Structural And Metamorphic Evolution Of The Ormsby Zone And Relative Timing Of Gold Mineralization A Newly Defined Archean Orogenic Gold Prospect Hosted On The Discovery Property Yellowknife Greenstone Belt Slave Province Canada
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Structural And Metamorphic Evolution Of The Ormsby Zone And Relative Timing Of Gold Mineralization A Newly Defined Archean Orogenic Gold Prospect Hosted On The Discovery Property Yellowknife Greenstone Belt Slave Province Canada
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Author :
language : en
Publisher:
Release Date : 2001
Structural And Metamorphic Evolution Of The Ormsby Zone And Relative Timing Of Gold Mineralization A Newly Defined Archean Orogenic Gold Prospect Hosted On The Discovery Property Yellowknife Greenstone Belt Slave Province Canada written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
The Yellowknife greenstone belt has produced approximately 14 million ounces of gold, 13 of which came from the well explored southern half of the belt. The northern half of the belt, where the Discovery Property (1 million ounce past producer) is located, is not as well explored, but geologically very similar to the gold producing southern half. Gold on the Discovery Property, Northwest Territories, has been historically mined from a quartz vein formed adjacent to Archean metabasaltic bodies enclosed in metasedimentary rocks. Some of the metasedimentary rocks are correlated to the Archean Banting Group, based on a U-Pb age of 2.66 Ga on zircon (SHRIMP-RG). The metabasalt is correlated to the Banting Group based on its deposition relationship with the adjacent metasedimentary rocks. The Banting Group is present in the Yellowknife greenstone belt, located near the well-known Con and Giant Mines near Yellowknife, 90 km to the south. The two gold deposits forming the Discovery Property contains almost 2 million ounces in past production and current resources. The historical Discovery Mine was developed in quartz veins hosted in the metasedimentary rocks folded around the northern tip of one of the metabasalt bodies. In contrast, the newly defined Ormsby Zone consists of gold in silicified and sulphidized domains within metamorphosed pillowed and brecciated mafic volcanic rocks, and shares many characteristics with other Archean Orogenic gold deposits. Pyrrhotite " arsenopyrite is directly correlated with the gold-bearing zones. Gold is also associated with pyrite and retrograde phases of chlorite, sericite and carbonate. Through detailed outcrop mapping and petrography the history of structural and metamorphic events are sequenced and the relative time of gold mineralization placed into the geological framework. Peak-metamorphic mineral assemblages on the property record upper greenschist to amphibolite facies conditions. Rocks on the Discovery Property have undergone.
A Regional Structural Model For Gold Mineralization In The Southern Part Of The Archean Superior Province United States
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Author : Paul Kibler Sims
language : en
Publisher:
Release Date : 1992
A Regional Structural Model For Gold Mineralization In The Southern Part Of The Archean Superior Province United States written by Paul Kibler Sims and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Geology, Stratigraphic categories.
The Canadian segment of the Archean Superior province is a major world source of lode gold. The gold deposits occur in or near regional transcurrent and oblique slip-shear deformation zones that comprise a conjugate set to a northwest- directed compression of the Superior province. These structures provided permeable pathways for the flow of large volumes of auriferous fluid derived from an external source. Historic gold production from the United States segment of the Superior province is modest, but the close similarity in the geologic environment of the United States and Canadian segments suggests that large gold deposits should be present in the U.S.A. An occurrence model largely based on known parameters of gold mineralization in Canada suggests that the greenstone-granite terranes of the Wawa and Wabigoon sub-provinces in the United States are favorable for important gold deposits. The model suggests that gold mineralization took place during or later than the transcurrent faulting and that it took place contemporaneously with emplacement of silica-undersaturated intrusions. The faulting occurred late in the igneous-tectonic history of the Superior province, about 2,690 Ma. Extensive, intense alteration comprising carbonitization, silicification, and sulfidization accompanied the gold mineralization. The relationships between alteration minerals and mineralized veins suggest a close temporal relationship between the alteration and gold mineralization processes. The proposed occurrence model for gold mineralization and the available data suggest that two broad regions of greenstone in the Archean Superior province in north-central United States are particularly favorable for gold deposits: (1) the Upper Peninsula of Michigan, and (2) northeastern Minnesota. The Ishpeming greenstone belt of the Wawa subprovince in Michigan contains the important Ropes deposit and several other known gold occurrences, and the Vermilion district (Wawa subprovince) in northeastern Minnesota contains highly anomalous gold in soils and minor known bedrock occurrences. Transcurrent faults in both areas should be favorable sites for gold mineralization
A Review Of Archean Orogenic Gold Deposits In Greenstone Belts And The Slave Province
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Author : Thomas Keegan Branson
language : en
Publisher:
Release Date : 2013
A Review Of Archean Orogenic Gold Deposits In Greenstone Belts And The Slave Province written by Thomas Keegan Branson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Gold mines and mining categories.
