Results 191 to 200 of about 58,548 (228)

Geology and geochronology of the Tokuzbay gold deposit in the Chinese Altai: A case study of collision-related orogenic gold deposits in Central Asian Orogenic Belt

Ore Geology Reviews, 2021
Abstract Orogenic gold deposits are one of the most important gold deposits in the world. However, it is controversial that orogenic gold deposits are only generated at subduction-accretion or both in collisional setting. The Altai Orogen experienced a complex subduction accretion–collision history, including magmatism and metamorphism, and forming ...
Abulimiti Aibai, Xiao‐Hua Deng, F. Pirajno, Shen Han, Wenxiang Liu, Xun Li, Xi Chen, Yanshuang Wu, Zhong-yi Bao, Yan‐jing Chen   +9 more
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Multivariate statistical analysis of trace element compositions of native gold from orogenic gold deposits: Implication for mineral exploration

, 2021
The mineralogy and chemical composition of native gold from twenty-seven representative orogenic gold deposits were investigated using optical microscopy, electron probe microanalysis (EPMA), and laser ablation-inductively coupled plasma-mass ...
Haiming Liu, G. Beaudoin, S. Makvandi, S. Jackson, Xiaowen Huang   +4 more
semanticscholar   +1 more source

Geology of the Lapa Orogenic Gold Deposit

2017
Abstract The Cadillac mining camp is known for its numerous, but relatively small, orogenic gold deposits, which are spatially associated with the Larder Lake-Cadillac fault zone. The Lapa deposit, with a total endowment of 36 t Au (1.15 Moz), represents the largest gold deposit of the Cadillac mining camp.
Patrick Mercier-Langevin, Marjorie Simard, Richard Dubuc, Jocelyn Côté, Pierre Doucet, Réal Daigneault, Damien Gaboury   +6 more
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Concepts and revised models for Phanerozoic orogenic gold deposits

Geological Society, London, Special Publications, 2022
Abstract Existing published models for orogenic gold deposits (OGDs) do not adequately describe or explain most deposits of Phanerozoic age, and there are numerous reasons why Phanerozoic OGDs might differ significantly from older deposits.
J. K. Mortensen, D. Craw, D. J. MacKenzie   +2 more
openaire   +1 more source

Contrast between metamorphic and ore-forming fluids in the Ailaoshan belt, southeastern Tibet: New constraints on ore-fluids source for its orogenic gold deposits

, 2021
The source of ore-forming fluids for orogenic gold deposits is still disputed with models ranging from derivation from metamorphism of continental crust to derivation from metasomatized mantle lithosphere.
Xuan Wang, Jun Deng, Qingfei Wang, Lin Yang, Huajian Li, Huazhi Yu, Peng Wang, Yiwei Song   +7 more
semanticscholar   +1 more source

Introduction: Macraes Mine as an Orogenic Gold Deposit

2016
Orogenic gold deposits are typically dominated by quartz veins in faults. Historic mining at Macraes focused on scattered small quartz veins, with only minor Au production. Modern exploration and mining has developed from these small beginnings into a world class mine operation which has produced >4 million ounces of Au from a total resource exceeding ...
Dave Craw, Doug MacKenzie
openaire   +1 more source

Chapter 8 Orogenic Gold Deposits of China

2019
Abstract China produces about 450 t Au per year and has government stated in-ground reserves of approximately 12,000 t Au. Orogenic gold, or gold deposits in metamorphic rocks, and associated placer deposits compose about 65 to 75% of this endowment, with lodes existing as structurally hosted vein and/or disseminated orebodies.
Richard Goldfarb, Kunfeng Qiu, Jun Deng, Yanjing Chen, Liqiang Yang   +4 more
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Chapter 38: Hydrothermal Gold Deposition in Epithermal, Carlin, and Orogenic Deposits

2020
Abstract Epithermal, Carlin, and orogenic Au deposits form in diverse geologic settings and over a wide range of depths, where Au precipitates from hydrothermal fluids in response to various physical and chemical processes. The compositions of Au-bearing sulfidic hydrothermal solutions across all three deposit types, however, are broadly
Stuart F. Simmons, Benjamin M. Tutolo, Shaun L.L. Barker, Richard J. Goldfarb, François Robert   +4 more
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Structural evolution of the orogenic gold deposits in central Victoria, Australia: The role of regional stress change and the tectonic regime

, 2020
This review synthesizes the main characteristics of the orogenic gold deposits in western and central Victoria, Australia, and presents new insights into the relationships between orogen-scale deformation and the 12 hard-rock gold deposits that have each
C. Wilson, D. Moore, S. Vollgger, Harry E. Madeley   +3 more
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Geophysical implications for the exploration of concealed orogenic gold deposits: A case study in the Sandy Lake and Favourable Lake Archean greenstone belts, Superior Province, Ontario, Canada

, 2020
Since 2000, gold discovery rates have not reflected the record levels of exploration expenditure, with those discoveries that are made being predominantly in areas of post-mineral cover.
D. Müller, K. Kwan, D. Groves
semanticscholar   +1 more source