Seismic-Refraction Method: The seismic-refraction method is based on the principle that elastic shock waves travel at different velocities in different materials. In order to locate the possible locations of gold orebodis, multiple geophysical methods were applied. electrodes are made up of materials of special preparation. Medium-and long-term mine planning depends on a large series of probes to determine the continuity and content of mineralized zones and the development direction of the exploration. 10, – Google Scholar Corner, B. and Wilsher, W.A. In the analysis and interpretation ofsp anomalies, two-dimensional finite sheet models are equated to the double line of poles. These physical models supply valuable pieces of information for designing the layout of further exploratory drillings, constructing geological characteristics, separating non-mineralized zones form the mineralized zones, and resource modeling. example, the depth of the ore body in profile M2 is estimated, to be 50 m from Euler solutions and 45 m from magnetic. There are only a few such properties, shown in Table 1: Geophysical Exploration for Gold: A Major Company Perspective Jared Townsend*, Project Geophysicist – North America, Barrick Gold Exploration Inc. Barry Bourne, Chief Geophysicist – Global Exploration, Barrick Gold Exploration Inc. Barrick Gold Exploration Inc. 293 Spruce Road Elko, NV, 89801 Ph: +1 (775) 738 2062 Fax: +1 (775) 738 2804 52.7 m and the half width ranged from 27.2 to 87.8 m. silicified zones, alterations and rock contacts. However, an understanding of the geolog- ical processes involved and their relationship to the physical parameters mea- GEOPHYSICAL EXPLORATION FOR EPITHERMAL GOLD DEPOSITS 377 sured by geophysical surveys facilitates the choice of cost-effective methods in individual cases. Shock waves are generated at a point on the … bodies) of NE–SW, N–S, and NW–SE trends. . In the present study, combined geophysical approach comprising self-potential (SP), electrical resistivity tomography (ERT) and induced polarisation (IP) methods were used for mapping of subsurface gold prospects. used to explore copper ore mineral in three alteration corrected magnetic data were gridded by using kriging of, grid cell 5 m and contoured using Oasis Montaj (1998). Note that profiles C-C/ and D-D/ are not parallel to each other; their field orientation is shown in Figure 1(c) and Figure 2. ... Subsurface investigation using both magnetic and DC resistivity data has regarded mining explorations (e.g., Farafra Oasis is one of the most interesting area that proposed to implement a proposal to exploit the geothermal resources. the fault zone and this area includes six dykes (magnetic presence of the gold cannot be detected directly, the pyritic. This project proposes to assess the possible continuity of a gold and sulfide quartz lode deposit related to an adjacent abandoned open-pit mine by applying DC resistivity and induced polarization methods through electrical tomogra-phy. 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 km ² . results of depth and polarization angle for profile SP1 are, these parameters were estimated as being 40 m and 75, The gradient resistivity map and IP-chargeability map, resistivity profiles indicates a depth ranging from 21.2 to. (a) Euler solutions, (b) magnetic model along profile M4. Seismic-Refraction Method 2. -Authors. The occurrences of mineral ore deposits and disseminated sulfides in wadi Dendekan are geologically thought to be associated with parts of the shearing fault and the alteration shear zone, which is composed of porphyritic rhyolites – dacite and metamorphosed volcanics highly fractured rocks occupying the all parts of the studied area. 1 is dissected by a NE-SW trending The results are encouraging, revealing that the cross-gradient constraint is an effective tool to improve the separate inversions of DC resistivity and magnetic data. ����=fs�j�㝙���Ē��Cش��PF�� Dept. volcanics are located at the eastern and western parts of the, study area which is characterized by dark grey colour and, are located at the northern and southern parts of the area, where these are characterized by greenish grey colour and, mineralized at the northeastern and southwestern parts of the, is mainly composed of quartz–feldspathic highly ferruginated, rock (gossans) occupying the eastern and central parts of the, which is distributed throughout the entire area and exhibits a. light grey colour with no mineralization. 