Geochemical and morphological characteristics of gold particles from recent river deposits and the fossil placers of the Witwatersrand

Hallbauer, D. K.; Utter, T.

doi:10.1007/bf00206168

Cited by 81 publications

(44 citation statements)

References 11 publications

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“…Morphological characteristics of placer gold grains have been used by several workers as indicators of transport from source (e.g., Hallbauer and Utter, 1977;Knight et al, 1999b;Townley et al, 2003). Useful correlation of shape modification with distance may be restricted to studies of drainage with the same or similar geomorphological evolution; however identification of gold grains very close to source is usually straightforward and based upon characteristics such as angularity, the presence of fragments of host minerals or rock, or imprints of the original matrix (Townley et al, 2003).…”

Section: Other Characteristics Of Placer Gold Grainsmentioning

confidence: 99%

Application of microchemical characterization of placer gold grains to exploration for epithermal gold mineralization in regions of poor exposure

Chapman

Mortensen

2006

Journal of Geochemical Exploration

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Section: Other Characteristics Of Placer Gold Grainsmentioning

confidence: 99%

Application of microchemical characterization of placer gold grains to exploration for epithermal gold mineralization in regions of poor exposure

Chapman

Mortensen

2006

Journal of Geochemical Exploration

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“…6d). The preservation of at least part of the crystalline morphology is characteristic of alluvial gold particles transported for short distances in rivers and streams (Hallbauer and Utter, 1977).…”

Section: Geochemical Sampling Resultsmentioning

confidence: 99%

“…The rims underwent silver leaching during stream transport. Well-aired river water has a high oxygen fugacity and provides the oxidizing environment necessary to dissolve silver (Hallbauer and Utter, 1977).…”

Section: Gold Particles Researchmentioning

confidence: 99%

Primary Au prospecting results in the Logrosán area (Central Iberian Zone, Spain).

Cheremazova¹,

Скублов²,

Новоселов³

et al. 2015

Journal of Iberian Geology

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The Central Iberian Zone presents an exceptional geological interest for its great exploration potential for a number of elements including gold. Metallogeny within the area is mainly related to regional metamorphism and late magmatic activity during the Variscan orogeny. In 2013-2014 junior company Mineral Exploration Network Ltd. has carried out an extensive prospecting field work with a primarily view to discover Au within the area around Logrosan granitic pluton (Cáceres, Spain). The main output of the survey was a localization and presorting of potentially mineralized territory unites at the extensive spatial scale (more than 240 sq. km). The known gold showings in the Central Iberian zone are considered to be synorogenic with a mainly metamorphic fluid source. As arsenic commonly forms widespread geochemical haloes near practically all orogenic gold deposits and appears to be easily and credibly measured by express analytical methods (XRF), it was selected as one of the major pathfinder elements for the initial prospecting. Designed geochemical survey allowed delineating potential target area with contrastive complex As-W-Zn-Pb anomaly in soil sediments and significant quantities of gold particles in heavy mineral concentrates. Placer gold particles analyses and their typomorphic features confirmed nearby primary gold source existence. The suggested scope of work proved to be efficient for assessing mineralization potential and selecting perspective target areas for a detailed drilling.Keywords: gold exploration, Central Iberian Zone, pan concentrate, geochemical soil sampling, Iberian Variscan Belt Resumen La Zona Centro Ibérica muestra un interés geológico excepcional debido a su gran potencial de exploración de gran número de elementos, incluido el oro. La metalogenia en esta área está relacionada con un metamorfismo regional y posterior actividad magmática durante la orogenia Varisca. Durante el periodo 2013-2014, la compañía Mineral Exploration Network Ltd llevó a cabo una prospección importante en el campo con una primera observación de Au dentro del área del plutón granítico de Logrosan (Cáceres, España). El primer objetivo de la campaña fue la localización y acotamiento de la zona potencialmente mineralizada a gran escala (más de 20 Km2). El oro descrito es considerado sinorogénico con una fuente principal relacionada con fluidos metamórficos. Como el arsénico aparece frecuentemente constituyendo geoquímicos halos cerca de la mayoría de los depósitos orogénicos de oro y parecen ser medidos fácilmente mediante métodos analíticos (XRF), fue seleccionado como uno de los principales elementos marcadores para realizar la prospección inicial. Los análisis geoquímicos seleccionados permitieron delimitar la zona de interés mediante el contraste del complejo anómalo As-W-Zn-Pb en los sedimentos del suelo y cantidades significativas de partículas de oro en concentraciones de minerales pesados. Los análisis de las partículas de los placeres de oro y sus características tipomórficas confirmaron inicial...

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“…The diagram shows comparison between frequency of occurrences of microtextures in Izok Lake till magnetite, Wahianoa magnetite, and Weichselian quartz. and Utter, 1977;Townley et al, 2003). However, comparing the results of magnetite with gold is not useful to understand transport conditions of magnetite, because these minerals differ noticeably in their physical properties.…”

Section: Comparison Between Izok Lake Detrital Magnetite and Previousmentioning

confidence: 96%

“…Averill and Zimmerman, 1986;Fisher, 1945;Grant et al, 1991;Knight and McTaggart, 1986;Knight et al, 1999;Stendal and Theobald, 1994;Utter, 1979;Youngson and Craw, 1999). Some researchers have suggested that the morphological evolution of gold particles is a function of the transport media as well as the distance of transport (e.g DiLabio, 1991;Giusti, 1987;Hallbauer and Utter, 1977;Herail et al, 1989;Townley et al, 2003). DiLabio (1991) proposed a simple classification for characterization of the shape and surface textures of gold particles in till.…”

Section: Introductionmentioning

confidence: 96%

The surface texture and morphology of magnetite from the Izok Lake volcanogenic massive sulfide deposit and local glacial sediments, Nunavut, Canada: Application to mineral exploration

Makvandi

Beaudoin

McClenaghan

et al. 2015

Journal of Geochemical Exploration

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Geochemical and morphological characteristics of gold particles from recent river deposits and the fossil placers of the Witwatersrand

Cited by 81 publications

References 11 publications

Application of microchemical characterization of placer gold grains to exploration for epithermal gold mineralization in regions of poor exposure

Application of microchemical characterization of placer gold grains to exploration for epithermal gold mineralization in regions of poor exposure

Primary Au prospecting results in the Logrosán area (Central Iberian Zone, Spain).

The surface texture and morphology of magnetite from the Izok Lake volcanogenic massive sulfide deposit and local glacial sediments, Nunavut, Canada: Application to mineral exploration

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