Results 261 to 270 of about 305,177 (315)
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Geology and Reserves of Lead and Zinc Ores : A World Survey
Nature, 1949AT the eighteenth session of the International Geological Congress, held in London last summer, after being postponed from 1940, the proceedings of Section F were devoted to a consideration of the geology, paragenesis and reserves of the ores of lead and zinc. Up to the time of the Second World War, it had been assumed generally that resources of these
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Geology of the Ozark Lead Company Mine, Viburnum Trend, Southeast Missouri
Economic Geology, 1977In contrast to most of the other mines in the Viburnum Trend, much of the Ozark Lead Company orebody lies at right angles to the depositional strike of the sediments. This divergence is due to localization of much of the ore along the flank of a northwest-trending Precambrian high situated on the upthrown side of a high-angle reverse fault.A second ...
M. M. Mouat, C. W. Clendenin
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The geology of the Aguilar lead-zinc mine, Argentina
Economic Geology, 1950"The Aguilar deposit, in northern Argentina, is a hypothermal lead, zinc, silver replacement in Cambrian calcareous quartzite. The rocks had previously been altered to tactite by a granite stock whose contact is from 150 to 250 m. from the ore bodies.
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The geology of the Zawar lead-zinc mine; a reply
Economic Geology, 1968Reply is made to several critical discussions published since the publication of the original paper in 1964 (for reference, see this Bibliography Vol. 29, Mookherjee 1; see also Vol. 29, Mookherjee 2; Vol. 30, Poddar 2; Vol. 31, No. 4, 02 E67-02447; Vol. 32, No. 1, 02 E68-00608). The deposit is regarded as a product of ascending hydrothermal solutions.
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The geology of the Zawar lead-zinc mine, Rajasthan, India
Economic Geology, 1964The lead-zinc ores occur in a shear zone in Precambrian metasediments. The shear zone is later than the two recognized generations of folds, and contemporaneous with wall-rock alteration and subsequent mineralization. Flow directions of mineralizing solutions are deduced from the mineral zoning pattern; galena follows sphalerite paragenetically and ...
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The data of lead isotope geology related to problems of ore genesis
Economic Geology, 1961Searching questions about the origins of ore deposits have been asked for many years. Where do ore fluids originate - within the crust, or deeper? Can specific sources of ore metals be identified? When were ores deposited? How long did mineralization continue? What was the rate and paragenesis of deposition?
R. S. Cannon +3 more
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Geology of the zinc-lead deposit on Calumet Island, Quebec
Geological Society of America Bulletin, 1941The zinc-lead deposit described is located on Calumet Island, Quebec, 53 miles northwest of Ottawa. The complex ores resemble those of Edwards, New York, and Montauban, Quebec, and other Grenville deposits. They occur in moderately inclined Grenville metamorphic rocks, including crystalline limestone, amphibolite, amphibolite-gneisses, quartzitic ...
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Geology and structural features of vein-type lead and zinc deposits
Geology of Ore Deposits, 2007The geological and structural position and localization conditions of the vein-type Pb-Zn deposits of the Sadon (North Ossetia) and East Karamazar (North Tajikistan) ore districts are considered. The leading role of long-lived deep faults in the control of large deposits is emphasized. Examples of such deposits in different provinces are given.
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Geology and Geochemistry of Lead-Zinc Mineralization in Ameri, Southeastern Nigeria
British Journal of Earth Sciences ResearchThe Geology and geochemistry of Lead-Zinc Mineralization has been carried out in parts of Ameri, South eastern Nigeria. The study area was mapped and lithological units and structural features were identified and studied. A total of twenty-seven (27) samples from five (5) wells (AMR 014, AMR 036, AMR 038, AMR 048, and AMR 049) of the study area were ...
A.B. Segun, B. S. Jatau., I. Y. Tanko,
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Mining Geology of the Lead-Zinc Ore Mineralizations of Altınoluk, Çanakkale
Çanakkale Altınoluk Papazlık Pb-Zn mineralization is observed in amphibole-gneiss and marbles of Fındıklı Formation, generally concordant with the host rocks and in fault zones which intersect the host rocks. Ore minerals composed of galena, pyrite, chalcopyrite, sphalerite, phyrrothite, gold, hematite, rutil, ilmenite and other ores of replacement ...İLBARS, Yıldız +2 more
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