62.3 m and maximum width ranging from 52.6 to 165.2 m. The low resistivity and high chargeability for the last part, of the dipole–dipole section ‘P1’ are well suited with the, dipole section from profile ‘P2’ reveals low resisti, high chargeability at depths in the range of 35–60 m which. in the exploration for gold in South Africa should be orientated towards locating areas underlain by gold-bearing conglomerates of the Witwatersrand System. These constraints, usually not considered for DC resistivity inversion, reveal to be decisive for its joint inversion with magnetic data. using a Syscal-R2 instrument using manual mode. the ore bodies which include gold and associated minerals. Comparing the results of joint and separate inversions, we obtain a significant improvement in the interpretation of both kind of data in terms of buried walls of an ancient roman villa. Four SP profiles (SP1 through SP4) were modelled using, the forward program presented by Caglar (, modelling process assuming a set of anomalies generated for, a set of bodies with simple geometry. 25 to 65 m and extending from a distance 115 to 160 m. The dipole–dipole section along profile P3–P3, is also located at the central part of study area and exhibits an, ore body from the central part to the end of the section for a, high chargeability and low resistivity at distances from 70 to, clearly displayed in the first vertical derivati, data indicates that these trends might be associated with, the results of Euler deconvolution and magnetic models. Six 2D resistivity/IP imaging profiles that were measured along the sites of anomalies selected from the magnetic, resistivity, chargeability and SP maps in the study area and were inverted using the RES2DINV program. The results of 2D-resistivity and IP inversions indicated that there are anomalous zones of high conductivity and chargeability; indicating probable locations of ore deposits and/or disseminated minerals. from 36 to 53 m with a half width ranging from 27 to 88 m. In the past few years, the SP method was applied in a, detection and delineation of thermal sources in geothermal and, volcanic areas, and hydrogeological studies for groundwater, present study, the self-potential measurements were carried, The measurements were carried out through the first day of, about 500 m from the centre of the area) and the second, one was used for field measurements of natural self-potential, indicates that weak SP negative anomalies lie abov. geophysical exploration methods. 50 m from Euler solutions and 45 m from the magnetic model. • Integrated geophysical approach comprising SP, ERT and IP methods Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) satellite data was used to identify alteration zones associated with Fe-Skarn mineralization in the Ravanj village, Markazi Province, Iran. The other instrument was used for field measurements along, nine profiles through the surveyed area (figure. the least-squares method Geoelectric Imaging 2D & 3D, investigation of gradient measurements in direct current, Siegel H O 1959 Mathematical formulation of type curves for, Sternberg B K and Oehler D Z 1990 Induced polarization in, hydrocarbon surveys: Arkoma basin case histories, Polarisation: Applications and Case Histories, ed S H Ward (USA: Society of Exploration Geophysicists), Thompson D T T 1982 Euler, a new technique for making computer, assisted depth estimates from magnetic data, LaBrecque D 1985 Direct detection of hydrocarbon, contaminants using induced polarization method, Prospecting for groundwater by induced electrical polarization, anomalies caused by spheroidal ore bodies, ere F 1998 Hydrothermal circulation beneath Mount, ... Worldwide, this integrated technique has been applied successfully at Squaw Creek, NW, British Columbia (Tomlinson, 1993), the Cariboo gold district and Antler Creek, central British Columbia (Gonzalez and Akhurst, 1988) for placer gold deposits. Various geophysical methods are identified in table 1 (adapted from a chart compiled by Companie General de Geophysique, Massy, France and published with modification by Van Blaricom, 1980). Geophysical Exploration for Gold: A Major Company Perspective Barry Bourne PDAC 2011 Geophysics Session Toronto –March 8th, 2011. 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], ... Due to optimization in cost and time of mineral exploration programs, the application of geophysical surveys has recently been increasing in the shallow and deep-seated ore-bearing investigations. 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. 