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Epithermal Gold for Explorationists Australian Institute

Epithermal quartz gold silver deposits (Corbett and Leach, 1998) are characterised by the presence of bonanza gold grades possibly to hundreds of g/t (e.g., Porgera Zone VII, Photo 17; Mt Kare; Thames; Edie Creek, Photo 18), locally giving rise to significant alluvial gold deposits (e.g., Mt Kare, Edie Creek). Veins also comprise quartz, even in alkaline silica poor systems (e.g., Porgera Zone

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Post deformation, sulphide quartz vein hosted gold ore in

The Långdal ore is situated close to this break that may have focussed fluid flow during metamorphism and deformation. The orientation of the contact indicates that it either is a D2 structure or that it was at least active during D2. The structural development in the altered footwall rocks to the Långdal VHMS ore indicates that gold bearing sulphide and sulphide quartz veins both pre and

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Structural ontrols and Deformation History of the Orogenic

Island Gold deposit V1 and V2 ore veins were emplaced sub parallel to S 2 foliation along a strain shadow created by the Webb Lake Stock during D2 north side up

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Relationships between deformation and mesothermal veins in

on the silver ore deposits; this is certainly the case for the Sunshine Mine and surrounding area. Fault kinematic history in the district shows a regional scale faultsystem reactivated over time with dextral, sinistral, and dip slip displacement. The fault system is superimposed on regional deformation fabrics that were examined for this study in the Sunshine Mine area. Cleavage sets observed

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Crustal scale shear zones and their significance to

regions for auriferous fluids and ore components. 100 2O0km t Lvlalnly urur.uc gneluu a.u ur~rlltulos ]Gneiss mechanical behaviour of the rocks during

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181123 Release Golden Mile drilling intersects graphitic

Image 2. RC drill chips from drill hole LD18RC006. Note the fresh graphitic black shale shear zone For personal use only . with interbedded quartz veining and visible sulphides commences at approximately 58 m down hole, to the end of hole. The historic high grade gold Little Duke ore zone is interpreted within Ironstone located down hole from approximately 48 m 53 m. Image 3. Geological

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Deformation and gold mineralisation of the Archaean

Deformation and gold mineralisation of the Archaean Pilbara Craton, Western Australia Richard Blewett1 David L. Huston1 Early to late Archaean (3600Œ2780Ma)

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Costerfield antimony gold deposit, southeast Australia

/ Costerfield antimony gold deposit, southeast Australia : Coupling between brittle deformation and dissolution precipitation reactions in the Melbourne Zone. In:

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The Ida Shear Zone Monash University

The Ida Shear Zone Ch. 2.5.1: Weinberg, R.F., Groves, D.I., Hodkiewicz, P., van der Borgh, P., Hydrothermal Systems, Giant Ore Deposits, Yilgarn Atlas Volume III UWA Gold Module, Part 1, AMIRA Project P511 Summary of the Ida and Zuleika Shear Zones Gold deposits along the Ida and Zuleika Shear Zones share some similarities, in that, in both

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GEOLOGICAL TARGETING STUDY HIGHLIGHTS GOLD

eastern limb intersecting the Zuleika Shear Zone in the vicinity of the Kundana gold camp (Figure 8). Doleritic rocks provide a rheological and chemically favourable lithology for the formation of gold deposits and are an ore body scale control on mineralisation (McCuaig and Kerrich, 1998). In particular, the

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Resource maps energymining.sa.gov.au

1VD image showing: operation status of mineral projects; production as at February 2020; mineral commodities ; petroleum pipelines; Download South Australia mineral projects (February 2020; PDF 2.6 MB) Mineral projects layer is available via SARIG (click All Map Layers and search projects) Selected South Australian resources. Surface geology over DTM showing location by commodity of: selected

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Gawler Craton energymining.sa.gov.au

Deformation in the central Gawler Craton was partitioned into shear zones, including the E W trending Yerda shear zone and N S trending Yarlbrinda shear zone in the central Gawler Craton, and the N S trending Bulgunnia shear zone along the southern margin of the Mount Woods inlier. On the Eyre Peninsula retrograde shear zones with a dip slip movement developed at this time.

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The structural controls of gold mineralisation within the

systems. Deformation within the BTZ was relatively simple and is associated with tight to iso clinal folding and reverse to transpressive shear zones over a <12 km wide area of high straining, where lithological contacts have been rotated towards the plane of maximum shortening. These structures control gold mineralisation and also correspond

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Structural geometry of orogenic gold deposits

1/7/2018· For orogenic gold deposits at deeper crustal levels, ore forming fluids are commonly focused along strain gradients between more compressional zones where

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Mesothermal and Greenstone Gold Deposits AKA Orogenic

23/11/2016· But even globally shears zone hosted deposits are major contributors to annual gold production. As we mention mesothermal veins to form from the earliest period of the earths history right up until today. However the majority of the greenstone belt gold deposit formed in two main pulses at the end of the Archean and in the early Proterozoic. I.e. around 2.7 billion years ago and 2.1 billion

