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Dissertations / Theses on the topic 'Gold ores – Geology – Africa, Southern'

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Published: 4 June 2021
Last updated: 10 February 2022

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1

Whitfield, Derek. "The genesis and controls of gold mineralization south of Rehoboth, Namibia." Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1005560.

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Gold mineralization is hosted within gossanous quartz-haematite veins in volcano-sedimentary lithologies of the Klein Aub - Rehoboth basin of the Irumide Belt, Namibia. Mineralization and hydrothermal alteration are restricted to deformed lithologies particularly the metasediments. Lithological relationships, geochemistry and metallogenic characteristics of the Irumide Belt suggest an intra-continental rift setting. Copper mineralization is well known along the length of the belt, from Klein Aub in the southwest to Ghanzi in the northeast, whereas gold mineralization appears restricted to the
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2

Latorre, J. J. "Exploration for stratabound copper, lead and zinc deposits in the Damara-Katanga orogen, central-southern Africa." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005558.

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The Damara-Katanga orogen in central-southern Africa represents an area of 1.73xl0⁶ sq. km. The region is considered one of the wealthiest metallogenic provinces in the world. Successful exploration for stratabound base-metal deposits has taken place at this particular area since the introduction of more organised methodology in the early 1920s. The genesis, location and distribution of the ore deposits are related to their tectonic settings. Geodynamic evolution of the orogen, which initially formed part of a complex Pan-African rift system, comprises the following stages rifting; downwarping
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3

Breedt, Machiel Christoffel. "Gold exploration in tropical and sub-tropical terrains with special emphasis on Central and Western Africa." Thesis, Rhodes University, 1996. http://hdl.handle.net/10962/d1005578.

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The aim of this dissertation is an attempt to' provide a general guide for future gold exploration in tropical and sub-tropical terrains. The dissertation includes a brief discussion of the various exploration techniques used in regional and local exploration. This provide the necessary background knowledge to discriminate between the constraints and applications and to be able to select the techniques which are more suitable for gold exploration in tropical and sub-tropical terrains. Weathering, gold geochemistry and soil formation, fields often neglected, are emphasized to illustrate the imp
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4

Day, Stephen John. "Sampling stream sediments for gold in mineral exploration, southern British Columbia." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/27869.

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The problems encountered by mineral explorationists when sampling stream sediments for gold were investigated by considering the sparsity of free gold particles and their tendency to form small placers at certain locations in the stream bed. Fourteen 20-kg samples of -5-mm sediment were collected from contrasting energy and geochemical environments in five streams draining gold occurrences in southern British Columbia. The samples were sieved to six size fractions (420 µm to 52 µm) and gold content was determined by neutron activation analysis following preparation of two density fractions us
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5

Sibbick, Steven John Norman. "The distribution and behaviour of gold in soils in the vicinity of gold mineralization, Nickel Plate mine, southern British Columbia." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28862.

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Sampling of soils and till are conventional methods of gold exploration in glaciated regions. However, the exact nature of the residence sites and behaviour of gold within soil and till are poorly known. A gold dispersion train extending from the Nickel Plate mine, Hedley, southwest British Columbia, was investigated in order to determine the distribution and behaviour of gold within soils developed from till. Three hundred and twelve soil, till and humus samples (representing LFH, A, B and C horizons) were collected from fifty-two soil pits and thirty-four roadcut locations within the disper
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6

Franey, N. J. "A geological model of shear zone gold deposits in the Pietersburg Greenstone Belt, South Africa." Thesis, Rhodes University, 1987. http://hdl.handle.net/10962/d1007190.

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The Pletersburg greenstone belt Is located In South Africa, about 300 km northeast of Johannesburg. It hosts a significant amount of gold mineralization and just over 1000 kg of gold have been produced from Its various reefs and secondary deposits. The greenstone belt is interpreted as an Archean ophiolite complex. It comprlses a volcano-sedimentary succession (the Pletersburg Group) which Is subdivided Into a basal greenstone sequence, interpreted as oceanic crust, and an upper sedimentary cover sequence. A number of major shear zones, which are thought to represent thrusts that developed dur
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7

Linklater, Michael Anthony Leonard Flanders. "The exploration for and possible genesis of, some Archaean granite/gneiss-hosted gold deposits in the Pietersburg granite-greenstone terrane." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005557.