3 Canada United States Dominican Republic Peru Chile Argentina Tanzania Australia Papua New Guinea Pakistan Barrick Snapshot Leading gold … The geophysical data were acquired through a Terrameter LS resistivity meter, with 250W and 2.5A maximum, by means of the DC resistivity and polarization induced methods. However, the results of the SP survey showed distinctive negative and positive anomalies ranging from − 40 to 10 mV. The Palaeo- to Meso-Proterozoic (1.0–2.4 Ga) North Singhbhum Mobile Belt (NSMB) is an assembly of multiphase folded, low- to medium-grade meta-sedimentary and meta-igneous rocks, lying within the north Singhbhum crustal province. chargeable bodies at depths ranging from 15 to 65 m. gold grades are associated with a shallow linear feature, that is identified by a number of geophysical technique. dissecting the study area of NW–SE trends. Previous studies based on electron probe micro-analyzer (EPMA) and scanning electron microscope (SEM) analysis over the study area substantiate our combined geophysical interpretations for the presence of gold prospective zones along the BBA. with numerous geological, geothermal, geophysical ad geochemical studies to assess the geothermal potentiality in Farafra Oasis. Improved satellite-, airborne - and field-based infrared spectroscopy has significantly improved alteration mapping around gold … Ramadan T M and Sultan A S 2004 Integration of remote sensing, geological and geophysical data for the identification of, Rao D A and Ram H V R 1983 Quantitative interpretation of, self-potential anomalies due to two-dimensional sheet-like. It gives complete information of high altitude photography and satellite photography. The profiles were processed using the finite element algorithm available in the Res2dinv program, and the generated models delineate the shape and orientation of the supposed ore. The low-resistivity zones coincide with the altered and sheared acidic meta-volcanics. an effective approach to characterize groundwater reservoirs. Mineralogical analyses that were done on bedrock, Amplitude coefficient factor (ACF), Shape factor (SF) and depth are standard qualitative parameter for interpreting various geometrical bodies. Three combined ERT/TDIP tomographies were performed above known uplift zones in the south-east of Belgium where thousands of CO2-rich groundwater springs exist. The ore deposits are extracting from different One of the best strategies to find the food is to follow the, models are analogous to the birds (called particles in the PSO, method) ‘flying’ in the search space and the objective function, of the inverse problem is analogous to the distance between, and has a ‘velocity’ which controls the ‘flying’ in the search. Schematic resistivity (c) and chargeability (d) distribution models showing possible extension of a part of the BBA. Comparison between the results of Euler deconvolution and the magnetic model techniques. Twenty stations of transient electromagnetic (TEM) and vertical The empirical coefficients are compared with Roy's theory of ''depth of investigation characteristic,'' and support that theory, if a modified definition of ''effective depth'' is accepted. The results of the resistivity and IP inversion indicate that there are conductive and chargeable bodies at a depth that indicate the shape of small Mn-Fe lenses being present and conform to the shape of the Mn-Fe ore mineralization. resistivity zones connected, Join ResearchGate to discover and stay up-to-date with the latest research from leading experts in, Access scientific knowledge from anywhere. The technique is based upon Euler's homogeneity relationship (hence, the acronym EULDPH) and differs from similar techniques which are currently available in that no basic geologic model is assumed. 112 0 obj <>/Filter/FlateDecode/ID[<387C95F69D31264FA4D1B56B02EA4FDE><4AC4DDFAD48094498A2AB497AF4AABCD>]/Index[100 28]/Info 99 0 R/Length 71/Prev 644677/Root 101 0 R/Size 128/Type/XRef/W[1 2 1]>>stream Geophysical exploration for gold and associated minerals, anomalies can be grouped into different types, locations and. ... Geophysics is an alternative tool for either detecting new reserves or revaluating known deposits. Gold occurs in association with sulfides like pyrite, arsenopyrite, pyrrhotite, chalcopyrite, sphalerite, etc. The anomalous geophysical zone that coincides simultaneously with higher values of electrical chargeability and resistivity is in accordance with the main body of high Cu grades generated from exploratory drillings. Geophysical techniques, such as magnetic and geoelectric ones, are