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Shear zones, fault networks, and Archean gold Geology

Conjugate ductile shear zones developed mostly on granite greenstone margins are a dominant structural feature of the Yilgarn craton. These greenstone beltscale shear zones lack both gold deposits and gold related alteration. Previous interpretations of the shear zones as part of a linked system, as craton scale terrane boundaries, or as crustal scale pathways for gold mineralizing fluids

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Deformation (engineering)

In engineering, deformation refers to the change in size or shape of an object. Displacements are the absolute change in position of a point on the object.Deflection is the relative change in external displacements on an object.Strain is the relative internal change in shape of an infinitesimally small cube of material and can be expressed as a non dimensional change in length or angle of

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Mesothermal and Greenstone Gold Deposits AKA Orogenic

23/11/2016· But even globally shears zone hosted deposits are major contributors to annual gold production. As we mention mesothermal veins to form from the earliest period of the earths history right up until today. However the majority of the greenstone belt gold deposit formed in two main pulses at the end of the Archean and in the early Proterozoic. I.e. around 2.7 billion years ago and 2.1 billion

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Timing of structural deformation and age of mineralization

1/10/2020· With respect to ore controlling structures in the northern ShiquanHanyin gold orefield, Wu et al., 1992, Feng and Yang, 1994 observed and measured structures at

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The Ida Shear Zone Monash University

The Ida Shear Zone Ch. 2.5.1: Weinberg, R.F., Groves, D.I., Hodkiewicz, P., van der Borgh, P., Hydrothermal Systems, Giant Ore Deposits, Yilgarn Atlas Volume III UWA Gold Module, Part 1, AMIRA Project P511 Summary of the Ida and Zuleika Shear Zones Gold deposits along the Ida and Zuleika Shear Zones share some similarities, in that, in both

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Old Gold: An Introduction to Archean Greenstone Belts

29/10/2014· Ore formation Gold and quartz from hydrothermal vein through a greenstone from the (Image CC) The ore forming fluids are thought to come from intruded granites or the dehydration of the rocks themselves as they are being metamorphosed. These sulphur bearing fluids redistribute the gold, which is not very compatible with other elements, along shear zones toward the surface. These

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GEOLOGICAL TARGETING STUDY HIGHLIGHTS GOLD

eastern limb intersecting the Zuleika Shear Zone in the vicinity of the Kundana gold camp (Figure 8). Doleritic rocks provide a rheological and chemically favourable lithology for the formation of gold deposits and are an ore body scale control on mineralisation (McCuaig and Kerrich, 1998). In particular, the

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Home Orezone Gold Corporation

Orezone Gold Corporation (ORE:TSX.V) is a Canadian development company which owns a 90% interest in Bomboré, one of the largest undeveloped gold deposits in Burkina Faso. Bomboré hosts a large oxide resource underlain by a larger, open sulphide resource, and will be developed in two stages. Orezone is now fully funded to bring Bomboré into production with the first gold pour scheduled for

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VMS Volcanogenic Massive Sulphide Ore Deposits

24/4/2015· Average Volcanogenic Massive Sulphide Ore Deposits Grades: 5% copper. 4% zinc. < 1% lead. Maybe 1 gram per tonne of gold. Again there are a few outlines with far higher grades than these. Lets look now at a few examples of VMS deposits. Nevsuns Bisha deposit near Eritrea is a superb example of a VMS deposit.

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The characteristic of microstructural deformation of gold

1/7/2020· TEM images of pyrite exhibit evidence for crystal plastic deformation within the zone free pyrite. Massive distortions are widespread in pyrite grains by

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The structural controls of gold mineralisation within the

systems. Deformation within the BTZ was relatively simple and is associated with tight to iso clinal folding and reverse to transpressive shear zones over a

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Gawler Craton energymining.sa.gov.au

Deformation in the central Gawler Craton was partitioned into shear zones, including the E W trending Yerda shear zone and N S trending Yarlbrinda shear zone

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Relationships between deformation and mesothermal veins in

on the silver ore deposits; this is certainly the case for the Sunshine Mine and surrounding area. Fault kinematic history in the district shows a regional scale

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VMS Volcanogenic Massive Sulphide Ore Deposits

24/4/2015· Average Volcanogenic Massive Sulphide Ore Deposits Grades: 5% copper. 4% zinc. < 1% lead. Maybe 1 gram per tonne of gold. Again there are a few outlines with far higher grades than these. Lets look now at a few examples of VMS deposits. Nevsuns Bisha deposit near Eritrea is a superb example of a VMS deposit.

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Ground support modelling involving large ground

deformation: Simulation of field observations depth of 1195 m in the J ore zone. The field investigations were conducted in Cut #4 of Stope J10 3. Investigations in Cut #5 of J10 3 and Cut #1 in Stope J10 4 were part of a different project and therefore are not reported in this paper. The vertical sections through Y825, Y850 and Y875 are shown in Figure 3. R1 to R10 represent the breasting

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