Geophysical and Metalogenetic Modelling of the Copper Occurrence in Camaquã Sedimentary Basin, Brazilian Southern

Côrtes, Ariane Raissa Pinheiro; Moreira, César Augusto; Paes, Renata Augusta Sampaio; Veloso, Dimitri Ilich Kerbauy

doi:10.1007/s00024-019-02190-8

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…The step of acquiring data comprised a geophysical survey by land through the methods of DC Resistivity and Induced Polarization in the time domain. These have great applicability in mineral exploration of massive and/or disseminated sulfide bodies, and are independent methods, but present results of greater efficiency and safety when interpreted in conjunction (Cortês et al, 2019;Moreira et al, 2019a;Moreira et al, 2019b;Lenhare & Moreira, 2020).…”

Section: Resultsmentioning

confidence: 99%

Geophysical and structural survey in copper occurrence located in the northern region of the Camaquã basin (RS)

et al. 2021

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The geophysical diagnosis of mineral deposits can be extremely useful in detailing mineralized zones and is a strategy for direct sampling by probing holes for content analysis. This study involves the combined use of Electrical geophysical methods (DC resistivity and Induced Polarization), geological recognition and structural field analysis, with a study of the mineralized occurrence of copper, previously described in a systematic geochemical survey carried out by the Geological Survey of Brazil (CPRM), located in the north of the Camaquã Basin, extreme south of Brazil. The mineral occurrence is partially outcropped and consists of quartz vein shafts with malachite and relic structures of sulfides, contained in schist. Structural data obtained in the field revealed the existence of a system of fracture pairs in the directions N40-50W and N70-80E. Such information is presented in the programming of the geophysical data acquisition scheme, which consisted of 6 lines of electrical tomography with 410m each, in azimuthal disposition and Schlumberger arrangement, where all lines cross a single center and are separated according to an angle of 30°, in an attempt to cover fractures in various orientations. The 2D results reveal the existence of high chargeability zones (>40mV/V) positioned below the 40m depth. These data were interpolated in 3D visualization models and generated resistivity and chargeability maps for several depths, which integrated with previous structural data, and indicate the existence of zones with potential sulfide concentration with strong structural control, in addition to clear target recognition for direct and objective probing evaluation, with rationalization of costs.

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Section: Resultsmentioning

confidence: 99%

Geophysical and structural survey in copper occurrence located in the northern region of the Camaquã basin (RS)

et al. 2021

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“…The purpose of this paper is to present the application of qualitative and quantitative analyses of airborne and ground potential data to infer the structural mapping of subsurface and the configuration of cupriferous mineralizations. Although the Victor Teixeira and Capão Grande occurrences have already been the subject of geophysical studies (Moreira and Ilha, 2011;Pereira et al, 2016;Côrtes et al, 2016;Pereira et al, 2017;Côrtes et al, 2019;Bitencourt et al, 2020), this is the first study to our knowledge where a geophysical-structural framework is presented for the region.…”

Section: Introductionmentioning

confidence: 88%

Geophysical-Structural Framework in a Mineralized Region of Northwesternmost Camaquã Basin, Southern Brazil

Pereira

2021

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Airborne and ground magnetic and gravimetric maps provide important information about the spatial distribution of causative sources in the geological substrate. These sources normally have different physical and geometric properties and are located at different depths, making it difficult to identify the geological features that correspond to the sources. Filtering and enhancement techniques can be used to highlight features in potential field anomalies (such as center and edges of sources). Also, these techniques remove associated noise, isolate shallow from deep sources, and estimate depths. We applied enhancement and depth estimation techniques in airborne and ground potential field data to delineate a subsurface structural framework of two copper occurrences (Victor Teixeira and Capão Grande) in the northwestern border of Camaquã Basin with the Sul-Riograndense Shield. Our results confirmed previously recognized structures and revealed an interconnected structural framework, which has an estimated depth of 170 m by Euler solutions. This configuration suggests a possible connection between the two mineralization outcrops, which are separated by a distance of 2,300 m.

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“…Subsequently, the generation of 3D visualization models was made through the use of Oasis Montaj Platform (Geosoft), whose process of interpolation of the previous 2D geophysical products is based on the methods of kriging and minimum curvature, designed to guarantee the smoothing of the central values concerning the limits of the investigated area. The use of this kind of model, frequently applied in mineral prospection researches [62][63][64], makes possible a broad analysis of the hydrogeological conditions of the study area, including the identification of preferential groundwater pathways in the context of fractured and porous aquifer systems and delimitation of contamination plumes during the stages of characterization and monitoring of impacted sites [65][66][67].…”

Section: Methodsmentioning

confidence: 99%

Hydrogelogical characterization of a waste rock pile and bedrock affected by acid mine drainage from geophysical survey

et al. 2020

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Mining activities are known for the profound changes they cause in the environment, especially those related to environmental liabilities generated by these enterprises. One major concern of this sector relies on the acid mine drainage (AMD) process, which is formed by the exposure of sulfide minerals to oxidizing conditions. As a result, the production of low-pH saline waters favors the mobilization of heavy metals to the environment. In the last decades, the characterization and monitoring of contamination plumes have become more feasible due to the application of geophysical tools, more precisely the DC resistivity geophysical method. Thus, the aim of the present study is the application of electrical resistivity tomography to understand the hydrogeological dynamic of a waste rock pile in the Osamu Utsumi uranium mine, with the identification of preferred groundwater and AMD flow. The analysis of the 2D geophysical products allowed the differentiation of high salinity water accumulation zones (< 40 Ω m) in the interior of the pile. Likewise, the evaluation of the pseudo-3D model generated by the interpolation of 2D sections was crucial for the recognition of low resistivity zones within the bedrock, possibly controlled by fractures that work as recharge zones between the waste rock pile and the fractured aquifer. The identification of discharge and recharge zones related to the fractures system is a fundamental step for planning and actions to prevent water-sulfides interaction process, which is responsible for the generation of AMD, and also the installation of groundwater pumping systems.

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Geophysical and Metalogenetic Modelling of the Copper Occurrence in Camaquã Sedimentary Basin, Brazilian Southern

Cited by 11 publications

References 24 publications

Geophysical and structural survey in copper occurrence located in the northern region of the Camaquã basin (RS)

Geophysical and structural survey in copper occurrence located in the northern region of the Camaquã basin (RS)

Geophysical-Structural Framework in a Mineralized Region of Northwesternmost Camaquã Basin, Southern Brazil

Hydrogelogical characterization of a waste rock pile and bedrock affected by acid mine drainage from geophysical survey

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