Results 121 to 130 of about 1,709 (175)

Geochemistry of mineralizing fluids in the Bralorne-Pioneer Mesothermal gold vein deposit, British Columbia, Canada

Economic Geology, 1991
Gold quartz veins at the Bralorne mesothermal vein deposit have extensive quartz-ankeritic carbonate-muscovite hydrothermal alteration envelopes that grade outward to chlorite-calcite-albite. Minor pyrite with traces of sphalerite, galena, and tetrahedrite are found in the veins with native gold; more abundant pyrite and arsenopyrite, with lesser ...
C H B Leitch, Colin I. Godwin, Thomas H. Brown, B. E. Taylor   +3 more
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A multidisciplinary study of invisible gold in arsenopyrite from four mesothermal gold deposits in Siberia, Russian Federation

Economic Geology, 1998
Characterization of gold in four Siberian mesothermal gold deposits was done through a multidisciplinary investigation (including ore microscopy, INAA, SIMS, EPMA, and 197 Au Moessbauer spectroscopy). The deposits are Olympiada and Veduga in the Enisei Mountain Range and Nezhdaninskoye and Sentachan in the Verkhoyansk-Kolyma area, in which vein and ...
Alexander D. Genkin, Nikolai S. Bortnikov, Louis J. Cabri, F. E. Wagner, Chris J. Stanley, Yurii G. Safonov, Greg McMahon, J. Friedl, Alexei L. Kerzin, Gennady N. Gamyanin   +9 more
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Age constraints of the Wassa and Benso mesothermal gold deposits, Ashanti Belt, Ghana, West Africa

Journal of African Earth Sciences, 2015
Abstract The Ashanti Belt in Ghana hosts numerous multi-million ounce gold deposits and is one of the most richly gold endowed Paleoproterozoic belts of the West African Craton. This work shows that the Wassa mineralized intrusion is part of the Sefwi Group.
Luis A. Parra‐Avila, Yan Bourassa, John Miller, Stéphane Perrouty, Marco L. Fiorentini, T. Campbell McCuaig   +5 more
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Deposition conditions and distribution features of native gold individuals in the veins of the Tokur mesothermal deposit, Russia

Geology of Ore Deposits, 2016
The paper discusses factors in the deposition and concentration of native gold and the spatial distribution of its individuals within the sufide-poor gold–quartz veins at the mesoabyssal Tokur deposit. The major factors in deposition of gold were sealing of the hydrothermal system, a sudden drop in fluid pressure, and repeated immiscibility in the ...
N. S. Ostapenko, O. N. Neroda
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Pb isotope fingerprinting of mesothermal gold deposits from central Victoria, Australia: implications for ore genesis

Mineralium Deposita, 1998
New Pb isotope data from three major mesothermal lode gold deposits (Ballarat West, Tarnagulla, Maldon) in central Victoria support a model whereby the metals derived from a large reservoir with a long residence time in the crust below the Palaeozoic Lachlan Fold Belt.
F. P. Bierlein, N. J. McNaughton
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Nitrogen isotope systematics of mesothermal lode gold deposits: Metamorphic, granitic, meteoric water, or mantle origin?

Geology, 1999
Archean gold-bearing quartz vein systems constitute one of the most important classes of precious metal deposits; however, their origin remains controversial. Mantle, granitoid, meteoric water, and metamorphic related models do not resolve this controversy.
Yiefei Jia, Robert Kerrich
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Geochemical controls on the environmental mobility of Sb and As at mesothermal antimony and gold deposits

Applied Earth Science, 2004
AbstractAntimony and arsenic are commonly mobilised into the environment from mesothermal mineral deposits. Both these metalloids are potentially toxic in the environment when dissolved in water at low levels (
D. Craw, N. Wilson, P.M. Ashley
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The scale of ore-depositional systems: an important restraint on epigenetic vs remobilized syngenetic origins for Archaean mesothermal gold deposits

Geologische Rundschau, 1990
There is general consensus that the majority of gold deposits in the important group hosted by volcanic or intrusive host rocks within Archaean granitoid-greenstone terrains have an epigenetic origin. However, there is controversy surrounding those stratabound deposits hosted by Fe-rich sedimentary rocks, such as banded iron formation (BIF), for which ...
Vearncombe, Julian R., Groves, David I.
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The geology and alteration patterns of a disseminated, shear zone-hosted mesothermal gold deposit; the Francoeur 3 Deposit, Rouyn-Noranda, Quebec

Economic Geology, 1993
The Francoeur 3 gold deposit, located approximately 15 km southwest of Rouyn-Noranda, Quebec, is one of several geologically similar Archean mesothermal gold deposits occurring along the Francoeur-Wasa shear zone, a second-order reverse structure possibly related to the Cadillac-Larder Lake break.The principal gold mineralization, which is completely ...
J. F. Couture, P. Pilote
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Re–Os geochronological constraints on the Dabolava mesothermal gold occurence, Madagascar: Implications for the Ikalamavony sub-domain deposition age

Journal of African Earth Sciences, 2014
Abstract New Re–Os ages for early concordant veins and later discordant veins in the Ikalamovony sub-domain of west-central Madagascar require respectively a Paleoproterozoic age for metasedimentary rocks and a Pan-African age for the orogenic type occurrences. Indeed, this paper focuses on Re–Os geochronology of Dabolava gold occurrences, located in
Andre-Mayer, A. S., Ramiandrisoa, N., Vanderhaeghe, O., Reisberg, L., Rabeandrasana, S., Zimmermann, C.   +5 more
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