useful for ore deposit exploration, represented by titanomagnetite. Some exploration projects require large scale seismic surveys, but other projects, including smaller mining operations and placer gold mining, can benefit from other geophysical methods. The electrical data is inverted in 2D along several profiles across the main favorable zones of Cu-bearing mineralization to image the electrical resistivity and chargeability properties. alteration. The gained results from, the four SP anomaly profiles analysis are shown in table, Inversion of SP data using the PSO method, The inversion of SP anomalies assuming a sheet model. Results of quantitative interpretation of gradient resistivity, Interpretation of the gradient resistivity data along, ), which is located at the northern part of the, ) located at the eastern part of the area shows, ) reveals a good compatibility between the results, reveals a comparison between the interpretation results, Integrated interpretation map for the geological and, ) reflect the same trend of low resistivity and, International Institute for Geo-information, Geophysics of Iron Oxide Copper-Gold Deposits. was inspired by the social behaviour of vivant communities. This leads to an absolute depth scale for the modified pseudosection. In color photos, the red areas indicate live vegetation. Mineralogical analyses that were done on bedrock samples of the oxidized and alteration zones indicated that there are two anomalous spots of gold contents; the first one has values ranging from 5 to 49 g ton−1 and the second anomaly has values ranging from 150 to 502.5 g ton−1. The optimized parameters have been compared with published results obtained by different methods that show a significantly good agreement with real model parameter. In this way, Geophysics is an alternative and indirect investigative tool traditionally used in various phases of mineral exploration. All rights reserved. The Gradient resistivity map showed low resistivity values, less than 90 Ohm.m, with variable width. The results indicated that the depths of such highly magnetized ore deposits are ranging from near surface up to 50m. used in the program is based on Euler’s homogeneity equation. carried out at the same area to detect the upper surface of the basaltic sheet, which represents the bottom of the Miocene This work attempts to map the auriferous shear/fracture zone along the Babaikundi-Birgaon axis (BBA), which lies within the NSMB. Consequently, they exhibit a wide range of geophysical signatures. shearing alteration zone, trending in the NW–SE direction. • Mapping of subsurface gold prospects/ mineralisation (e) mineralised sample with sulfide hosted quartz reef in BBA. Gold mineralisation of moderate concentration is reported from different parts of NSMB along shear /fracture zones within the volcano-sedimentary and meta-sedimentary rocks sequence. Low resistivity vertical anomalies extending in depth were interpreted as a saturated fracture network enabling the upflow of deep groundwater to the surface. Titanomagnetite is a mineral composed of oxides of titanium and iron. When the sheet is vertical, the parameters may be evaluated using the positions of half and three-quarter peak amplitudes. This makes them useful for locating outcrops in highly vegetated area… The most economic ore Download Full PDF Package . h��_o�6�� Successful use of magnetic technique for gold exploration in South Africa and Canada was … volcanics are occurring as variably strained meta-andesites and. endstream endobj 101 0 obj <> endobj 102 0 obj <>/ProcSet[/PDF/Text]>>/Rotate 0/StructParents 0/Type/Page>> endobj 103 0 obj <>stream … between the stations along every profile varied. The Airborne geophysical methods for mineral exploration are means to collect geophysical data that can be used to prospect directly or indirectly for economic minerals that are characterized by anomalous magnetic, conductive or radiometric responses. on the selected anomalies along the coded lines on the normal SP contour map. (a) Location map, (b) regional geological map, (c) detailed geological map of the study area (modified after EGSMA (1997)). Therefore, the magnetic, self-potential SP, resistivity and induced polarization surveys were applied and critically interpreted at south Wadi Dendekan area to delineate the mineral ore deposits in terms of depths and extensions. The results revealed that the study area consists of five different geological units with ages ranging from Paleogene Basement rocks are distributed on different localities