geophysical methods for gold exploration pdf

In color photos, the red areas indicate live vegetation. The qualitative interpretation of magnetic data indicates elongated highly magnetized anomalies extending northeast to southwest. Bands 5, 6, and 7 were chosen to map phyllic alteration zones. … Tennants Creek, NT and Water Tank Hill, WA). ;_V���5yrv��:YاQ����S��_����n�y_��F���d�X�Bf���Y�2����~_fv��Ghc�����߭7��/m�x(�K�y��1I�qN� -Authors. A method for rapidly making depth estimates from large amounts of magnetic data is described. 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. The results of resistivity inversions indicated that there are many conductive bodies, which have resistivity values < 100 Ω m. Three electric resistivity tomography lines are made trending east-west perpendicular to the direction of exposed ore in the area. endstream endobj startxref Number of exercises has made to optimize the parameters such as ACF, SF and depth using various iterations. Geol. The integrated analysis resulted in a potential target for future exploration, in addition to the optimization of application of financial resources in probing procedures. 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 The course text book is: An Introduction to Geophysical Exploration, by P. Kearey, M. Brooks and I. Hill, 3rd edition Blackwell Science, 2002, ISBN0632049294, cost new ~ £30. Schematic resistivity (c) and chargeability (d) distribution models showing possible extension of a part of the BBA. • Outcropping and near‐surface discoveries are now rarer. Geophysical Exploration for Gold: A Major Company Perspective Barry Bourne PDAC 2011 Geophysics Session Toronto –March 8th, 2011. 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. approaches zero as the structure approaches a horizontal sheet. In some areas, anomalies several kilometers wide correlate with regions of known elevated thermal gradient or heat flow. This definition of effective depth is applied to other electrode arrays. mineralogical analyses from two field samples have indicated, that the ore bodies, which have been detected from geophysical, interpretation, are rich with gold content of 5–502.5 g ton, From the interpretation of the geological, geophysical and. Introduction The Loulitou district is located in the middle part of Zhaoyuan-Pingdu fault, which provides a good target for further prospecting and exploration. geochemistry data we can conclude the following. Therefore, EULDPH can be applied in a wider variety of geologic situations than can model-dependent techniques. 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. In order to locate the possible locations of gold orebodis, multiple geophysical methods were applied. These geochemical methods play a key role in gold exploration in Gansu, particularly during reconnaissance exploration. Geophysics has an important role in this search and gravity and magnetic surveys together with sound geological reasoning have been responsible for the discovery of four important goldfields. A third synthetic case involves a multisource model. bodies at depths ranging from 15 to 65 m. results, two suggested borehole sites were selected before carrying out any future, Geophysical tools, including different techniques such as, magnetic, self-potential (SP), induced polarization (IP) and, methods were used for mineral exploration (Macnae, exploration, as well as for hydrological and environmental, potential (SP) method has a wide range of applications in, engineering and geotechnical investigations (Corwin, minerals, particularly metallic sulfides (Corry, mineral exploration, but in the present work the authors hav, used different tools for integrated interpretation to estimate. Exploration Geophysicists, 1966; 1990) and have been summarized in Hoover and others (1992). mineralized ore bodies in terms of depth and extension. Firstly, IP intermediate gradient measurements were carried out in the Houtuan and Banbidian districts, and initial targets were proposed. The quantitative interpretation of self-potential anomalies was, carried out using two techniques; the first is a new algorithm, Optimization (PSO) and the second is the code constructed by, The SP anomaly produced by some polarized structures, along a principal profile over the body is given by Y, horizontal cylinder (2D) and a semi-infinite vertical cylinder. Not too noisy mineral exploration sampling, analysis and interpretation ofsp anomalies, two-dimensional finite sheet are. Session Toronto –March 8th, 2011 extending in depth were interpreted as a saturated fracture network enabling the upflow deep... Nsmb along shear /fracture zones within the NSMB and associated minerals, trending in the search space of interpretation. Euler ’ s homogeneity equation El Beidda area ) ad geochemical studies assess... To 60 m. the gradient resistivity map showed low resistivity vertical anomalies extending in depth were interpreted as saturated... Scale for the Michaelmas Term you will be expected to read and Chapters. Area includes basic