Induced polarization with in-loop transient electromagnetic soundings: A case study of mineral discrimination at El Arco porphyry copper, Mexico

Flores, Carlos; Peralta-Ortega, Sergio A.

doi:10.1016/j.jappgeo.2009.03.009

Cited by 42 publications

(13 citation statements)

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“…There are several different geophysical methods for mineral exploration; therefore, the selection of geophysical method(s) depends on the physical properties of the exploration target and its accompanied rocks, geological and topographical conditions (e.g., Sultan et al 2009;Ramazi and Mostafaei 2013;Gurin et al 2015;Zhang et al 2018). Integration of induced polarization (IP) and electrical resistivity (ER) is the best selection for copper mineralization exploration (e.g., Chen and Tsao 2001;Flores and Peralta-Ortega 2009;Mamo 2013;Ferdows and Ramazi 2015a;Mashhadi and Ramazi 2018;. IP and ER methods are among the most applicable geophysical methods used in subsurface studies notably for selection of the best drilling points for exploration purposes (Bishop and Emerson 1999;Wynn and Grosz 2000;Ferdows and Ramazi 2015b;Hope and Andersson 2016).…”

Section: Figurementioning

confidence: 99%

“…). Integration of induced polarization (IP) and electrical resistivity (ER) is the best selection for copper mineralization exploration (e.g., Chen and Tsao ; Flores and Peralta‐Ortega ; Mamo ; Ferdows and Ramazi ; Mashhadi and Ramazi ; Mostafaei and Ramazi ). IP and ER methods are among the most applicable geophysical methods used in subsurface studies notably for selection of the best drilling points for exploration purposes (Bishop and Emerson ; Wynn and Grosz ; Ferdows and Ramazi ; Hope and Andersson ).…”

Section: Introductionmentioning

confidence: 99%

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Investigating the applicability of induced polarization method in ore modelling and drilling optimization: a case study from Abassabad, Iran

Mostafaei

Ramazi

2019

Near Surface Geophysics

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The main issue in mineral exploration is to obtain as much information as possible in a time‐ and cost‐efficient manner. This may be achieved through a combination of geophysical methods including the induced polarization method. The induced polarization is the most applicable method in case of metal exploration through drilling. We argue that the relationship between induced polarization, electrical resistivity and ore grade data may be used in resource estimation. This argument is tested in the active copper mine of Madan Bozorg, Abassabad, which is located in the Miami‐Sabzevar mineralization belt in NW Iran. Within the borehole locations, geophysical profiles of induced polarization and electrical resistivity were designed and surveyed using combined resistivity sounding and profiling array. Two‐dimensional models of induced polarization and electrical resistivity were prepared through inversion of geophysical data, after the primary processing. The three‐dimensional block models of induced polarization and electrical resistivity were also compiled using geostatistical methods. Obtained two‐dimensional and three‐dimensional models of induced polarization and electrical resistivity were checked using exploratory boreholes to investigate the relationship among induced polarization, electrical resistivity and copper grade. The three‐dimensional block model of the copper ore was prepared using cokriging and artificial neural network, using a combination of induced polarization and drilling data. In the cases where borehole data were unavailable, the presence of copper ore was predicted by artificial neural network and cokriging methods, and the three‐dimensional models of ore body were constructed in all of the study area. Obtained models based on the predicted copper ore distribution were checked and compared with ore distribution model compiled using drilling data. The results indicate a good agreement between predicted and real results. This led to reduction of borehole number to about 45% and the optimization of boreholes locations. Finally, an optimized drilling plan has been prepared and presented for the Abassabad copper mine.

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating the applicability of induced polarization method in ore modelling and drilling optimization: a case study from Abassabad, Iran

Mostafaei

Ramazi

2019

Near Surface Geophysics

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“…Beran and Oldenburg (2008) solved an inverse problem but were unable to determine which layer is polarizable. In a ground study, Flores and Peralta-Ortega (2009) showed that porphyry deposits can be outlined with IP parameters derived from TEM data. Thus, it is possible that this could be achieved also with airborne data in some cases.…”

Section: Other Developmentsmentioning

confidence: 99%

Metalliferous mining geophysics — State of the art after a decade in the new millennium

2011

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Mining exploration was very active during the first decade of the twenty-first century because there were numerous advances in the science and technology that geophysicists were using for mineral exploration. Development came from different sources: instrumentation improvements, new numerical algorithms, and cross-fertilization with the seismic industry. In gravity, gradiometry kept its promise and is on the cusp of becoming a key technology for mining exploration. In potential-field methods in general, numerous techniques have been developed for automatic interpretation, and 3D inversion schemes came into frequent use. These inversions will have even greater use when geologic constraints can be applied easily. In airborne electromagnetic (EM) methods, the development of time-domain helicopter EM systems changed the industry. In parallel, improvements in EM modeling and interpretation occurred; in particular, the strengths and weaknesses of the various algorithms became better understood. Simpler imaging schemes came into standard use, whereas layered inversion seldom is used in the mining industry today. Improvements in ground EM methods were associated with the development of SQUID technology and distributed-acquisition systems; the latter also impacted ground induced-polarization (IP) methods. Developments in borehole geophysics for mining and exploration were numerous. Borehole logging to measure physical properties received significant interest. Perhaps one reason for that interest was the desire to develop links between geophysical and geologic results, which also is a topic of great importance to mining geologists and geophysicists.

