Results 21 to 30 of about 292 (182)
Parameters for the formation of orogenic gold deposits [PDF]
Applied Earth Science, 2019 Orogenic gold deposits are the main source of gold for humanity. These deposits formed from the Archaean to Phanerozoic at crustal depths of more than 4 km.
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JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2017 Recently, in Indonesia gold exploration activities are not only focused along volcanic-magmatic belts, but also starting to shift along metamorphic and sedimentary terrains.
Hasria Hasria +2 more
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Ore Geology Reviews, 2021 Abstract The Pangjiahe deposit is an orogenic gold deposit located on the northwestern margin of the Fengtai Basin and has proven reserves of 38 t Au at an average grade of 6.3 g/t. Phyllite is widely distributed in the mining area with Triassic granite porphyry and diabase dykes intruded in faults crosscutting it.
Jian Ma +8 more
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Journal of Economic Geology, 2021 Introduction Gold deposits formed during mountain-building processes in Phanerozoic terranes that formed in metamorphic environment have a great dispensation in the world (Goldfarb et al., 2001).
Monire Sakhdari +4 more
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Indonesian Journal on Geoscience, 2014 DOI: 10.17014/ijog.v6i1.114In 2008, placer gold was discovered in Langkowala area (Bombana Regency), Southeast Sulawesi, Indonesia, and more than 60,000 traditional gold miners in the early 2009 have been operating by digging vertical pits and panning ...
Arifudin Idrus +3 more
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Mesozoic orogenic gold deposits in Mexico
Ore Geology Reviews, 2017 Abstract Although orogenic gold deposits in Mexico were mostly formed during the Cenozoic, they started forming during the Late Cretaceous, or perhaps even earlier. Mylonitic zones in the Oaxacan metamorphic complex span either Permo-Triassic or Triassic-Jurassic ages, but none of these have been formally associated with the existing orogenic gold ...
Aldo Izaguirre +2 more
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Geochemical and boron isotopic compositions of tourmalines from selected gold-mineralised and barren rocks in SW Finland [PDF]
Bulletin of the Geological Society of Finland, 2010 Tourmaline-bearing rocks and a number of gold occurrences coexist in southwestern Finland, in a region where extensive magmatism and hydrothermal systems occurred during the Svecofennian orogeny, 1.9-1.8 Ga ago.
M. Talikka, S. Vuori
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地质科技通报, 2023 The Weiningbeishan area in the eastern section of the North Qilian orogenic belt is one of the areas with the best metallogenic conditions and the most metallogenic signs of gold polymetallic deposits in Ningxia.
Lianfu Hai +7 more
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TOURMALINE FROM LATE QUARTZ VEINS OF THE MURTYKTY GOLD DEPOSIT, REPUBLIC OF BASHKORTOSTAN [PDF]
Минералогия, 2020 Tourmaline, an intermediate member of the oxyschorl–oxydravite–oxymagnesio-foitite-bosiite series with a predominance of the oxy-dravite-bosiite end-member, was studied from late calcitequartz veins in the eastern zone of the Murtykty gold deposit ...
M.A. Rassomakhin +3 more
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Controls on the Distribution of Invisible and Visible Gold in the Orogenic Gold Deposits of the Yangshan Gold Belt, West Qinling Orogen, China [PDF]
Minerals, 2019 Six orogenic gold deposits constitute the Yangshan gold belt in the West Qinling Orogen. Gold is mostly invisible in solid solution or in the sulfide lattice, with minor visible gold associated with stibnite and in quartz-calcite veins. Detailed textural and trace-element analysis of sulfides in terms of a newly-erected paragenetic sequence for these ...
Nan Li, Jun Deng, David Groves, Ri Han
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