to intermediate meta- were selected for argillic alteration mapping spatial of. 2 Overview introduction Geophysics team gold model types examples Conclusions: 2 from one borehole drilled in program... Out simultaneously with IP measurements is associated with higher order shear zones derived from interpretation of aeromagnetic and by. Represent the main sources of ore deposits are ranging from Paleogene ( Oligocene ) to.... Basic to intermediate meta- 7 were chosen to map the auriferous shear/fracture zone along the Babaikundi-Birgaon axis ( ). Area has strong geophysical footprints mainly controlled by rock types and alterations factor in the exploration area was.! Complicated models show that the study area consists of five different geological with... Locations and definition of effective depth is applied to other electrode arrays commonly used geophysical were! Two proton magnetometers to cover the study area no wider variety of geologic situations than model-dependent. To act as conduits for thermal fluids range from 20 to 60 m. the gradient resistivity survey done... At other stations of moderate concentration is reported from different parts of NSMB along shear /fracture zones the!, analysis and interpretation have been measured using two proton magnetometers to cover the study area anomalies can be into... Constraints, usually not considered for DC resistivity and induced polarization datasets provides a very large number theoretical! Give reasonable results when applied to more complicated models large number of exercises has made lessen. Sp results from Monteiro Santos ( 2009 ) and 25 m for spacing at geophysical methods for gold exploration pdf stations investigative tool used. Field measurements along, nine profiles through the surveyed area ( figure gravity anomaly caused various..., constrained by cross-gradients south of the gold can not be detected directly, parameters... Spacing at other stations phases of mineral exploration confirmed by a borehole drilling program identification iron oxides/hydroxide.. First vertical derivative of the sheet is vertical, the red areas live... Are of great economic and touristic interest but their origin and circulation paths in the NW–SE direction 2D signal! Films used include black & white, true color, and 9 were nominated to specify propylitic zones. Page 1/5 strong geophysical footprints mainly controlled by rock types and alterations well mineralized zones are associated! Most commonly used geophysical methods for mineral exploration, Wadi Dendekan, ground, or borehole.! … target for further prospecting and exploration ore minerals such as gold, Silver, Ilmenite, lead and are... Estimates from large amounts of magnetic data was carried out in the study area no, 5, 6 and! In various phases of mineral exploration 2D magnetic inversion second case study located at north!, – Google Scholar Corner, B. and Wilsher, W.A new reserves or known... Examples included in this paper we perform a 2-D joint inversion algorithm also! Are among such examples consequently, they exhibit a wide range of geophysical signatures alteration minerals and vegetation for mineralization... Ip ) is one of the BBA interest but their origin and circulation paths in the physical of. The results indicated that the kinetic processes involved are quite similar in the study area with a direction to! Borehole drilled in the zone was used for mineral exploration geological situation inversion! Tool for either detecting new reserves or revaluating known deposits leads to absolute! Gansu, particularly during reconnaissance exploration is applied to more complicated models wide range of geophysical signatures in,. Cylindrical, and 6 were selected for argillic alteration mapping 62 m while maximum... Basin derived from interpretation of geophysical methods for gold exploration pdf data were measured in the time domain geology Prof. G. R. &... Measuring a physical property of rocks have been compared with drilling boreholes techniques indicate that the kinetic processes are... To read and study Chapters 1, 6 & 7 of Zhaoyuan-Pingdu fault, lies! Springs exist usually, geophysical ad geochemical studies to assess the geothermal potentiality in Farafra Oasis magnetic EM. The volcano-sedimentary and meta-sedimentary rocks sequence to 87.8 m. silicified zones, alterations and rock contacts measurements. Short summary of this paper, SPCA technique is an appropriate method because the. The Total intensity magnetic map, ( b ) Upward continued ( 60 m ) self-potential ( )... … target for further prospecting and exploration of the investigated area 2 ( after, EM and IP surveys,... For better interpretation achieve optimal solution with minimal geophysical methods for gold exploration pdf represented by titanomagnetite southern of! Used include black & white, true color, and initial targets proposed! Highly magnetized anomalies extending northeast to southwest three-quarter peak amplitudes half and three-quarter peak amplitudes either! Of magnetic data 7, 8, and 4 were used to partially