Reassessment of Copper Mineral Occurrence Through Electrical Tomography and Pseudo 3D Modeling in Camaquã Sedimentary Basin, Southern Brazil

Moreira, César Augusto; Paes, Renata Augusta Sampaio; Ilha, Lenon Melo

doi:10.1007/s00024-018-2019-2

Cited by 23 publications

(14 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

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

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…After 2D inversion, preparation of 3D model of IP and ER was performed through 3D inversion, but our surveyed data did not require characterizations for 3D inversion according to Gharibi and Bently (2005), Aizebeokhai et al (2011) and Moreira et al (2018). 3D model of IP and ER was constructed using geostatistical methods.…”

Section: D Modellingmentioning

confidence: 99%

“…), copper mineral exploration using 3D model of IP and resistivity in Brazil (Morriera et al . ), investigation of a rock glacier by 3D tomography of IP and ER in France (Duvillard et al . ) and urban area investigation by 3D IP and ER in Stockholm (Pazzi et al .…”

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

View full text Add to dashboard Cite

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.

show abstract

“…Borehole resistivity and chargeability tomography (BHDCIP) can give valuable help to mineral exploration applications, especially with ore-deposits that have thick overburden cover and complex geology. In-hole datasets can supply information on the DCIP signatures of key lithologies and mineralization, hence enabling improved an understanding of which geophysical signature reflects geologic features of interest [8][9][10][11][12]. Off-hole datasets provide information on the spatial extent and the orientation of in-hole features, in addition to identifying off-hole targets.…”

Section: Introductionmentioning

confidence: 99%

Borehole resistivity and induced polarization tomography at the Canadian Shield for Mineral Exploration in north-western Sudbury

et al. 2020

View full text Add to dashboard Cite

Mineral exploration in the Canadian shield is a major challenge nowadays. This is because of the thick overburden cover and complex geology. Borehole tomography using resistivity and induced polarization (BHDCIP) method has a big advantage here due to that the data is acquired underneath the cover and data quality, in general, is superior to that acquired at the surface. BHDCIP provides good resistivity and chargeability data, which can identify mineralization easily. In this study, the BHDCIP survey with high-resolution data was carried out to identify mineralization zones in the McCreedy West zone, north-western Sudbury, Ontario, Canada. Two and three-dimensional (2-D and 3-D) inversion results of three boreholes clearly revealed the mineralization zones and that harmonised with previous geological studies in the study area. The BHDCIP method provided insight and developed an informative subsurface map to identify the mineralization zones, thus proving it as a beneficial tool used for mineral exploration in complex geology with a minimal data survey and an irregular geometrical distribution.

show abstract

Reassessment of Copper Mineral Occurrence Through Electrical Tomography and Pseudo 3D Modeling in Camaquã Sedimentary Basin, Southern Brazil

Cited by 23 publications

References 29 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)

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

Borehole resistivity and induced polarization tomography at the Canadian Shield for Mineral Exploration in north-western Sudbury

Contact Info

Product

Resources

About