Line Spacing Effect and Determination of Optimum Spacing Illustrated by Marmora, Ontario Magnetic Anomaly

Agocs, W. B.

doi:10.1190/1.1438197

Cited by 19 publications

(5 citation statements)

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“…Even small graphite deposits occurring at shallow depths are likely to be economic. The average strike length of the known orebodies in this area varies from 50 m to 200 m. The probability of detecting an orebody of 100 m strike length with a traverse spacing of 20 m is 0.936 (Agocs ). It was therefore decided to carry out a systematic SP survey in a grid pattern with a traverse spacing of 20 m and a station interval of 5 m on each traverse.…”

Section: Self‐potential and Mise‐à‐la‐masse Measurementsmentioning

confidence: 99%

Three‐dimensional probability tomography of self‐potential anomalies of graphite and sulphide mineralization in Orissa and Rajasthan, India

Bhattacharya

Shalivahan

Jardani

et al. 2007

Near Surface Geophysics

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International audienceCharge occurrence probability (COP) and dipole occurrence probability (DOP) tomographic imaging of graphite and sulphide orebodies, which were earlier detected by a self-potential (SP) survey, were carried out. Three typical examples, two shallower graphite lenses in Bender and Berni, Orissa State, and one relatively deeper sulphide deposit in Kayar, Rajasthan State, are presented. An exploratory test hole, drilled on the basis of the SP results in Bender and Berni, struck graphite. A mise-à-la-masse survey was also carried out on these two deposits to delineate the orebody. The graphite deposits have subsequently been mined. The shapes of the graphite bodies, especially the upper parts, are now known. The Bender deposit is a single graphite lens, whereas the graphite occurrences in Berni are complex multilens-type deposits. Both the COP and DOP techniques clearly imaged the single lens at Bender, as well as the multilens deposits at Berni. The Kayar sulphide deposit, unlike the graphite deposits, has not yet been mined, and therefore it is not delineated as precisely as the graphite orebodies. However, its outline is known from the drilling data. The imaging results of COP and DOP show good agreement with the drilling results of the sulphide deposits

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Section: Self‐potential and Mise‐à‐la‐masse Measurementsmentioning

confidence: 99%

Three‐dimensional probability tomography of self‐potential anomalies of graphite and sulphide mineralization in Orissa and Rajasthan, India

Bhattacharya

Shalivahan

Jardani

et al. 2007

Near Surface Geophysics

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“…Nowruzi [9] and Ahmadi [10] investigated the theoretical and practical concepts of geometric probabilities and presented the relations of geometric probabilities to determine the probability of the intersection of various geometric shapes with different types of grids (Buffon's needle problem). Agocs [11] was one of the first to study the effect of changing the distance of flight lines and the location of these lines in airborne surveys by using the relationships related to the probability of discovery, obtained based on geometric probability theories and Buffon's needle problem. McCammon [12] and Chung [13] also used this theory to study the effect of the distance of the parallel survey lines on the possibility of deposit exploration.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Semi-Airborne Electromagnetic Survey Design for Mineral Exploration

2023

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As semi-airborne mineral exploration has a limited budget, it is critical to design experimental procedures that generate data to maximize desired information. We investigated the effects of transmitter–receiver geometries for a variety of anomalies and semi-airborne layouts. Our simulations indicated that flight line spacing of 200 m and a point distance of 100 m provides the optimal trade-off between coverage and survey progress for various targets. Based on the target size and distance between the transmitter and the target, the transmitter length should be at least equal to the length of the target. However, where the distance between the transmitter and the target is more than 1 km, the transmitter length should be at least two or three times the target size. Of similar importance are the location and direction of the transmitter cables, which can have a significant impact on the result of inversion and should be parallel to the target strike. By using more than one transmitter, better results can be obtained. If the strike of the target is known, transmitters should be parallel to each other, and if not, it is better to use perpendicular transmitters. The results of this study showed that the optimal distance between transmitters is 3 km. Our simulations showed that it is even possible to recover targets just below the transmitter in corresponding areas of masked data.

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“…Since the geometric parameters of mineral deposits are of a probable nature, the exploration of mineral deposits is also of a probable nature and is always associated with uncertainty and some risk. Agocs [10] is one of the first that studied the effect of changing the distance of flight lines and the location of these lines in airborne surveys by using the relationships related to the probability of discovery, which are obtained based on geometric probability theories and Buffon's needle problem. McCammon [11] and Chung [12] also used this theory to study the effect of the distance of the parallel survey lines on the possibility of deposit exploration.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Semi-Airborne Electromagnetic Survey Design for Mineral Exploration

Nazari¹,

Rochlitz²,

Günther³

2023

Preprint

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As semi-airborne mineral exploration has limited budgets, it is critical to design experimental procedures that generate data maximizing the desired information We investigate the effects of transmitter-receiver geometries for a variety of anomalies and semi-airborne layouts. Our simulations indicate that 200 m flight line spacing and 100 m point distance are the optimal trade-off between coverage and survey progress for various targets. Based on the target size and distance between the transmitter and the target, the transmitter length should be at least equal to the length of the target and for more than 1 km, at least two or three times the target size. Likewise important are the location and direction of the transmitter cables, which can have great impact on the result of inversion and should be parallel to the target strike. By using more than one transmitter, better results are obtained. If the strike of the target is known, transmitters should be parallel to each other and if not, it is better to use perpendicular transmitters. Results showed that the optimal distance between transmitters is 3 km. Our simulations show that it is even possible to recover targets just below the transmitter in corresponding areas of masked data.

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Line Spacing Effect and Determination of Optimum Spacing Illustrated by Marmora, Ontario Magnetic Anomaly

Cited by 19 publications

References 0 publications

Three‐dimensional probability tomography of self‐potential anomalies of graphite and sulphide mineralization in Orissa and Rajasthan, India

Three‐dimensional probability tomography of self‐potential anomalies of graphite and sulphide mineralization in Orissa and Rajasthan, India

Optimizing Semi-Airborne Electromagnetic Survey Design for Mineral Exploration

Optimizing Semi-Airborne Electromagnetic Survey Design for Mineral Exploration

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