Download or read book Geology and Mineralization of the Seaman Gulch Area East Shasta Mining District Shasta County California written by Douglas W. Prihar and published by . This book was released on 1987 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Seaman Gulch area is located approximately 20 miles east of Redding, California and is part of the eastern Klamath lithotectonic belt. Rock units of the area are chiefly mafic and silicic volcanics of island arc affinity and shale that are Permian to Triassic in age. Volcanic rocks of Tertiary and Quaternary age unconformably overlie the pre-Tertiary rocks. All pre-Tertiary rocks have been altered by hydro-thermal and(or) metamorphic processes. Stratabound epigenetic mineralization is hosted by metadacitic pyroclastics of the Bully Hill Rhyolite. The hypogene sulfide minerals present are pyrite, sphalerite, chalcopyrite, tetrahedrite-tennantite and galena. Minor amounts of supergene chalcocite are found. These sulfides occur as disseminations, stringer veinlets, massive pods and an irregular network around pyroclastic fragments. Controls that localized the occurrences of sulfides are intrusive rock-country rock contacts, permeability and porosity of pyroclastic rocks, faults, and fractures. The gangue mineralogy of the stringer veinlets consists of quartz, carbonate, and anhydrite. The distribution of sulfide minerals is zoned vertically and from bottom to top as follows: pyrite - chalcopyrite as disseminations and stringer veinlets; pyrite - sphalerite - chalcopyrite as disseminations, stringer veinlets, and networks; and pyrite - sphalerite - chalcopyrite - tetrahedrite-tennantite - galena as disseminations, stringer veinlets, and massive pods. Hydrothermal alteration assemblages are chloritic alteration, quartz - white mica alteration, propylitic alteration, silicification, argillic alteration, and carbonate alteration. These alteration assemblages display both vertical and lateral zonations. A central zone of chloritic alteration grades laterally into propylitic alteration, and upward into quartz-white mica alteration. The quartz - white mica alteration in turn grades laterally into propylitic alteration. Argillic alteration and carbonate alteration are genetically related but slightly later events that overprint the earlier assemblages. The mineralization in the Seaman Gulch area is similar to the stockwork zone that underlies Kuroko-type volcano-genic massive sulfide deposits. The sulfides and their associated products of hydrothermal alteration were deposited during submarine geothermal activity that was operative during the latest Permian time. The economic potential of the Seaman Gulch area is considered to be low because of the paucity of base metalbearing sulfides, their occurrence as chiefly disseminations and veinlets, and the restricted distribution of economic assays.
Download or read book Economic Geology of the French Gulch Quadrangle Shasta and Trinity Counties California written by John Patrick Albers and published by . This book was released on 1965 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Oata Analysis and Synthesis (CINOAS) * at Purdue. University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 33 (thesis year 1988) a total of 13,273 theses titles from 23 Canadian and 1 85 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 33 reports theses submitted in 1988, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Download or read book Geology and Geochemistry of Mineralization and Alteration in the Central Portion of West Shasta Cu Zn District Shasta County California written by William Howard Casey and published by . This book was released on 1980 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1988 with total page 1152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book California Geology written by California. Division of Mines and Geology and published by . This book was released on 1990 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology and Ore Deposits of East Shasta Copper zinic District Shasta County California written by John P. Albers and published by . This book was released on 1961 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology and Base metal Deposits of West Shasta Copper zinc District Shasta County California written by Arthur Rudolph Kinkel and published by . This book was released on 1956 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mines and Mineral Resources of Shasta County California written by Philip A. Lydon and published by . This book was released on 1974 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology of the Massive Sulfide Deposits at Iron Mountain Shasta County California written by Arthur Rudolph Kinkel and published by . This book was released on 1951 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology and Ore Deposits of East Shasta Copper zinc District Shasta County California written by Geological Survey (U.S.) and published by . This book was released on 1956 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preliminary Report written by California. Division of Mines and Geology and published by . This book was released on 1922 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Geology and Ore Deposits of the Bully Hill Mining District California written by Albert Clarence Boyle and published by . This book was released on 1914 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology and Ore Deposits of the Afterthought Mine Shasta County California written by John Patrick Albers and published by . This book was released on 1953 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geology and Ore Deposits of East Shasta Copper zinc District Shasta County California written by John Patrick Albers and published by . This book was released on 1961 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book California Journal of Mines and Geology Quarterly Chapter of State Mineralogist s Report written by California. Division of Mines and Mining and published by . This book was released on 1888 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report for 1917/18 consists of three monographs by E. MacBoyle issued separately as Mines and mineral resources of Nevada County. Mines and mineral resources of Plumas County. Mines and mineral resources of Sierra County.
Download or read book Chapter of Report of the State Mineralogist Covering Mining in California and the Activities of the State Mining Bureau written by California State Mining Bureau and published by . This book was released on 1926 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
