Thrust-controlled gold mineralisation at the Elandshoogte Mine, Sabie-Pilgrim's Rest goldfield, South Africa

Harley, Michael; Charlesworth, E.G.

doi:10.1007/bf00197096

Cited by 13 publications

(5 citation statements)

References 8 publications

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“…This raises the possibility that the gold mineralization in the Witwatesberg and SabiePilgrimÕs Rest Goldfields could be pene-contemporaneous, because Harley and Charlesworth (1992) have suggested that the mineralization in the Sabie-PilgrimÕs Rest Goldfield is pre-to syn-Bushveld in age. It is tempting to link the genesis of all of these gold deposits to the heat flow related to the intrusion of the Bushveld Complex but further work is required before such a conclusion can be drawn.…”

Section: Discussionmentioning

confidence: 99%

“…Harley and Charlesworth, 1992). • A deformational event with vergence outward from the area now occupied by the Bushveld Complex (southward in the Witwatersberg Goldfield and towards the east-southeast in the Sabie-PilgrimÕs Rest Goldfield, Harley and Charlesworth, 1992) seems to have been important in the genesis of the gold deposits. • The age of the mineralization could be similar.…”

Section: Structural Synthesismentioning

confidence: 99%

“…• The age of the mineralization could be similar. It has been argued above that the mineralization in the Witwatersberg Goldfield predates the intrusion of the Bushveld Complex and Harley and Charlesworth (1992) have concluded that the gold deposits of the Sabie-PilgrimÕs Rest Goldfield are pre-to synBushveld Complex in age.…”

Section: Structural Synthesismentioning

confidence: 99%

“…Nevertheless, some deposits in the Sabie-PilgrimÕs Rest Goldfield are hosted by the Timeball Hill Formation (Harley and Charlesworth, 1992).…”

Section: Structural Synthesismentioning

confidence: 99%

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Controls to hydrothermal gold mineralization in the Witwatersberg Goldfield; situated in the floor to the south of the Bushveld Complex, South Africa

Killick

Scheepers

2005

Journal of African Earth Sciences

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Section: Discussionmentioning

confidence: 99%

Section: Structural Synthesismentioning

confidence: 99%

Section: Structural Synthesismentioning

confidence: 99%

“…Nevertheless, some deposits in the Sabie-PilgrimÕs Rest Goldfield are hosted by the Timeball Hill Formation (Harley and Charlesworth, 1992).…”

Section: Structural Synthesismentioning

confidence: 99%

See 2 more Smart Citations

Controls to hydrothermal gold mineralization in the Witwatersberg Goldfield; situated in the floor to the south of the Bushveld Complex, South Africa

Killick

Scheepers

2005

Journal of African Earth Sciences

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“…The Transvaal Basin was intruded by the Bushveld Igneous Complex at 2.06 Ga (Zeh et al, 2015;Mungall et al, 2016). Previous studies have demonstrated that the intrusion of the Bushveld Igneous Complex may have led to additional mineral tenor in the Transvaal Basin, such as the formation of hydrothermal Au deposits in carbonate rocks (e.g., the Elandshoogte and Pilgrims rest gold deposits; Harley & Charlesworth, 1992;Eriksson et al, 1995).…”

Section: Regional Geologymentioning

confidence: 99%

Data-Driven Predictive Modeling of Lithofacies and Fe In-Situ Grade in the Assen Fe Ore Deposit of the Transvaal Supergroup (South Africa) and Implications on the Genesis of Banded Iron Formations

et al. 2022

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The Assen Fe ore deposit is a banded iron formation (BIF)-hosted orebody, occurring in the Penge Formation of the Transvaal Supergroup, located 50 km northwest of Pretoria in South Africa. Most BIF-hosted Fe ore deposits have experienced post-depositional alteration including supergene enrichment of Fe and low-grade regional metamorphism. Unlike most of the known BIF-hosted Fe ore deposits, high-grade hematite (> 60% Fe) in the Assen Fe ore deposit is located along the lithological contacts with dolerite intrusions. Due to the variability in alteration levels, identifying the lithologies present within the various parts of the Assen Fe ore deposit, specifically within the weathering zone, is often challenging. To address this challenge, machine learning was applied to enable the automatic classification of rock types identified within the Assen Fe ore mine and to predict the in-situ Fe grade. This classification is based on geochemical analyses, as well as petrography and geological mapping. A total of 21 diamond core drill cores were sampled at 1 m intervals, covering all the lithofacies present at Assen mine. These were analyzed for major elements and oxides by means of X-ray fluorescence spectrometry. Numerous machine learning algorithms were trained, tested and cross-validated for automated lithofacies classification and prediction of in-situ Fe grade, namely (a) k-nearest neighbors, (b) elastic-net, (c) support vector machines (SVMs), (d) adaptive boosting, (e) random forest, (f) logistic regression, (g) Naïve Bayes, (h) artificial neural network (ANN) and (i) Gaussian process algorithms. Random forest, SVM and ANN classifiers yield high classification accuracy scores during model training, testing and cross-validation. For in-situ Fe grade prediction, the same algorithms also consistently yielded the best results. The predictability of in-situ Fe grade on a per-lithology basis, combined with the fact that CaO and SiO2 were the strongest predictors of Fe concentration, support the hypothesis that the process that led to Fe enrichment in the Assen Fe ore deposit is dominated by supergene processes. Moreover, we show that predictive modeling can be used to demonstrate that in this case, the main differentiator between the predictability of Fe concentration between different lithofacies lies in the strength of multivariate elemental associations between Fe and other oxides. Localized high-grade Fe ore along with lithological contacts with dolerite intrusion is indicative of intra-basinal fluid circulation from an already Fe-enriched hematite. These findings have a wider implication on lithofacies classification in weathered rocks and mobility of economic valuable elements such as Fe.

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Thrust-controlled, gold quartz-vein mineralisation at the Tom's Gully mine, Northern Territory, Australia

Sheppard

1996

Mineral. Deposita

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Thrust-controlled gold mineralisation at the Elandshoogte Mine, Sabie-Pilgrim's Rest goldfield, South Africa

Cited by 13 publications

References 8 publications

Controls to hydrothermal gold mineralization in the Witwatersberg Goldfield; situated in the floor to the south of the Bushveld Complex, South Africa

Controls to hydrothermal gold mineralization in the Witwatersberg Goldfield; situated in the floor to the south of the Bushveld Complex, South Africa

Data-Driven Predictive Modeling of Lithofacies and Fe In-Situ Grade in the Assen Fe Ore Deposit of the Transvaal Supergroup (South Africa) and Implications on the Genesis of Banded Iron Formations

Thrust-controlled, gold quartz-vein mineralisation at the Tom's Gully mine, Northern Territory, Australia

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