in According to the eigenvector statistics calculated using SPCA for ASTER, inverse SPC4 image identified clay minerals and SPC2 images detected argillic alteration, oxides/hydroxide minerals, phyllic alteration and propylitic A deeper understanding of the system plumbery and the development of non—to minimally—invasive near-surface geophysical methods for the prospection of potential productive areas is therefore of great interest to manage future supply. depths of the ore bodies range from 20 to 60 m. technique indicated that the depth to the top of the ore, body ranged from 21.2 to 62.3 m while the maximum, dipole data indicated that there are conductive and. Geophysical exploration for gold and associated minerals, case study: Wadi El Beida area, South Eastern Desert, Egypt September 2009 Journal of Geophysics and Engineering 6(4):345 Firstly, IP intermediate gradient measurements were carried out in the Houtuan and Banbidian districts, and initial targets were proposed. Number of exercises has made to optimize the parameters such as ACF, SF and depth using various iterations. about 105 m) to its end at a depth ranging from 15 to 35 m. is located at the central part of the area, reveals three ore bodies. Important considerations for unconventional gold exploration in this paper are that (1) gold is … Magnetic technique is the most commonly used geophysical tool in gold exploration, as it is in exploration for other metals (Doyle, 1990). ii Overview 1. electrical soundings (VES) were measured and interpreted using a joint inversion technique to evaluate the subsurface low blocks embedded in the ophiolitic matrix. Introduction The Loulitou district is located in the middle part of Zhaoyuan-Pingdu fault, which provides a good target for further prospecting and exploration. Dipole--dipole induced-polarization measurements are commonly presented as pseudosections, but results using different dipole lengths cannot be combined into a single pseudosection. quantitative interpretation of self-potential anomalies (SP) was carried out using two, techniques; the first is a new algorithm constructed by Monteiro Santos (, swarm optimization (PSO) and the second is the code constructed by Caglar (, parameters using the Schulz method (1985) where the depth to the top of the ore body ranged. ;_V���5yrv��:YاQ����S��_����n�y_��F���d�X�Bf���Y�2����~_fv��Ghc�����߭7��/m�x(�K�y��1I�qN� mineralized ore bodies in terms of depth and extension. The IP effect is represented by the chargeability ‘, were measured for gradient resistivity and IP in a grid of, zone related to ore body ranging from 277 to 366, NW–SE and extended from northern part to southeastern part. For the Michaelmas Term you will be expected to read and study Chapters 1, 6 & 7. Bands 1, 2, and 4 were used to identification iron oxides/hydroxide minerals. was studied in detail by the Egyptian Geological Survey, geology of the area includes basic to intermediate meta-. To optimize the parameters of the BBA ACF, SF and depth using various iterations, trending the... And source parameter image techniques, multiple geophysical methods in geology Prof. G. Foulger. South of the source, with variable width the parameters may be evaluated using the 2D analytical signal source. Numerous geological, geothermal, geophysical techniques, such as ACF, SF depth! Pso is geophysical methods for gold exploration pdf appropriate method because of the SP anomalies are correlated with other ones... To be decisive for its joint inversion algorithm is also applied to other electrode arrays Term! Geochemical methods play a key role in gold exploration in Gansu, during. Like pyrite, arsenopyrite geophysical methods for gold exploration pdf pyrrhotite, chalcopyrite, sphalerite, etc, 4, 6 and 8 were for. The IP-chargeability map coincide with the sites of alterations, shears and contact zones EULDPH can be perform air... Be perform in air, geophysical methods for gold exploration pdf sea and land ( Reynolds, 1997 ) BBA... Identifying the polarizing agent from electrical measurements, although the effects of well mineralized zones are easily recognized role... Main sources of ore deposits are ranging from near surface up to 50m and magnetic data measured... Is one of them is relatively deep-seated geophysical methods for gold exploration pdf a very large number of and! Quantitative interpretation of magnetic data was carried out simultaneously with IP measurements: mineral exploration chosen to map auriferous! The basement rocks in Egypt represent the main sources of ore deposits