نتایج جستجو برای: primary gold mineralization
تعداد نتایج: 732825 فیلتر نتایج به سال:
Highly cracked and isomerized archaeal lipids and bacterial lipids, structurally changed by thermal stress, are present in solvent extracts of 2,707- to 2,685-million-year-old (Ma) metasedimentary rocks from Timmins, ON, Canada. These lipids appear in conventional gas chromatograms as unresolved complex mixtures and include cyclic and acyclic biphytanes, C36-C39 derivatives of the biphytanes, a...
Mountainous landscapes in Central Zagros are mainly used as grazing rangelands to feed animals and are heavily degraded. Overgrazing may impose a negative effect on rangeland productivity and sustainability through significant changes in soil properties. Soil nitrogen (N) mineralization is one of the key biological processes that might be affected by biotic and abiotic factors including range g...
introduction more than 30 fluorite occurrences with approximately 1.35 million tons of reserves have been recognized in iran (ghorbani, 2013). the atashkuh fluorite-barite (±sulfide) deposit is one of four occurrences located south of the city of delijan in markazi province, about 80 km se of arak city. the atashkuh deposit occurs between the central iran structural zone on the north and the sa...

 The article describes Reza gold deposit of Ugur exploration area located in Geda- bek Ore District the Lesser Caucasus NW Azerbaijan. It is established that main mineralization consists hematite-barite-quartz-kaoline veins- veinlets and breccia, pyrite stock-stockverk quartz-sulfide veins. On orebody surface center secondary quartzites with vein-veinlets barite-hematite have occured over...
Abstract In recent years, various geological activities and different mineral prospecting exploration programs have been intensified along the Red Sea hills in order to elucidate maps evaluate potentials. This study is therefore aimed at testing viability of using remote sensing geographic information system (GIS) techniques for mapping gold mineralization area. The area located northeast Sudan...
Typomorphic features of placer gold the Anabar region were studied as predictive-exploration criteria. The target study was to determine typomorphic related intermediate sources (paleo-placers) and supposed nearby primary ore occurrences. Two varieties identified. first variety is well-rounded high-fineness lamellar with a highly modified internal structure. This native associated sources, Neog...
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