, pp. 125-128, 1906. Gale, HS, " Geology of the Copper Deposits near Montpelier, Bear Lake County, Idaho,
Page 437 - The gold and silver veins of Silver City, De Lamar, and other mining districts in Idaho.