Bjorn P. von der Heyden
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View article: Authigenic iron oxyhydroxide rims attenuate deleterious element fluxes during sulphide oxidation in historical gold mine tailings
Authigenic iron oxyhydroxide rims attenuate deleterious element fluxes during sulphide oxidation in historical gold mine tailings Open
Historical gold tailings pose environmental hazards globally, leading to acid mine drainage and the release of harmful elements due to the oxidation of unrecovered sulphides. The metastable secondary iron oxyhydroxides formed during this p…
View article: Authigenic iron oxyhydroxide rims attenuate deleterious element fluxes during sulphide oxidation in historical gold mine tailings
Authigenic iron oxyhydroxide rims attenuate deleterious element fluxes during sulphide oxidation in historical gold mine tailings Open
View article: Supplemental Material: Colloidal gold dispersions in orogenic gold from the Barberton Greenstone Belt, South Africa
Supplemental Material: Colloidal gold dispersions in orogenic gold from the Barberton Greenstone Belt, South Africa Open
Additional information related to the sampling protocol and the potential for experimental artefacts.
View article: Supplemental Material: Colloidal gold dispersions in orogenic gold from the Barberton Greenstone Belt, South Africa
Supplemental Material: Colloidal gold dispersions in orogenic gold from the Barberton Greenstone Belt, South Africa Open
Additional information related to the sampling protocol and the potential for experimental artefacts.
View article: Enhanced classification of pyrite generations based on mineral chemistry using uniform manifold approximation and projection (UMAP)
Enhanced classification of pyrite generations based on mineral chemistry using uniform manifold approximation and projection (UMAP) Open
Trace element signatures are tracked to unravel the genetic history of ore deposits in several mineral systems. This is particularly true for pyrite, a ubiquitous component of many ore-forming systems, including orogenic gold deposits. Her…
View article: Multistage evolution of gold mineralization in the Kibali gold district: Insights from pyrite analyses
Multistage evolution of gold mineralization in the Kibali gold district: Insights from pyrite analyses Open
The Kibali gold district, located on the Congo Craton, comprises a Neoarchean gold resource exceeding 28.7 Moz. The district is located within a westerly-verging stacked fold-and-thrust belt associated with a compressional tectonic regime …
View article: Characterizing low-grade refractory gold ores using automated mineralogy coupled with LA ICP-MS
Characterizing low-grade refractory gold ores using automated mineralogy coupled with LA ICP-MS Open
Researchers have made notable progress in quantifying refractory components causing gold losses in traditional extraction methods. The potential for improving gold recoveries lies in targeted re-treatment of the 'invisible' gold fraction h…
View article: Zimbabwe's coloured gemstone endowments - A regional geological overview
Zimbabwe's coloured gemstone endowments - A regional geological overview Open
Zimbabwe hosts a varied array of coloured gemstones. With the exception of emerald deposits and several world-class pegmatites, few of the gemstone occurrences have received detailed attention from the scientific or mineral exploration com…
View article: Characterization of Gold in Complex Historical Refractory Tailings for Enhanced Process Optimization
Characterization of Gold in Complex Historical Refractory Tailings for Enhanced Process Optimization Open
Historical gold tailings show promise as a secondary resource amid declining primary deposits, yet conventional cyanidation falls short, resulting in recoveries below 90%. An essential pre-treatment process is crucial for optimal recovery,…
View article: Growth and Stability of Stratiform Carrollite (CuCo2S4) in the Tenke-Fungurume Ore District, Central African Copperbelt
Growth and Stability of Stratiform Carrollite (CuCo2S4) in the Tenke-Fungurume Ore District, Central African Copperbelt Open
Carrollite (CuCo2S4) is the main ore mineral of the critical battery metal cobalt, yet, surprisingly, detailed characterization of its thermodynamic properties and of its trace element contents remain sparse in the scientific literature. T…
View article: Formation of Cu–Au porphyry deposits: hydraulic quartz veins, magmatic processes and constraints from chlorine
Formation of Cu–Au porphyry deposits: hydraulic quartz veins, magmatic processes and constraints from chlorine Open
Copper–gold porphyry deposits are the world’s main source of copper and a significant source of gold. They consist of vein networks and their surrounding alteration zones. Commonly the deposits are centred on narrow intrusions (stocks), bu…
View article: A rest potential study of impurity (As, Au, Ni and Co) bearing synthetic pyrite in alkaline flotation conditions
A rest potential study of impurity (As, Au, Ni and Co) bearing synthetic pyrite in alkaline flotation conditions Open
View article: A paleoplacer component to the gold hosted in meta-conglomeratic units of the Neoarchaean moto greenstone belt, DRC
A paleoplacer component to the gold hosted in meta-conglomeratic units of the Neoarchaean moto greenstone belt, DRC Open
The giant Karagba-Chauffeur-Durba (KCD) gold deposit and its peripheral gold satellite deposits are located within the Kibali gold district in the Neoarchaean Moto Greenstone Belt in the northeast of the Congo Craton, Democratic Republic o…
View article: An underexploited invisible gold resource in the Archean sulphides of the Witwatersrand tailings dumps
An underexploited invisible gold resource in the Archean sulphides of the Witwatersrand tailings dumps Open
View article: The origin and evolution of the ore-forming fluids at the Manondo-Choma gold prospect, Kirk range, southern Malawi
The origin and evolution of the ore-forming fluids at the Manondo-Choma gold prospect, Kirk range, southern Malawi Open
This study provides an in-depth analysis of fluid inclusions (FIs) and stable isotopes from the Manondo-Choma gold prospect in southern Malawi to understand the ore-forming mechanisms, genesis, and evolution of the hydrothermal fluids resp…
