Results 141 to 150 of about 292 (182)

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

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

Metabasalts as sources of metals in orogenic gold deposits

Mineralium Deposita, 2014
Although metabasaltic rocks have been suggested to be important source rocks for orogenic gold deposits, the mobility of Au and related elements (As, Sb, Se, and Hg) from these rocks during alteration and metamorphism is poorly constrained. We investigate the effects of increasing metamorphic grade on the concentrations of Au and related elements in a ...
Pitcairn, Iain K., Craw, Dave, Teagle, Damon A.H.   +2 more
openaire   +2 more sources

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 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
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

Orogenic Gold Mineralization in the Qolqoleh Deposit, Northwestern Iran

Resource Geology, 2007
AbstractThe Qolqoleh gold deposit is located in the northwestern part of the Sanandai‐Sirjan Zone, northwest of Iran. Gold mineralization in the Qolqoleh deposit is almost entirely confined to a series of steeply dipping ductile–brittle shear zones generated during Late Cretaceous–Tertiary continental collision between the Afro‐Arabian and the Iranian ...
Farhang Aliyari, Ebrahim Rastad, Hou Zengqian   +2 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

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

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

Geology
Abstract 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