Geophysics for the Mineral Exploration Geoscientist

Dentith, Mike; Mudge, Stephen T.

doi:10.1017/cbo9781139024358

Cited by 265 publications

(254 citation statements)

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“…ERT is a common geophysical technique used to investigate subsurface geometry and to characterize ground materials in mineral exploration, archaeology and environmental studies, among others (Dentith and Mudge, 2014). ERT is a common geophysical technique used to investigate subsurface geometry and to characterize ground materials in mineral exploration, archaeology and environmental studies, among others (Dentith and Mudge, 2014).…”

Section: Quantification Of Sediment Trapped By the Check Damsmentioning

confidence: 99%

“…Ground resistivity (in Ω m) is related to various geological parameters, such as the mineral content, porosity and degree of water saturation in the substrata (Dentith and Mudge, 2014). Ground resistivity (in Ω m) is related to various geological parameters, such as the mineral content, porosity and degree of water saturation in the substrata (Dentith and Mudge, 2014).…”

Section: Quantification Of Sediment Trapped By the Check Damsmentioning

confidence: 99%

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Waste dump erosional landform stability – a critical issue for mountain mining

Martín‐Moreno

Duque

Ibarra

et al. 2018

Earth Surf Processes Landf

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Mining is the largest producer of solid wastes which, when released to land or into waterways, can cause harmful environmental impacts. This is mostly due to fluvial erosion, which is highly increased in mountain areas, due to abrupt slopes. We have analysed this situation at a mountain watershed (192 ha), where steep mined sites and their waste dumps are the main source of sediment in a Natural Park. This problem was tackled by building gabion check dams downstream from the mined sites. We used the DEM of Differences (DoD) method to quantify erosion and sediment yield from three waste dumps (5 ha). Their topography and substrate properties were analysed to understand the erosion problem. The sediment trapped by the check dams was quantified by electrical resistivity tomography (ERT). The rainfall characteristics triggering an episode that filled the check dams with sediment in the winter 2009–2010, were studied to confirm whether it was a case of extreme precipitation conditions. The waste dumps sediment yield (353 ± 95 Mg ha−1 yr−1) suggests severe landform instability. Analysis of topographic and substrate properties confirmed long, steep slopes combined with highly erodible materials. The check dams proved to be inefficient in controlling sediment loads, as they had only functioned for four years of 31 of existence, having trapped 13 000 ± 660 m3 of sediment, whereas we estimated that the waste dumps have yielded approximately three times more sediment for the same period. Rainfall analyses showed that neither intense nor extreme conditions (return period of 25 to 35 years) triggered the mobilization of 37 ± 2 Mg ha−1 in a month. This study highlights the fact that mining operations in similar mountainous settings, with equivalent waste dump construction and reclamation practices, are currently unfeasible. We conclude that landform stability cannot be achieved at this site without landform changes. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Quantification Of Sediment Trapped By the Check Damsmentioning

confidence: 99%

Section: Quantification Of Sediment Trapped By the Check Damsmentioning

confidence: 99%

Waste dump erosional landform stability – a critical issue for mountain mining

Martín‐Moreno

Duque

Ibarra

et al. 2018

Earth Surf Processes Landf

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“…Since, as it was mentioned in Section 2.1.1, it is possible that there is non-outcropping granite in the region [40][41][42], the simultaneous existence of high radiation values and high lineament density may be an indication for underlying granitic masses. On the other hand, high radiation values may also be related to superficial materials, namely black shales and siliciclastic sedimentary originating from the erosion of igneous rocks (arkoses) [62], which both occur in the region [63]. Figure 19 shows the natural gamma radiation map overlain by the known mineral occurrences and mapped lineaments and also the lineament density map.…”

Section: Lineaments and Radiometric Datamentioning

confidence: 99%

Remote Sensing for Mineral Exploration in Central Portugal

et al. 2017

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Central Portugal is well known for the existence of Sn-W and Au-Ag mineral occurrences primarily associated with hydrothermal processes. Despite the economic and strategic importance of such occurrences, the detailed geology of this particular region is poorly known and there is an obvious absence of geological mapping at an adequate scale. Remote sensing techniques were used in order to increase current geological knowledge of the Góis-Castanheira de Pêra area (600 km 2 ) and to guide future exploration stages by targeting and prioritising potential locations. Digital image processing algorithms, such as Red, Green, Blue (RGB) colour composites, digital spatial filters, band ratios and Principal Components Analysis, were applied to Landsat 8 imagery and elevation data. Lineaments were extracted relying on geological photointerpretation criteria, allowing the identification of new geological-structural elements. Fieldwork was carried out in order to validate the remote sensing interpretations. Integration of remote sensing data with other information sources led to the definition of locations possibly suitable for hosting Sn-W and Au-Ag mineral occurrences. These areas were ranked according to their mineral potential. Targeting the most promising locations resulted in a reduction to less than 10% of the original study area (50.5 km 2 ).

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“…In general, the important of radiometric surveys is for the discovery of uranium deposits but also further note that radiometric surveys can be effectively used for mapping alteration zones [12].…”

Section: Geophysical Mapmentioning

confidence: 99%

Integrated Interpretation of Geophysical and Soil Geochemical Anomalies in Gold Exploration: Case of Kouremale, Southern Mali-West Africa

Tounkara¹,

Chen²,

Keita³

2017

IJG

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Detecting the anomalies' sources location in the vast territory such as Kouremale area is a grand challenge for geophysicists because there is a need to assess gold deposit. Therefore, this paper aims to recommend a methodological approach on applied magnetic survey and soil geochemistry to identify the location of anomalies' sources. To that aim the study is divided into phases. In the first phase, the maps for integrated interpretation have been produced by Geosoft Oasis and ArcGIS 10.2.1. The corrected and processed magnetic data with eliminated diurnal variation have been used. Phase two consist of integrate geochemical soil map. The results of phase one identified four magnetic anomalies zones (MAZ) with their coordinates. Thus, the obtained radiometric map, showed that there is a high intensity of K and Th compared to U, which indicates a significant weathering process and there are many saprolithes in study area. The findings of phase two revealed that there is a high concentration of gold content (1500 ppm) with an average concentration of 92 ppm. The integrated interpretation map coming from the combined different maps, referring to the geological information verified on the field, led to conclude that, the target B is the best gold anomaly. The delimitation of the space of the target B from the geophysical and geochemical information confirmed the existence of limited, restricted and potential anomaly.

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Geophysics for the Mineral Exploration Geoscientist

Cited by 265 publications

References 0 publications

Waste dump erosional landform stability – a critical issue for mountain mining

Waste dump erosional landform stability – a critical issue for mountain mining

Remote Sensing for Mineral Exploration in Central Portugal

Integrated Interpretation of Geophysical and Soil Geochemical Anomalies in Gold Exploration: Case of Kouremale, Southern Mali-West Africa

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