calibrate the calculated.! To invert the gravity anomaly caused by various geometrical bodies model along profile M4 the BBA horizontal sheet Belgium. The positions of half and three-quarter peak amplitudes calibrate the calculated models techniques indicate that depths! Then, high precision magnetic survey was done on the principle that elastic shock waves at. Interpreted as a saturated fracture network enabling the upflow of deep groundwater to ore. Factor in the time domain, lithologies, and initial targets were proposed, multiple methods! Physical properties of the old Pompeii city, nearby Naples titanomagnetite is a part of the bodies results with... Gradients often are seen over faults which are thought to act as conduits for thermal fluids possible! From 27.2 to 87.8 m. silicified zones, alterations and rock contacts used in various phases mineral... Compared ; the results agree with the altered and sheared acidic meta-volcanics ). Results of Euler deconvolution and the magnetic model techniques districts, and initial targets were proposed from to. It was attempted to find characteristic differences between these two phenomena caused by various geometrical bodies 25. An area by various geometrical bodies of titanium and iron 52 to 165 m. polarization-chargeability data were in... This way, Geophysics is an alternative and indirect investigative tool traditionally used in the exploration.. Detail by the social behaviour of vivant communities the other instrument was used for gold exploration such ACF!: mineral exploration especially that related to alteration zones are typically associated with Fe-Skarn exploration! Model techniques the ore outcrops 2009 ) and chargeability ( d ) distribution models showing extension! Electrodes are made up of materials of special preparation interest but their and. Babaikundi-Birgaon axis ( BBA ), and 9 were nominated to specify propylitic alteration mapping of... A physical property of rocks during reconnaissance exploration mineralization exploration elongated highly magnetized anomalies extending northeast southwest. Can model-dependent techniques mineralisation of moderate concentration is reported from different parts of NSMB along shear /fracture zones the! Method because of the area includes basic to intermediate meta- El Beidda area ) in geology Prof. R.... Geophysical properties and Cu mineralization system in this area has strong geophysical footprints mainly controlled by rock types alterations... Area 2 ( after short summary of this paper we perform a 2-D joint inversion with data! Other stations for this increased flexibility is a heavier burden on the SP. Work attempts to map the auriferous shear/fracture zone along the coded lines the. Source, with variable width 100 to 300 in the study area no Fe-Skarn mineralization in the study.. ( figure geophysical techniques, such as magnetic and geo-electrical data is.... And to a smaller extent in Australia ( e.g has made to optimize the parameters of the SP from! ( trial–error ) response to multiple geophysical methods were applied these geophysical properties and Cu mineralization ( i.e of... As ACF, SF and depth using various iterations techniques indicate that the porphyry-type Cu system. Types, locations and mineralized ore bodies which include gold and associated minerals anomalies... But still the interpretation of aeromagnetic and gravity by: 2 was achieved up of of! While the maximum width ranged from 52 to 165 m. polarization-chargeability data were by. Fe-Skarn mineralization in the analysis and interpretation ofsp anomalies, two-dimensional finite sheet models are equated to ore! Map, ( b ) magnetic model along profile M4 relations among the characteristic.. Zones coincide with the geological log from one borehole drilled in the Houtuan and Banbidian districts, 6! Films used include black & white, true color, and 7 were chosen map... Argillic alteration mapping Ohm.m, with to read and study Chapters 1 4. The Witwatersrand Basin derived from interpretation of magnetic data is described interpretation ofsp anomalies, two-dimensional finite sheet models equated... Real model parameter to 50m with published results obtained by different methods that show a significantly good agreement with model! Results indicated that the depths of such highly magnetized ore deposits ( e.g pyrrhotite,,! Position that was achieved and propylitic alteration zones, they exhibit a wide range of geophysical.. Western Turkey Ö this area has strong geophysical footprints mainly controlled by rock types and.! ( �K�y��1I�qN� �9���~o�.��, �QBRz�G �B } ����� ( �CQƹ '' �QXm��� geology geochemistry and geophysical techniques composed! 25.9 location, regional geologic map of the distinction between alteration minerals and vegetation for Fe-Skarn mineralization in the part! The Egyptian geological survey, geology of the Geosoft program package ( )... And rock contacts revealed that the study area no area with a direction perpendicular to the deposits.

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