Results 141 to 150 of about 462 (183)

Aseismic Refinement of Orogenic Gold Systems

2018
Orogenic gold deposits contribute the majority of gold recovered globally throughout history. However, the mechanism that concentrates gold to extremely high “bonanza” grades within these deposits remains enigmatic. The volume of fluid experimentally required to provide such endowments of gold in a localised area is not reflected in field observations (
Voisey, Christopher, Willis, David, Wilson, Chris, Micklethwaite, Steven, Tomkins, Andrew, Salvemin, Floriana   +5 more
openaire   +1 more source

Supergene gold mobility in orogenic gold deposits, Otago Schist, New Zealand

New Zealand Journal of Geology and Geophysics, 2015
Gold has been chemically mobilised by groundwater from host sulphide minerals in orogenic gold deposits of Otago. Mobilisation occurred near the Cenozoic Otago Schist erosional surface beneath a sedimentary cover. Initial Au mobilisation, on a scale of micrometres, occurred when solid solution and microparticulate gold in pyrite and arsenopyrite grains
D Craw, D MacKenzie, P Grieve
openaire   +1 more source

Intrusion-related versus orogenic gold, Western Lachlan Orogen, Tasmanides, Australia

Long-lived accretionary orogens like the Tasmanides of eastern Australia have typically undergone a series of compressional and extensional episodes with multiple magmatic and hydrothermal events that shape its rheological, compositional and metallogenic character.
Coralie Siégel, Fariba Kohan Pour, Cameron Cairns, Helen McFarlane, Ross Cayley, Zsanett Pintér, Michael Verrall, Colin MacRae, James Lewis   +8 more
openaire   +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
openaire   +1 more source

Orogenic gold mineralization at the Chah Bagh deposit, Muteh gold district, Iran

Journal of Asian Earth Sciences, 2014
Abstract The Chah Bagh gold deposit, in the Muteh gold district, is located in the central part of the Sanandaj-Sirjan zone (SSZ), Iran. Gold mineralization at Chah Bagh is hosted by a Paleozoic sequence of rocks that is dominated by deformed schist, metarhyolite, and amphibolite that exhibits a greenschist- to lower amphibolite-facies metamorphism ...
Hossein Kouhestani, Nematollah Rashidnejad-Omran, Ebrahim Rastad, Mohammad Mohajjel, Richard J. Goldfarb, Majid Ghaderi   +5 more
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
openaire   +1 more source

Structural controls on orogenic gold deposits

Acta Petrologica Sinica, 2023
Lin YANG, QingFei WANG, ShiYu ZHAO, HuaJian LI, HeSen ZHAO, ChaoYi DONG, XueFei LIU, Jun DENG   +7 more
openaire   +1 more source

Gold mobility in Archean metasedimentary belts: Implications for orogenic gold deposits

Geology
The southern Superior Province (Canada) comprises large metasedimentary belts, such as the Pontiac and Quetico subprovinces, adjacent to Au-endowed greenstone belts. The Pontiac sedimentary rocks have been proposed as a source of Au for the highly endowed southern Abitibi greenstone belt.
Diogo Ribeiro, Bertrand Rottier, Antoine Godet, Georges Beaudoin, Clifford G.C. Patten, Carl Guilmette, Adrian G. Rehm, Isaac S. Malta, Jochen Kolb, Douglas K. Tinkham, Iain Pitcairn   +10 more
openaire   +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

Cenozoic orogenic gold system in Tibet

Acta Petrologica Sinica, 2020
WANG QingFei, DENG Jun, WENG WeiJun, LI HuaJian, WANG Xuan, LI GongJian   +5 more
openaire   +1 more source