Results 51 to 60 of about 91 (71)

Jasperoid as a Guide to Mineralization in the Taylor Mining District and Vicinity near Ely, Nevada

Economic Geology, 1974
Samples of mineralized jasperoid from the central part of the Taylor silver mining district, near Ely, Nevada, and of unmineralized jasperoid from outlying bodies exhibit characteristics that seem to be useful as guides to the center of mineralization and also to clarify the genesis of the ore deposits.
T. G. Lovering, A. V. Heyl
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EPR spectra and lithogeochemistry of jasperoids at Carlin, Nevada: distinction between auriferous and barren rocks

Journal of Geochemical Exploration, 1995
Abstract The acid insoluble residue of twenty-nine gold-bearing and ten barren jasperoids from Carlin, Nevada, were analysed by electron paramagnetic resonance powder spectroscopy (EPR), and by simultaneous proton-induced X-ray emission (PIXE) and proton-induced gamma ray emission (PIGME) spectroscopy.
J.C. van Moort, M.A.C. Hotchkis, Aung Pwa   +2 more
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Radiological implication of the granitoid rocks and their associated jasperoid veins, El-Missikat area, Central Eastern Desert, Egypt

International Journal of Environmental Analytical Chemistry, 2020
Older and younger granites mainly represent gable El-Missikat in addition to red and black jasperoid veins.
Hamdy A.M. Awad, Hesham M.H. Zakaly, Aleksey V. Nastavkin, Atef El-Taher   +3 more
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Fe-oxides in jasperoids from two gold districts in Nevada: Characterization, geochemistry, and (U-Th)/He dating

Geochimica et Cosmochimica Acta, 2020
Abstract This study examines the whole-rock geochemistry, Fe-oxide texture and crystal morphology, and Fe-oxide (U-Th)/He date variation of jasperoids, as well as the relationships between these characteristics, in order to evaluate jasperoids as an indicator for gold mineralization.
Dante E. Huff, Elizabeth Holley, William R. Guenthner, Jenna M. Kaempfer   +3 more
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Geology and mineralogy of East Kazakhstan gold-bearing jasperoids (by the example of the Baybura ore field)

Russian Geology and Geophysics, 2013
Abstract Gold-bearing ore occurrences and deposits in jasperoids are objects of a new unconventional type widespread in the West Kalba auriferous belt in eastern Kazakhstan. We present original data on the structural and geologic position and mineralogy of gold-bearing jasperoids of the Baybura ore field, which is a standard object of ...
O.N. Kuz’mina, B.A. D’yachkov, A.G. Vladimirov, M.V. Kirillov, Yu.O. Redin   +4 more
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Geology, mineralogy, geochemistry, and geothermometry of Kelley Limestone jasperoids, Magdalena mining district, New Mexico

1995
Jasperoid, a microcrystalline silica rock, occurs along the crest of the Magdalena Mountains and along the west-facing dip slope. It is the focus of this study because in similar settings in Nevada it is associated with economically important deposits of very fine grained gold.
Jacques Renault, Augustus K. Armstrong, John E. Repetski, Robert L. Oscarson   +3 more
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Comparative elemental and oxygen isotope geochemistry of jasperoid in the northern Great Basin; evidence for distinctive fluid evolution in gold-producing hydrothermal systems; reply

Economic Geology, 1988
This comparative geochemical study of jasperoid in the northern Great Basin is based on 65 samples from 10 Carlin-type gold deposits and 22 similar but apparently barren hydrothermal systems. Multielement geochemistry coupled with oxygen isotope data indicate that hydrothermal fluids in barren and mineralized systems evolved in different ways, and that
Peter T. Holland, David W. Beaty, Geoffrey G. Snow   +2 more
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Comparative geochemistry of jasperoids from Carlin-type gold deposits of the western United States

Journal of Geochemical Exploration, 1990
Abstract Exploration for Carlin-type gold orebodies in the western United States typically involves sampling and analysis of jasperoid, a distinctive alteration type formed by intense silicification of marine sediments. In this study, rock suites were collected from six orebodies and four similar but barren systems.
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Radiological implication of the granitoid rocks and their associated jasperoid veins, El-Missikat area, Central Eastern Desert, Egypt

International Journal of Environmental Analytical Chemistry, 2022
Hesham M H Zakaly, Atef El-Taher
exaly  

Gold-bearing jasperoid in the Drum Mountains, Juab and Millard Counties, Utah

Circular, 1969
Joseph Howard McCarthy, R.E. Learned, J.M. Botbol, T.G. Lovering, J.R. Watterson, R.L. Turner   +5 more
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