Quartz Prospecting With Induced Polarization (Ip) and Resistivity by Using Gradient and Dipole-Dipole Arrays

Gallas, José Domingos Faraco

doi:10.22564/rbgf.v33i4.785

Cited by 3 publications

(2 citation statements)

References 6 publications

(7 reference statements)

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“…IP is widely used in mineral prospecting (Dakir et al, 2019;Dusabemariya, 2020;Gallas, 2000;Gallas, 2015) and rarely in environmental cases (Gallas et al, 2011). The MALM method has been used in specific cases to delimit massive sulphide bodies (Gallas, 2000;Gallas & Birelli, 1983;Bowker, 1991;Daniels, 1983) and even more rarely in environmental cases (e.g., contaminated areas; De Carlo et al, 2013;Ling et al, 2019).…”

Section: Brief History -Malm Casesmentioning

confidence: 99%

Delimitation of massive sulphide bodies – Mise‐à‐la‐masse method associated with induced polarization (IP) – A case history from Brazil

Gallas

2023

Near Surface Geophysics

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This paper presents a successful application of the mise-à-la-masse (MALM) or applied potential method in association with induced polarization (IP). MALM is known, since 1920, to be able to delimit electrically conductive massive mineralization. The method is used at the point where a drill hole intercepts a massive, mineralized body, to estimate its extent and shape. It is thus used as a complementary mineral exploration tool. IP is normally used in conjunction with resistivity. However, the acquisition of IP data together with the MALM method is rarely found in the literature. This survey shows that it is possible to successfully detect and delimit areas of disseminated sulphides using MALM with IP. In this paper, the MALM method is presented and discussed in detail. A short description of the IP method is also provided. Data are from the Camaquã Project (Caçapava do Sul, RS, Brazil) and the Santa Maria (lead, zinc and associated silver) deposit, 5 km south of Caçapava do Sul. In a well that intercepted a massive mineralization (borehole 8011) with electrical continuity, ∆V measurements delineated the extent, shape and orientation (NS) of a conductive sulphide body. Mineralization intercepted by other two wells (8011 and 8103) did not present enough electrical continuity to exhibit potential contours that could be associated to massive sulphides; it was, however, successfully detected by IP.

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Section: Brief History -Malm Casesmentioning

confidence: 99%

Delimitation of massive sulphide bodies – Mise‐à‐la‐masse method associated with induced polarization (IP) – A case history from Brazil

Gallas

2023

Near Surface Geophysics

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“…Sulfide prospecting using geoelectric methods such as electrical resistivity and induced polarization (IP) are highly effective due to the contrast of electrical resistivity and chargeability, in disseminated sulfides or filonean deposits which are characterized by low resistivity and high polarizability (Moon et al, 2006;Kearey et al, 2013). Several geophysical methods show the applicability in the reconnaissance, delimitation and modelling of sulfide mineral occurrences, citing Irvine & Smith (1990), Locke et al (1999), Allis (1990), Moreira & Ilha (2011), Moreira et al (2012), Moreira et al (2016b), (Moreira et al, 2016a), Agnoletto & Leite (2015), Gallas (2015), Côrtes et al (2016), among others.…”

Section: Introductionmentioning

confidence: 99%

Geoelectric Prospection of Copper Occurrence in Folding Layers in the Sul-Riograndense Shield (Brazil)

Santos¹,

Moreira²,

Rosa³

et al. 2018

Braz J Geophys

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Sulfide prospecting with the geophysical methods, such as electrical resistivity and induced polarization, are promising due to the contrast of electrical resistivity and chargeability, where deposits with disseminated sulfides or filoneans are characterized by low resistivity and high polarizability. This work carried out a study of geophysical prospecting by means of tomographic acquisition in mineral copper occurrence, in the region of Caçapava do Sul. Three acquisition lines were performed by means of electrical tomography technique using a Dipole-dipole arrangement, with a length of 400 m and a spacing of 5 m between the electrodes, arranged in perpendicular layout to the structure of the area, represented by a large synclinal where research galleries with carbonates and copper sulfides were recognized in the ridge. The 2D inversion models and 3D multilevel maps indicate central and lateral regions with high resistivity and chargeability with indication of probable presence of copper sulfide, possibly housed in quartz veins. Peripheral zones with moderate resistivity and chargeability infer possible areas with presence of argilization, zones with high chargeability and low resistivity are likely to be zones of sulfation and possible silicification zones with high resistivity and low chargeability, observed in the vicinity of the probable mineralized zones.Keywords: Chargeability, Mineral Research, Resistivity, Sulfide, 3D Multilevel modeling.RESUMO A prospecção de sulfetos por meio de métodos geofísicos de eletrorresistividade e polarização induzida são altamente efetivos devido ao contraste de resistividade elétrica e cargabilidade, uma vez que os depósitos com sulfetos disseminados ou filoneanos são cvaracterizados por baixa resistividade e alta polarizabilidade. Esse trabalho realizou aquisição de tomografia elétricas em ocorrência mineral de cobre, na região de Caçapava do Sul (RS). Foram realizadas 3 linhas de tomografia elétrica em arranjo dipolo-dipolo, com 400 m de comprimento e 5 m de espaçamento entre eletrodos, dispostas de forma perpendicular à crista de um anticlinal, onde no passado foram reconhenhecidos carbonatos e sulfetos de cobre, em galerias de exploração mineral. Os modelos de inversão 2D e mapas de multiníveis 3D indicam regiões centrais e laterais com alta resistividade e alta cargabilidade com provável zona de sulfetos alojados em veios de quartzo. Zonas periféricas com moderada resistividade e cargabilidade sugerem a presença de argilização; zonas com alta cargabilidade e baixa resistividade são prováveis zonas de sulfetação e altos valores de resistividade e baixos de cargabilidade indicam zonas de silicificação.Palavras-chave: Cargabilidade, Pesquisa Mineral, Resistividade Elétrica, Sulfeto, Modelamento Multinível 3D.

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Delineation of Potential Gold Mineralization Zones in the Kushaka Schist Belt, Northcentral Nigeria, Using Geochemical, Ground Magnetic, Induced Polarization, and Electrical Resistivity Methods

Sanusi,

Josiah,

Olaniyan

et al. 2024

Mining, Metallurgy & Exploration

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Quartz Prospecting With Induced Polarization (Ip) and Resistivity by Using Gradient and Dipole-Dipole Arrays

Cited by 3 publications

References 6 publications

Delimitation of massive sulphide bodies – Mise‐à‐la‐masse method associated with induced polarization (IP) – A case history from Brazil

Delimitation of massive sulphide bodies – Mise‐à‐la‐masse method associated with induced polarization (IP) – A case history from Brazil

Geoelectric Prospection of Copper Occurrence in Folding Layers in the Sul-Riograndense Shield (Brazil)

Delineation of Potential Gold Mineralization Zones in the Kushaka Schist Belt, Northcentral Nigeria, Using Geochemical, Ground Magnetic, Induced Polarization, and Electrical Resistivity Methods

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