Greenstone Gold And Crustal Evolution
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Author : Geological Association of Canada. Mineral Deposits Division
language : en
Publisher: St. John's, Nfld. : Geological Association of Canada
Release Date : 1991
Greenstone Gold And Crustal Evolution written by Geological Association of Canada. Mineral Deposits Division and has been published by St. John's, Nfld. : Geological Association of Canada this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Gold ores categories.
Formation Of Gold Deposits
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Author : Neil Phillips
language : en
Publisher: Springer Nature
Release Date : 2022-06-16
Formation Of Gold Deposits written by Neil Phillips and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-06-16 with Science categories.
This book addresses the origin of gold deposits to answer questions of science and curiosity. These answers contribute in turn to the improved exploration and mining of gold. Initially there is a summary of the methods used to address the genesis of gold deposits including some of the essential science and concepts. Five basic observations follow that apply to many gold deposits and need to be considered in any genetic ideas. Magmatic processes enriching gold are discussed followed by the role of aqueous fluids during gold deposit formation at elevated temperatures and pressures. Modifying effects after deposit formation include high-grade metamorphism, retrogression, weathering, and erosion. The main types of gold deposits are then explained within the spectrum of viable genetic ideas, with informal names for these examples that include gold-only, gold-plus, Carlin, slate-belt, epithermal, porphyry, iron oxide copper gold, and Archean greenstone. Case histories are included in which the role of gold geology contributed directly to discoveries—one example is at the province-scale and another at the goldfield-scale. Unlike other books on the subject, this one addresses virtually all gold deposit types rather than focusing on one type in isolation. The primary readership includes industry geologists, senior undergraduates, postgraduates, and those with some knowledge of science and an interest in the gold industry.
Archean Lode Gold Deposits In Ontario
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Author : A. C. Colvine
language : en
Publisher:
Release Date : 1988
Archean Lode Gold Deposits In Ontario written by A. C. Colvine and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Science categories.
A Regional Structural Model For Gold Mineralization In The Southern Part Of The Archean Superior Province United States
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Author : Paul Kibler Sims
language : en
Publisher:
Release Date : 1992
A Regional Structural Model For Gold Mineralization In The Southern Part Of The Archean Superior Province United States written by Paul Kibler Sims and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Geology, Stratigraphic categories.
Macraes Orogenic Gold Deposit New Zealand
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Author : Dave Craw
language : en
Publisher: Springer
Release Date : 2016-08-10
Macraes Orogenic Gold Deposit New Zealand written by Dave Craw and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-08-10 with Science categories.
This book describes the nature and origin of the Macraes gold deposit. It also documents the key features of this spectacular deposit for a wide range of professionals in the resource geology community. This world-class gold deposit has been a spectacular geological and economic success story, as it has developed from a small historical gold mine in discontinuous quartz veins measuring only meters to a large-scale mine in deposits spreading over kilometres in extensive disseminated gold-bearing rock.
Stratigraphy Structure And Geochronology Of Archean Lode Gold Deposits In The Southeastern Rice Lake Greenstone Belt Southeast Manitoba
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Author : Xiaohui Zhou
language : en
Publisher:
Release Date : 2017
Stratigraphy Structure And Geochronology Of Archean Lode Gold Deposits In The Southeastern Rice Lake Greenstone Belt Southeast Manitoba written by Xiaohui Zhou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Geological time categories.
The Central Manitoba mine trend is one of the most important lode gold camps in the Rice Lake greenstone-granitoid belt of the western Uchi Subprovince within the western Superior Province, Manitoba, Canada. Neoarchean host rocks consist of a south-facing volcano-sedimentary succession (2.75-2.73 Ga) intruded by voluminous gabbroic sills and tonalitic-granodioritic plutons (2.73-2.72 Ga), as well as late aplite dikes (2.73-2.72 Ga) and quartz-feldspar porphyry dikes (2.73-2.71 Ga). Five generations of deformation structures have been recognized through detailed geological mapping. The entire succession was folded during early deformation prior to rare late aplite dike emplacement. All fault-fill veins and extension veins cut all lithologic units, and are structurally governed by late conjugate shear zones. Main gold mineralization occurs within fault-fill veins hosted by west-trending steeply-dipping dextral brittle-ductile and ductile shear zones, which occur along or across contacts of metabasalt, metagreywacke and metagabbro or entirely within metagabbro. Microstructural and paragenetic analyses on main gold-bearing veins have revealed that gold is intimately associated with quartz, pyrrhotite and tellurobismuthite. Main gold introduction is interpreted to have taken place contemporaneously with pyrrhotite and tellurobismuthite deposition early during dextral shearing. The Ogama-Rockland gold deposit consists of shear zone-associated quartz veins hosted by the Ross River pluton, a ca. 2728-2724 Ma tonalitic-granodioritic intrusion in supracrustal rocks (