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Abstract The gold mineralization event within Archaean granite-greenstone terranes occurred during the late Archaean, and followed the intrusion of syn- to late-tectonic granitic plutons into previously deformed greenstone belts. An Archaean granite/gneiss-hosted gold deposit, in terms of this project, is classified as having a gold-assay cutoff of 1g/metric ton over widths of at least several metres, or higher grades over narrower widths and/or verbal descriptions that indicate such values. Fluid inclusion studies and isotopic data identify two possible origins for the auriferous fluids; name
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8

De, Klerk Ian Duncan. "The nature and origin of gold mineralization in the Tugela valley, Natal Structural and Metamorphic Province." Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1005591.

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The project area is situated within the Tugela Valley, located in the Northern Marginal Zone of the Natal Structural and Metamorphic Province, and this work outlines the different styles of gold mineralization found in the Tugela Valley. Two different styles have been recognized and both have economic significance:- 1) Epigenetic shear zone-hosted gold occurs in late-stage relatively undeformed thin quartz veins confined to shear zones, and is present in both the greenschist facies Natal Thrust Belt and the amphibolite facies Natal Nappe Complex. However the vast majority of these occurrences
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9

Dwyer, Gordon Bransby. "The geology of the Welkom Goldfield with special reference to the "A", "B" and Beatrix Reefs." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1005575.

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The first Witwatersrand gold deposits in the Orange Free State were discovered under younger cover rocks in the 1930's with the aid of drilling and geophysics. The Welkom gold deposits are found in the sedimentary rock sequences of the Central Rand Group, which represent unconformity bounded genetic packages. The structural configuration of the goldfield is one of a north to south trending synform that is split near it's axis by the De Bron and Homestead faults. The "B" Reef is a highly variable, erratically mineralised reef that lies on an unconformity at the base of the Spes Bona Formation.
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10

Blamey, Nigel John Frederick. "The geology and evaluation of the "A"-reef at No.3 shaft, Western Holdings Mine, Welkom goldfield." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005569.

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The "A" -Reef occurs within the Aandenk Formation of the Central Rand Group, Witwatersrand Supergroup, in the Welkom Goldfield. It comprises the Witpan and Uitsig Reefs which are both oligomictic conglomerates, and are exploited for their gold content by Anglo American Corporation. The main Witpan channel complex is orientated in a NW-SE direction and occurs close to No.3 Shaft of Western Holdings Mine where it is currently being mined. The Witpan Reef varies in thickness from 7-220cm, with lateral facies changes controlling the thickness. Within the reef, gold is associated with degradation s
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11

Bullen, Warwick David. "Gold mineralization in an archaean granite-greenstone remnant west of Melmoth, Natal ore genesis and implications for exploration." Thesis, Rhodes University, 1991. http://hdl.handle.net/10962/d1005579.

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The previously undifferentiated, "Melmoth Granite-Greenstone Remnant" (MGGR¹) crops out over an area of about 360 km² in northern Natal, South Africa. The greenstone sequence is comprised mainly of mafic metalavas with lesser serpentinite, talc schist, dacitic tuff, quartz-muscovite schist, quartzite and calc-silicate rocks. The greenstones are intruded by syntectonic trondhjemitic gneisses, late-tectonic granodioritic gneisses and post-tectonic granite dykes. Four phases of deformation and metamorphism are recognized. Epigenetic, disseminated and quartz vein-hosted gold mineralization is asso
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12

Gapara, Cornwell Sine. "A review of the deposition of iron-formation and genesis of the related iron ore deposits as a guide to exploration for Precambrian iron ore deposits in southern Africa." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1005610.