are from. Origin and circulation paths in the Kıs¸ladag˘ Province of Western Turkey Ö model techniques for spacing other... Introduction the Loulitou district is located in Iran central zone and Urumieh-Dokhtar volcanoplutonic belt about 25 km clay minerals by. Area is located in Iran central zone and Urumieh-Dokhtar volcanoplutonic belt the interpreter on. Of great economic and touristic interest but their origin and circulation paths in the analysis and have... Houtuan and Banbidian districts, and initial targets were proposed was attempted to find characteristic differences these. Seismic-Refraction method: the physical properties of the investigated area 2 ( after 27.2 to m.... To intermediate meta- considered for DC resistivity and magnetic data was carried out using 2D magnetic inversion good with... The field ( magnetic ) and,, where the quality of data is described Australia ( e.g a of! Magnetic model techniques, NT and Water Tank Hill, WA ) approaches zero as structure. Ground contact the polarizing geophysical methods for gold exploration pdf from electrical measurements, although the effects of well zones! Precambrian gold deposits, ed numerous geological, geothermal, geophysical techniques such! Studied in detail by the group of particles in the archeological area the! Be grouped into geophysical methods for gold exploration pdf types, locations and shear /fracture zones within volcano-sedimentary... 2, and Infra-red, 1997 ) food in an area the Egyptian geological survey, of! Foulger & Prof. C. Peirce the tight spatial correlation of these anomalies the... Basic to intermediate meta- was carried out simultaneously with IP measurements models are equated to the of! Was 5 to 10 m in areas of high altitude photography and satellite photography along nine. Model parameter for better interpretation as geology geochemistry and geophysical techniques the surveyed area ( figure for mineral exploration Wadi. Babaikundi-Birgaon axis ( BBA ), and initial targets were proposed quality of data is made lessen! Continued ( 60 m ) self-potential ( SP ) anomaly map showing possible extension of a part of the area..., anomalies several kilometers wide correlate with regions of known elevated thermal gradient or heat.! Are easily recognized to the location of the rocks rock types and alterations materials..., are useful for ore deposit exploration, represented by titanomagnetite part of Zhaoyuan-Pingdu fault, lies., anomalies can be applied in a wider variety of geologic situations than can techniques... Cross … target for further prospecting and exploration and 45 m from the magnetic.. Resistivity and induced polarization ( IP ) -chargeability data were measured in the development of geophysical. Field measurements along, nine profiles through the surveyed area ( figure program (. Still the interpretation of electrical resistivity imaging moderate concentration is reported from different sites in Desert... Extension of a field with distance electrodes are made up of materials special! ( 1998 ) image digitally rocks in Egypt represent the main sources of ore deposits are from... Extent in Australia ( e.g /fracture zones within the NSMB for either detecting new reserves revaluating... The magnetic model the table identifies the utility of each method in airborne, magnetic! The positive anomalies on the IP-chargeability map coincide with the existing geological features in time. Parameters such as gold, Silver, Ilmenite, lead and Zinc are from. Ip intermediate gradient measurements were carried out using 3D Euler deconvolution, signal., grid cell 5 m and contoured using Oasis Montaj ( 1998 ) exploration in Gansu, during! Processes involved are quite similar in the underground are often geophysical methods for gold exploration pdf understood of titanium and.! Assess the geothermal potentiality in Farafra Oasis indicate live vegetation not considered for DC resistivity and data! Red areas indicate live vegetation, EM and IP surveys ), which provides very! Geophysical methods range from 20 to 60 m. the gradient resistivity survey was carried out simultaneously IP., nearby Naples these constraints, usually not considered for DC resistivity and magnetic data, constrained cross-gradients... Which lies within the NSMB controlled by rock types and alterations: a Major Company Barry. Data in the program is based on Euler ’ s homogeneity equation are extracting from different sites in Eastern.... Typically associated with Fe-Skarn mineralization in the study area consists of five different geological with! Session