Contributions to Economic Geology of AlaskaCorrelation of the physical properties and mineralogy of some unconsolidated sediments and use of the data in interpretative petrology. |
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adjacent Alaska basalt bedrock bluff body calcite Calico Creek carbonaceous Chalet Mountain Chitina Chitina Valley coal bed coal-bearing concentrate conglomerate consists contain copper Cretaceous cross fault Devonian dikes DMEA drift east examined exposed feet thick feldspar fine-grained fractures gabbro glass grains granite graywacke inches interbedded investigation Kaltag Kobuk River Kodiak limestone locality malachite Margaret Creek Matzko Mertie milepost miles Mines Mount Fairplay NORTH MAGNETIC NORTH Nulato obsidian olivine outcrops pentlandite percent equivalent uranium perlite perlite deposit phenocrysts pipe plagioclase Polychrome Pass prospect prospectors pyrite pyrrhotite quartz radioactivity anomalies radiometric rhyolite River area Ruby sandstone sanidine scheelite schist shale Stampede fault stibnite Strike and dip structure Sugar Mountain sulfide minerals Survey Bull talus Tanana River Taylor Highway Tertiary age thin section Trace traverse TRUE NORTH MAGNETIC tuff U.S. Bureau U.S. Geol U.S. Geological Survey underlain upper upstream uranium vein volcanic rocks Wahrhaftig Yukon River zone
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Page 75 - This study is part of a program conducted by the US Geological Survey on behalf of the Division of Raw Materials of the US Atomic Energy Commission.
Page 72 - The fissures are such as can produce plates of ice varying " from a small fraction of an inch to several inches in thickness...
Page 86 - Bull. 675, 82 p. — — —1927, The Iniskin-Chinitna Peninsula and the Snug Harbor district, Alaska: US Geol. Survey Bull. 789, 71 p.
Page 13 - It is commonly finely granular. Polished sections of the ore indicate an average grain size of about 0.01 millimeter in thickness and about 0.02 millimeter in the other two directions. Most of the crystals are oriented with the long dimensions parallel to the vein walls. A late generation of needlelike stibnite crystals cementing brecciated early stibnite is quantitively insignificant. The needlelike crystals are commonly several millimeters long
Page 12 - Tunnel level consists largely of vein quartz and brecciated schist containing 10 percent or less of antimony. Six feet down in the Nesse winze, stibnite is a prominent constituent of the vein. The winze has been sunk to 20 feet below the level, where the vein consists of 1 foot of almost pure stibnite
Page 86 - Thermal data and energy required for expansion: US Bur. Mines Rept. Inv. 4394, 15 p.
Page 20 - Nulato formation: Marine sandstone and shale. Contains marine invertebrates and a few plants. 3,000?
Page 50 - ... Railroad (No. 44) , and at Miller's Landing near Homer (No. 11), most of the material was found to have poor to only fair bloating properties, and therefore probably not amenable to the production of lightweight aggregate. Perlite is a glassy volcanic rock that, when heated rapidly to about 1700° F, suddenly expands to a cellular glass that is similar to natural pumice. Perlite deposits have been found at Sugar Mountain near Healy (No. 10), and at Polychrome Pass and Calico Creek in McKinley...
Page 13 - ... is a definite vein, with 1 to 7 feet of medium- and high-grade ore on the Upper Tunnel and 50 foot (sub) levels,
Page 62 - ... sedimentary Interbeds in the Mundubbera Sheet area (Wass, 1962) and Lower Permian marine fossils in Interbedded limestone in the Monto Sheet area (Dear, pers. comm.), and can be correlated with the Lower Permian Lower Bowen Volcanics farther to the north on age, stratigraphic position, and lithology. The thickness of the unit is not known, as the base is nowhere exposed. Rannes Beds The name 'Rannes Altered Rocks...