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Iron-formations are ferruginous sedimentary rocks which have their source from fumarolic activity associated with submarine volcanism, with deposition of iron as oxides, hydroxides, and hydrous oxide-silicate minerals in shallow and/or deep marine sedimentary systems. The Precambrian ironformations of southern Africa have a wide age range, but are more prominently developed before 1.SGa. These iron formations occur in greenstone belts of the Kaapvaal and Zimbabwean cratons, in the Limpopo mobile belt, in cratonic basins and in the Damara mobile belt. The Archaean-Proterozoic sedimentary basins
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13

Dopavogui, Joseph Siba. "Structural assessment of the Koulekoun Gold Deposit, Guinea, West Africa." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1018201.

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The Koulekoun Gold project is the most important prospect of Avocet Mining plc. It is one of the projects within the TriK-block in Guinea (West Africa) for which an exploration permit has been granted. The Koulekoun deposit is located within the Siguiri basin of Birimian age in the Eastern Guinea region; where most Guinea’s gold mines are situated. The present study involves the investigation of structural elements (S₀, S₁, S₂, intrusive contacts, faults and veins) from selected drill cores from drill sections that intersect the Koulekoun orebody in four parts of the deposit; characterizes the
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14

Zhou, Yongzhang. "Géochimie et mécanisme métallogénique du district aurifère de Hetai, sud de la Chine = Geochimistry and metallogenetic mechanism of the Hetai gold field, southern China /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1992. http://theses.uqac.ca.

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Thèse (D.R.Min.) -- Université du Québec à Chicoutimi, 1992.<br>These présentée en collaboration de l'Université du Québec à Chicoutimi et Institute of geochemistry, Academia Sinica. CaQCU Document électronique également accessible en format PDF. CaQCU
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15

Hammond, Napoleon Quaye. "The geochemistry of ore fluids and control of gold mineralization in banded iron-formation at the Kalahari Goldridge deposit, Kraaipan greenstone belt, South Africa." Thesis, Rhodes University, 2003. http://hdl.handle.net/10962/d1008370.

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The Kalahari Goldridge mine is located within the Archaean Kraaipan Greenstone Belt about 60 km SW of Mafikeng in the Northwestern Province, South Africa. Several gold deposits are located within approximately north - south-striking banded iron-formation (BIF). Current opencast mining operations are focused on the largest of these (D Zone). The orebody is stratabound and hosted primarily in the BIF, which consists of alternating chert and magnetite-chloritestilpnomelane-sulphide-carbonate bands ranging from mm to cm scale. The ore body varies in thickness from 15 to 45 m along a strike length
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16

Boer, Rudolf Hans. "Physico-chemical conditions of mineralization in the Sabie-Pilgrim's Rest Goldfield, Eastern Transvaal." Thesis, 2016. http://hdl.handle.net/10539/20867.

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A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, for the Degree of Doctor of Philosophy Johannesburg, 1995<br>A different class of mesothermal gold deposit at Sabie-Pilgrim’s Rest is described which is probably associated with the Bushveld igneous event in South Africa. Pressure and temperature estimates indicate that the ore-fluids of the Sabie-Pilgrim's Rest Goldfield, which occurs within the early Proterozoic Transvaal Supergroup, were similar to those of mesothermal gold deposits. [Abbreviated abstract. Open document ot view full vers
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17

Hicks, Nigel. "A combined sedimentological-mineralogical study of sediment-hosted gold and uranium mineralization at Denny Dalton, Pongola Supergroup, South Africa." Thesis, 2009. http://hdl.handle.net/10413/1194.

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The ~2.98 - 2.87 Ga Pongola Supergroup in South Africa is subdivided into the lower volcano-sedimentary Nsuze Group, and the upper sedimentary Mozaan Group, the latter comprising a several kilometres thick succession of fluvial to shallow marine sandstones and shales. Thin beds of gold and uranium-bearing conglomerates are locally present in the Mandeva Formation near the base of the Mozaan Group and have been mined at Denny Dalton in northern KwaZulu-Natal. The style of mineralization strongly resembles that of the Witwatersrand goldfields, however appears to be of low grade and limited tonna
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18

Ross, F. W. J. "The development and some practical applications of a statistical value distribution theory for the Witwatersrand auriferous deposits." Thesis, 2015. http://hdl.handle.net/10539/19240.