View article: Unlocking pyrite LA-ICP-MS trace elements: the power of dimensionality reduction using synergy between UMAP, PCA and k-Means clustering
Unlocking pyrite LA-ICP-MS trace elements: the power of dimensionality reduction using synergy between UMAP, PCA and k-Means clustering Open
View article: Invisible gold in the Archean detrital sulphides of the Witwatersrand tailings dumps: A large and under-exploited gold resource
Invisible gold in the Archean detrital sulphides of the Witwatersrand tailings dumps: A large and under-exploited gold resource Open
The tailings dumps originating from gold mining in South Africa’s Witwatersrand still contain notable gold endowments. Most tailings reprocessing operations target a native gold fraction using re-milling and carbon-in-leach extraction; how…
View article: Invisible gold in the Archean detrital sulphides of the Witwatersrand tailings dumps: A large and under-exploited gold resource
Invisible gold in the Archean detrital sulphides of the Witwatersrand tailings dumps: A large and under-exploited gold resource Open
The tailings dumps originating from gold mining in South Africa’s Witwatersrand still contain notable gold endowments. Most tailings reprocessing operations target a native gold fraction using re-milling and carbon-in-leach extraction; how…
View article: Activity Report of the Second African Conference on Fundamental and Applied Physics, ACP2021
Activity Report of the Second African Conference on Fundamental and Applied Physics, ACP2021 Open
The African School of Fundamental Physics and Applications, also known as the African School of Physics (ASP), was initiated in 2010, as a three-week biennial event, to offer additional training in fundamental and applied physics to Africa…
View article: Trace elements in pyrite from five different gold ore deposit classes: a review and meta-analysis
Trace elements in pyrite from five different gold ore deposit classes: a review and meta-analysis Open
Data for PCA and temperature
View article: A critical comparison between the Fungurume 8 and 88 Cu-Co deposits, Central African Copperbelt
A critical comparison between the Fungurume 8 and 88 Cu-Co deposits, Central African Copperbelt Open
The Fungurume 88 deposit located in the Tenke-Fungurume Mining (TFM) district is situated in the northern extent of the Central African Copperbelt (CACB). It is an unusual sedimentary stratiform copper (SSC) deposit of this area, since it …
View article: Gold Exploration in Two and Three Dimensions: Improved and Correlative Insights from Microscopy and X-Ray Computed Tomography
Gold Exploration in Two and Three Dimensions: Improved and Correlative Insights from Microscopy and X-Ray Computed Tomography Open
In this contribution, we highlight a correlative approach in which three-dimensional structural/positional data are combined with two dimensional chemical and mineralogical data to understand a complex orogenic gold mineralization system; …
View article: A novel economic-filter for evaluating sub-Saharan diamondiferous kimberlites
A novel economic-filter for evaluating sub-Saharan diamondiferous kimberlites Open
SYNOPSIS Because of their high degree of geological complexity, kimberlite-hosted diamond deposits are exceedingly difficult to evaluate for economic viability. Accordingly, standard mineral asset evaluation protocols (e.g., the Cost-, Mar…
View article: Iron-Rich Nanoparticles in Natural Aquatic Environments
Iron-Rich Nanoparticles in Natural Aquatic Environments Open
Naturally-occurring iron nanoparticles constitute a quantitatively-important and biogeochemically-active component of the broader Earth ecosystem. Yet detailed insights into their chemical speciation is sparse compared to the body of work …
View article: A collaborative auto-ethnographic exploration of socially just practices by new academics in two South African higher education institutions
A collaborative auto-ethnographic exploration of socially just practices by new academics in two South African higher education institutions Open
CITATION: Collett, K. S., et al. 2018. A collaborative auto-ethnographic exploration of socially just practices by new academics in two South African higher education institutions. South African Journal of Higher Education, 32(6):582-603, …
View article: Interviews with professional geologists enhance learning about the applied aspects of economic geology for final-year university students
Interviews with professional geologists enhance learning about the applied aspects of economic geology for final-year university students Open
A novel learning intervention has been developed and tested in which honor’s level Earth science students were tasked with conducting interviews with established geologists working in the Southern African minerals sector. The task was desi…
View article: Interviews with professional geologists enhance learning about the applied aspects of economic geology for final-year university students
Interviews with professional geologists enhance learning about the applied aspects of economic geology for final-year university students Open
A novel learning intervention has been developed and tested in which honor’s level Earth science students were tasked with conducting interviews with established geologists working in the Southern African minerals sector. The task was desi…
View article: Investigating nanoscale mineral compositions: Iron<i>L</i><sub>3</sub>-edge spectroscopic evaluation of iron oxide and oxy-hydroxide coordination
Investigating nanoscale mineral compositions: Iron<i>L</i><sub>3</sub>-edge spectroscopic evaluation of iron oxide and oxy-hydroxide coordination Open
The iron (Fe) L2,3-edge X-ray absorption near-edge structure (XANES) spectrum is sensitive to the local coordination environment around the Fe metal center, making it a useful probe for understanding Fe mineral speciation. The two dominant…
View article: Application, Chemical Interaction and Fate of Iron Minerals in Polluted Sediment and Soils
Application, Chemical Interaction and Fate of Iron Minerals in Polluted Sediment and Soils Open