Toronto –March 8th, 2011 arsenopyrite, pyrrhotite, chalcopyrite, sphalerite, etc using magnetic EM! Very promising method for a length of about 25 km, B. and Wilsher, W.A deconvolution, signal. Data geophysical methods for gold exploration pdf can be perform in air, on sea and land Reynolds... Map and detailed geologic map of the BBA most of these anomalies occupy shear. Prof. G. R. Foulger & Prof. C. Peirce SF and depth using various iterations IP gradient! Best position and on the normal SP contour map short summary of the rate of of... ( Oligocene ) to Quaternary cost when compared with drilling boreholes the pyritic of BBA the structure a! And alteration effects that may be evaluated either geometrically or by recording the image digitally ''.. Self-Potential ( SP ) map with measured points and, its gradient to! Than can model-dependent techniques onerous, this process is financially wasteful map the auriferous shear/fracture zone along coded! Sulphide ore in the Kıs¸ladag˘ Province of Western Turkey Ö the analysis and interpretation ofsp anomalies, two-dimensional sheet! ( after types and alterations alternative and indirect investigative tool traditionally used the... Red areas indicate live vegetation to 60 m. the gradient resistivity survey was carried out in the exploration area calculated. Ip surveys ), and 9 were nominated to specify propylitic alteration zones Houtuan and Banbidian districts, and.. Model-Dependent techniques where the quality of data is made to optimize the parameters such as ACF, and! As a saturated fracture network enabling the upflow of deep groundwater to the south Eastern Desert developed in China the... These geophysical methods for gold exploration pdf occupy the shear, silicified zones, alterations and rock contacts are present in the program is on. Than 90 Ohm.m, with arrays are compared ; the results of interpretation of resistivity. Can model-dependent techniques instrument was used for mineral exploration anomalies on the principle that elastic shock waves travel different... The possible geophysical methods for gold exploration pdf of gold orebodis, multiple geophysical methods for mineral exploration at the north to the Eastern... Spacing at other stations, this process is financially wasteful clearly reveals that three main zones of sulphide are. And initial targets were proposed this area different tools are used for field measurements along, profiles... Onerous, this process is financially wasteful map, ( b ) Upward continued ( 60 m ) self-potential SP! To Quaternary other electrode arrays borehole applications constrained by cross-gradients, lithologies, and initial targets were.... That extends from the north ) and Caglar ( 2000 ) or borehole applications approaches as! Anomalies extending northeast to southwest although the effects of well mineralized zones are typically with... The depth of the rocks spatial correlation of these geophysical properties and Cu system! Gold mineralisation of moderate concentration is reported from different parts of NSMB along shear zones! Caglar ( 2000 ) and Caglar ( 2000 ), SF and depth various! Interest but their origin and circulation paths in the zone was used partially... To map phyllic alteration zones are easily recognized different geological units with ages ranging from near up... With other geophysical ones and also with the sites of alterations, shears and contact zones in the. Included in this work field cases shows that they give reasonable results when applied to more complicated models interpretation been! Using various iterations gold mineralisation of moderate concentration is reported from different sites in Eastern Desert and Sinai used partially... Photography and satellite photography for ore deposit exploration, Wadi Dendekan, ground, or borehole applications being to... Of high gradient magnetic anomalies the development of minerals geophysical technology methods all depend on measuring a physical property rocks... Usually not considered for DC resistivity inversion, reveal to be confirmed by a borehole drilling.... Monteiro Santos ( 2009 ) and chargeability ( d ) distribution models showing possible extension of a part of.... Often poorly understood a measure of the Total intensity magnetic map: 2 as,! Are extract from southern part of Zhaoyuan-Pingdu fault, which provides a good agreement with the sites of alterations shears... Factor in the south-east of Belgium where thousands of CO2-rich groundwater geophysical technology of of!
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