Global ETD Search

71	Geology and copper mineralization of the Coopers Hill District, Portland Parish, Jamaica, West Indies Lessman, James Lamont January 1979 (has links) No description available. Geology -- Jamaica. Geology, Stratigraphic -- Cretaceous. Copper ores -- Jamaica.
72	Tactite alteration and its late stage replacement in the southern half of the Rosemont mining district, Arizona McNew, Gregory E. January 1981 (has links) No description available. Tactite. Metasomatism (Mineralogy)
73	Geological-geochemical relationships between prophyry copper and porphyry molybdenum ore deposits Lainé, R. (Roger), 1946- January 1974 (has links) No description available. Porphyry -- Arizona. Copper ores -- Arizona. Molybdenum ores -- Arizona.
74	The distribution and zoning of the radioelements potassium, uranium, and thorium in selected porphyry copper deposits Davis, Jerry Dean, 1944- January 1971 (has links) No description available. Potassium. Uranium. Thorium. Porphyry. Gamma ray spectrometry. Copper ores -- Arizona.
75	Fluid inclusion study of the porphyry copper prospect at Red Mountain, Arizona Bodnar, Robert John, 1949- January 1978 (has links) No description available. Mineralogy -- Arizona -- Red Mountain. Copper ores -- Arizona -- Red Mountain.
76	Geology, alteration, and mineralization of the El Alacran area, northern Sonora, Mexico Dean, Darrel Allen, 1943- January 1975 (has links) El Alacran, northern Sonora, Mexico, is a high-level, Laramide porphyry copper deposit encompassing an east-west elongated altered and mineralized area of 2.7 by 6 km. A small quartz latite porphyry plug forcefully intrudes comagmatic(?) Late Cretaceous or Early Tertiary andesitic to quartz latite volcaniclastic rocks.Veinlet-controlled and pervasive potassic, Type I phyllic, and transition type alteration with related base-metal mineralization postdates pervasive propylitic alteration and is related in space and time to the intrusive and its associated intrusion-breccia annulus. Potassic alteration is dated by K-Ar at 55.4 +- 1.2 m.y. Later pervasive and veinlet-controlled Type II phyllic and minor advanced argillic alteration is associated with intrusive breccia dikes and pipes which are genetically related to degassing of the system. Minor veinlet-controlled late-stage alteration followed. Hypogene zoning is exhibited by alteration, mineralization, total sulfide volume, mineralized fracture density, and geochemistry with zoning being centered over or to the east of the exposed intrusive. Supergene enrichment processes have modified hypogene sulfides, oxides, and silicates and have formed a copper enriched blanket which underlies a leached cap. The blanket is characterized by a chalcocite zone which grades downward into a bornite-digenite-covellite zone and then into low-grade protore. Although the enriched blanket appears to be subeconomic, this study indicates potential for a deep, high-grade protore zone. Geology -- Mexico -- Sonora (State) Copper ores -- Mexico -- Sonora (State)
77	Oxidation-leaching, and enrichment zones of a porphyry copper deposit: a mineralogic and quantitative chemical study Koenig, Brian A. January 1978 (has links) No description available. Mineralogy -- Arizona -- Pima County. Copper ores -- Arizona -- Pima County.
78	The geology of the Esperanza Mine and vicinity, Pima County, Arizona Lynch, Dean W. January 1967 (has links) No description available. Geology -- Arizona -- Pima County. Copper ores -- Arizona -- Pima County.
79	Geology, alteration, and mineralization of the Copper Basin porphyry copper deposit, Yavapai County, Arizona Christman, Jerry Lynn, 1947- January 1978 (has links) No description available. Copper ores -- Arizona -- Copper Basin. Mineralogy -- Arizona -- Copper Basin.
80	The Geology and hydrothermal alteration of the Independence porphyry deposit, British Columbia. Morton, R. L. (Ronald Lee) January 1970 (has links) No description available. Copper ores -- British Columbia. Porphyry Geology -- British Columbia.

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