Geology Of The Archean C T Gold Au Cu Intrusion Related Deposit Swayze Greenstone Belt Ontario
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Author : Laura Rachel Katz
language : en
Publisher:
Release Date : 2016
Geology Of The Archean C T Gold Au Cu Intrusion Related Deposit Swayze Greenstone Belt Ontario written by Laura Rachel Katz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The Côté Gold Au(-Cu) deposit is a low-grade, large-tonnage type deposit with an indicated resource of 269 Mt averaging 0.88 g/t Au (7.61 M oz) and an inferred resource of 44 Mt averaging 0.74 g/t Au (1.04 M oz) at a cut-off grade of 0.3 g/t Au. The deposit is located in the Swayze greenstone belt (SGB), part of the larger and gold-rich Abitibi Subprovince and is the first large gold deposit to be discovered in the SGB. The deposit is hosted by multi-phase tonalite, diorite and quartz diorite intrusions of the Chester intrusive complex (CIC), a multi-phased, laccolith-shaped synvolcanic intrusion. Crosscutting relationships suggest coeval emplacement of the host rocks and high-precision UPb ID-TIMS zircon geochronology results constrain the CIC to ca. 2741 to 2739 Ma. Although a close temporal relationship exists between the tonalite and dioritic phases, they appear to be petrogenetically unrelated. The CIC is demonstrated to be petrologically, texturally and geochemically similar to low-Al tonalite-trondhjemite-diorite composite intrusions known to underlie VMS-type mineralization. The CIC was emplaced into tholeiitic mafic metavolcanic rocks of the Arbutus Formation that are interpreted to have formed in a back-arc environment. The CIC is coeval and cogenetic with the felsic to intermediate rocks of the Yeo Formation. Emplacement of the CIC into a shallow crustal level is inferred based on the incorporation of screens and inclusions of the Yeo Formation, consistent with the presence of textures, such as granophyres, miarolitic cavities and pegmatites, and Al-in hornblende geobarometry results of ≤1.3 ± 0.6 kbars. The intrusive complex is intruded by several younger and petrogenetically unrelated dike phases, as well as overprinted by regional deformation events. iv The deposit has a large ore envelope (1200 m by 300 m) within which several styles of mineralization (breccias, disseminations and veins) that are co-spatial and cogenetic to hydrothermal alteration are recognized. The hydrothermal stages consist of: (1) a rare series of gold-bearing amphibole-rich veins and breccias spatially restricted to the south and central parts of the deposit; (2) an extensive, main-stage biotite alteration that is centred on Au- and Cubearing hydrothermal biotite breccia bodies. Outwards from the breccia are veins (stockworks and sheeted arrays) and disseminations; (3) an extensive, Au ± Cu-bearing fracture-controlled and replacement-style muscovite alteration in the centre of the deposit; (4) an unmineralized fracture-controlled and disseminated epidote alteration that is localized to the north of the deposit; (5) a texturally destructive albite alteration occurs in the central part of the deposit; and (6) chlorite alteration that overprints biotite alteration. Drill core observations suggest that all the hydrothermal events, except chloritization, broadly overlap with magmatism and are crudely zoned on the deposit scale; chloritization is considered to be metamorphic in origin. To constrain the timing of hydrothermal events U-Pb ID-TIMS, SHRIMP and LA ICPMS dating of four hydrothermal titanites from amphibole and albite alteration assemblages and Re-Os dating of two molybdenite samples were analyzed. The hydrothermal titanite ages are centred on a ca. 2740 Ma and the molybdenite ages are 2736.1 ± 11.4 Ma and 2746.8 ± 11.4 Ma. These ages overlap with magmatism and strongly support a syn-intrusion timing for alteration and gold mineralization. Importantly, this age represents a new metallogenic gold event in the Abitibi Subprovince. In addition, two rutile ages at ca. 2667 Ma were obtained and indicate the deposit was affected by subsequent thermal events, such as regional metamorphism. Several of the alteration types (i.e., amphibole, biotite, muscovite and epidote) are considered to be genetically related to the dioritic phases of the CIC based on relative timing, v distribution, mineralogy and mineral chemistry and whole-rock geochemistry. The progressive crystallization of the dioritic magma chamber is considered to have resulted in the generation of mineralized magmatic-hydrothermal fluids that are thought to be responsible for generating the Côté Gold deposit. The sequence of alteration types, their zonation in the deposit and their chemistry (i.e., gains and losses, REE patterns, metal associations and isotopes) is consistent with the early hydrothermal stages (i.e., amphibole and biotite) having formed from high temperature magmatic-derived dioritic fluids and the later alteration types (i.e., muscovite and epidote) having formed from cooling magmatic fluids mixed with seawater. The development of albite alteration is thought to be the result of volatile exsolution of tonalite based on its syn-intrusion timing and the Na-rich nature of the fluids. Although albite alteration may be gold-bearing, the erratic distribution of the mineralization and the leaching capacity of fluids suggest earlier gold was remobilized during this event. Considering the characteristics of the host rocks, the demonstrated overlap of magmatic and hydrothermal events at ca. 2740 Ma, the nature and distribution of alteration, the style of the associated mineralization and the geochemical characteristics of the hydrothermal fluids the Côté Gold deposit is considered to be intrusion-related in origin and formed in a manner similar to Phanerozoic porphyry-type deposits.