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19

Zhao, Baojin. "A mineralogical and geochemical study of alteration associated with the Ventersdorp Contact Reef in the Witwatersrand Basin, South Africa." Thesis, 1998. https://hdl.handle.net/10539/26387.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy,<br>The Ventersdorp Contact Reef(VCR) is a major gold-bearing reef in the Witwatersrand Basin. It occurs between the overlying Klipriviersberg Group lavas and the underlying Central Rand Group sediments, and was strongly altered by hydrothermal fluids circulating in the Witwatersrand Basin. A detailed study of the mineralogy, geochemistry of rocks and minerals, physicochemical conditions, stable isotopes and ages of hydrothe
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20

"Alteration and gold mineralisation in the Roodepoort Goldfield, Pietersburg Granite-Greenstone Terrane." Thesis, 2014. http://hdl.handle.net/10210/12896.

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21

"A geometallurgical characterization of the Vaal Reef - a facies at Moab Khotsong Mine, AngloGold Ashanti, with specific focus on gold and uranium deportment." Thesis, 2015. http://hdl.handle.net/10210/13708.

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M.Sc. (Geology)<br>The Witwatersrand Supergroup is host to a number of auriferous and uraniferous conglomeratic reefs, which have been extensively exploited along the Witwatersrand Basin margins. The current study investigates the Vaal Reef, in the Klerksdorp gold field with particular focus on conducting a geometallurgical characterization of the ore which may ultimately enhance the recovery of gold and uranium and our understanding of how the ore responds to processing. Six samples were collected from AngloGold Ashanti’s Moab Khotsong mine and prepared for a chemical and mineralogical deport
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22

Sieber, Thomas. "Styles of hydrothermal alteration in archaean rocks of the Northern Kaapvaal craton, South Africa, with implications for gold mineralization." Thesis, 2014. http://hdl.handle.net/10210/9336.

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Ph.D. (Geology)<br>Shear zone controlled hydrothermal alteration zones in the northern Kaapvaal craton (NKC) are developed in host rocks of vastly different chemical composition and metamorphic grade. Some carry appreciable Au and base metals and some are barren. Alteration zones in three different distinctive crustal zones were examined in detail to determine the controls of these two types of alteration. 1. The Matok Complex is situated in the southern marginal zone (SMZ) of the Limpopo Belt (LB), close to the zone of rehydration. Two major stages of hydrothermal alteration could be identifi
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23

"A geometallurgical examination of gold, uranium and thorium in the Black Reef Quartzite Formation, Gold One International LTD, Springs." Thesis, 2015. http://hdl.handle.net/10388/ETD-2015-10-2274.

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An exhibition thesis from Xiao Han, who presents large photographs as ‘stills’ from a fictitious movie set in late 20th century China, after the suppression of the Tiananmen Square Protest and the inauguration of the one- Child policy. The artist plays multiple roles in sites that are specifically gendered, to expose the exceptional impact the population control laws had on women. Traumatized social and psychic perspectives emerge from the political turmoil, registering as uncanny absences and repressed delays.
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24

Genis, Jac H. "The sedimentology and depositional environment of the Beatrix Reef: Witwatersrand supergroup." Thesis, 1990. https://hdl.handle.net/10539/25042.

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A Dissertation Submitted to the Faculty of Science University of the Witwatersrand, Johannesburg for the Degree of Master of Science.<br>Beatrix Mine is located 35 km south of the city of Welkom in the Welkom Goldfield and as such forms the most southerly of the Witwatersrand-type gold mines. The Beatrix Reef overlies an angular unconformity at the base of the Turffontein Subgroup, Central Rand Group Significant, southerly truncation of over 600m of the Johannesburg Subgroup, and the lower formations of the Turffontein Subgroup, occur at this unconformity in the Beatrix area.. char
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