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“…The negative transient values associated with IP in TEM soundings are an intense subject of study in the applied geophysics field since the 1960`s (Walker, 2008). In fact, there are many works in the literature that point the relevance of the IP effect in TEM data associated with negatives decays or, at least, distortions in the TEM response, and how to identify and model it, as can be found in Lee (1975), Spies (1980), Lee (1981), Weidelt, (1982, Smith et al (1988), Smith and West (1988a, 1988b, 1988c, 1988d, Flis et al (1989), Walker, (2008), Flores andPeralta-Ortega, (2009), , Marchant et al, (2012), Yu et al (2013), Marchant et al (2012), Viezzoli et al (2013), , Viezzoli et al (2015), Kwan et al (2015), Kang et al (2015); Kang and Oldeburg (2016, Marco Antonio Couto Junior 2017); ; ; Kwan and Müller (2019), , Viezzoli and Manca (2020). Lee (1975Lee ( , 1981 and Spies (1980) already reported negative transients and pointed out that the IP effect was the possible cause.…”

Section: Valuesmentioning

confidence: 99%

“…During the 1980's and 1990's, much effort was devoted to understand the causes of negatives transients related to the IP effect and how to model it (Spies, 1980, Lee, 1981, Weidelt, 1982, Smith et al 1988, Smith and West, 1988a, 1988b, 1988c, 1988d, Flis et al 1989. During the last 15 years, this topic has come to attention again due the increase in number of HTEM surveys for mineral exploration, which was followed by technological improvements that allowed to identify negative transients more often (Walker, 2008, Flores and Peralta-Ortega, 2009 Marco Antonio Couto Junior al., 2012, Chuan-Tao et al 2013, Marchant et al 2013, Viezzoli et al, 2013, Viezzoli et al 2015, Kwan et al 2015, Kang et al, 2015Viezzoli and Manca, 2018).…”

Section: Introductionmentioning

confidence: 99%

Investigação de Depósitos Auríferos no Quadrilátero Ferrífero, MG, Por Meio da Análise de Dados HTEM

Júnior¹,

Antônio²

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que sempre me apoiaram em todas as minhas iniciativas e esta é mais uma delas.Sobretudo naqueles momentos de sacrifício pessoal necessários para atingirmos nossos objetivos.Agradeço enormemente ao meu orientador Prof. Jorge Luís Porsani por acreditar no meu potencial e incentivar meu embarque no doutorado, além de sempre ter uma palavra amiga, mas realista, quando necessária.Agradeço ao Instituto de Astronomia, Geofísica e Ciências Atmosféricas, seus corpos docente e discente, além do competente quadro de funcionários, por todo o apoio que recebi ao longo da minha trajetória acadêmica que me trouxe até aqui.Agradeço ao Serviço Geológico do Brasil -CPRM por me disponibilizar um período de 2 anos de licença para que pudesse me dedicar integralmente ao meu projeto de doutorado. Um agradecimento especial aos amigos Paulo Henrique Amorim Dias e Joanna Chaves Souto Araújo, por sempre me resgatarem na geologia do Quadrilátero Ferrífero, e a Raphael Ribeiro Severino, pela discussão sobre o MVI. Agradeço ao meu chefe direto, diretor do Centro de Geociências Aplicadas do SGB-CPRM, Noevaldo Araújo Teixeira, por me incentivar e ceder o espaço e tempo necessário para o término da tese.I would like to strongly thank my co-advisor, Esben Auken, for accepting me in the Hydrogeophysics Group for the period of one year in Aarhus during 2018. I am also very thankful to Professors Gianluca Fiandaca and Anders Vest Christiansen, for the great insights about IP effect and TEM method, and for the interest to collaborate in this research. I also thank my colleagues in Aarhus, especially my friends Pradip Maurya, for helping me with Workbench and Lichao Liu, for sharing the office during my period in Aarhus. Also, off course, for grabbing some beers and eat something together at late in the night after a hard day of work.Agradeço à CAPES, pela bolsa de 6 meses para o período sanduíche em Aarhus (processo 88881.188567/2018-01). Agradeço a todos que de forma direta ou indireta me ajudaram no desenvolvimento desta tese. Muito obrigado! ResumoO efeito de IP aéreo (AIP) tem sido tema de grande interesse na comunidade geocientífica internacional, com evidências cada vez maiores sobre sua importância para definir melhor os modelos de resistividade elétrica em levantamentos eletromagnéticos aéreos no domínio do tempo. Suas implicações são significativas no mapeamento geológico e na exploração mineral, em particular, mineralizações em sulfetos metálicos.No entanto, no Brasil, estudos sobre este tema são escassos ou praticamente inexistentes.Nesta pesquisa, abordou-se a aplicação do AIP em dados eletromagnéticos no domínio do tempo voados por helicóptero (Helicopter Transient Electromagnetic -HTEM) sob o Greenstone Belt Rio das Velhas, na região do Quadrilátero Ferrífero (QF), MG. O trabalho focou na modelagem dos dados HTEM considerando-se o efeito AIP e sua potencialidade em identificar zonas favoráveis às mineralizações auríferas. Para isso, utilizou-se um método inovador de reparametrização do modelo de Cole-Cole, denominado ângulo de fase máx...

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Induced polarization with in-loop transient electromagnetic soundings: A case study of mineral discrimination at El Arco porphyry copper, Mexico

Cited by 42 publications

References 28 publications

Investigating the applicability of induced polarization method in ore modelling and drilling optimization: a case study from Abassabad, Iran

Investigating the applicability of induced polarization method in ore modelling and drilling optimization: a case study from Abassabad, Iran

Metalliferous mining geophysics — State of the art after a decade in the new millennium

Investigação de Depósitos Auríferos no Quadrilátero Ferrífero, MG, Por Meio da Análise de Dados HTEM

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