Recognition of Sulfides Zones in Marble Mine Through Comparative Analysis of Electrical Tomography Arrangements

Moreira, César Augusto; Santos, Evandro Gomes dos; Ilha, Lenon Melo; Paes, Renata Augusta Sampaio

doi:10.1007/s00024-019-02243-y

Cited by 8 publications

(2 citation statements)

References 23 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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“…Especially, to identify mineralization zones with a low-grade ore. One of the geophysical techniques that can be applied effectively for that is the geoelectrical technique (DCIP) (direct current (DC) resistivity and induced polarization (IP)) [1][2][3]. This technique produces two parameters, namely resistivity and chargeability, which quite well distinguishes the mineral deposit content in rocks [4][5][6]. The DCIP technique has demonstrated to be a useful and effective tool in the exploration of mineral resources (metallic and non-metallic) [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Geoelectrical tomography data processing and interpretation for Pb-Zn-Ag mineral exploration in Nash Creek, Canada

et al. 2020

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The geoelectrical tomography survey was carried out to explore and characterize a (Zn-Pb-Ag) sulphide deposit in Nash Creek (NC), New Brunswick province, Canada. The exploration strategy has been conducted by the 2-D survey for a well-cut grid consisting of twelve surface lines (profiles) each around 2 km long, and 300 m apart, for the total area around 9.5 km2. The datasets (resistivity and induced polarization) were acquired using the Iris El-Rec Pro system with pole-dipole electrodes array spaced 50 m apart, and ten levels of data datum. The results of the 2-D inversion revealed that the underground resistivity and chargeability values in the exploration area have a range of (5 to 1300 Ωm) and (0-9.5 mV/V), respectively. The sulphide mineralization zones in the exploration area are characterized by moderate resistivity values (150-300 Ωm) and moderate to low chargeability values (>5.5 mV/V), with a depth of around (90140 m) from the surface. The 3-D visualization model clearly reveals that three main zones of sulphide mineralization are present in the exploration area. The predicted geological reserve of the sulphide ore in the exploration area was calculated. The inverted models revealed a good agreement with the existing geological features in the exploration area.

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Geophysical Characterization of a Potentially Mineralized Target in Copper Sulfides in the Northwest Limit of Camaquã Basin, Brazil

Pereira

Moreira

Ferreira

et al. 2021

Pure Appl. Geophys.

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Recognition of Sulfides Zones in Marble Mine Through Comparative Analysis of Electrical Tomography Arrangements

Cited by 8 publications

References 23 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)

Geoelectrical tomography data processing and interpretation for Pb-Zn-Ag mineral exploration in Nash Creek, Canada

Geophysical Characterization of a Potentially Mineralized Target in Copper Sulfides in the Northwest Limit of Camaquã Basin, Brazil

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