Review of the use of magnetic concentrates in geochemical exploration

Overstreet, William C.; Day, Gordon W.

doi:10.3133/ofr85541

Cited by 4 publications

(3 citation statements)

References 76 publications

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“…Instead, the specifications of the program were based on practices adopted by earlier workers in the region, on experience gained by the first author elsewhere in the Arabian Shield, and on the general approach of the USGS Saudi Arabian Mission to geochemical sampling. Particular background information that contributed to the design of the survey was provided by Parker (1982), Samater (1982), Samater and others (1989), Sanderson (1984), Gaukroger and Sale (1985), Overstreet and Day (1985), and Saleh (1985). Because of the mountainous character of the survey area, contamination by eolian debris is minimal, and no special precautions were taken to screen out very fine grained, wind-borne material (Barbier, 1987).…”

Section: Field and Laboratory Proceduresmentioning

confidence: 99%

Reconnaissance geochemical survey of the Farah Garan-Kutam mineral belt, Kingdom of Saudi Arabia

Samater¹,

Johnson²,

Bookstrom³

1991

Open-File Report

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Wadi-sediment samples were collected from 450 sites in a 580-km2 area (sample density 1.5 per km2) as part of an exploration program designed to assess the mineral potential of the Farah Garan -Kutam mineral belt and to evaluate mineralization at the Farah Garan ancient working (DGMR Project 3.03.10). Demagnetized panned-concentrate and sieved minus-80-mesh fractions were prepared from each bulk sample of approximately 5 kg. The fractions were analyzed for silver, arsenic, copper, lead, and zinc by atomic-absorption methods and for gold by an atomic-absorption graphite-furnace method.The analytical results for the panned-concentrate samples delineate 21 anomalies, and the results for the minus-80-mesh samples delineate 24. Of the latter, 14 are coincident with panned-concentrate anomaly areas, whereas 10 are uniquely defined. The analytical results of the panned-concentrate samples uniquely define two areas. Overall, the panned-concentrate samples yielded threshold values higher than the threshold values for the minus-80-mesh samples (for gold, 10 times higher), and delineate anomalous areas larger than those for the minus-80-mesh samples. This observation is consistent with the results of similar surveys elsewhere in the Arabian Shield, which indicate that panned-concentrate samples more effectively outline geochemical anomalies than sieved fine-grained samples.In the present survey, geochemical anomalies locate all the sites of mineralization known from previous work. The survey is therefore technically a success. However, a large number of these anomalies probably result from contamination of the wadi systems by metal dispersed from ancient mine workings, and this particular survey, overall, may be of limited value as a guide to the discovery of hitherto unknown mineralization. Nevertheless, the survey outlines two areas that may mark extensions to known mineralization, and a number of other areas in which no mineralization is known. Based on a consideration of the character of the bedrock geology, the value of each reported analytical result in relation to the respective element thresholds, and the number of anomalous samples that cluster in any given area, four areas are recommended for high-priority follow-up sampling.

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Section: Field and Laboratory Proceduresmentioning

confidence: 99%

Reconnaissance geochemical survey of the Farah Garan-Kutam mineral belt, Kingdom of Saudi Arabia

Samater¹,

Johnson²,

Bookstrom³

1991

Open-File Report

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“…Such a review was perceived to be necessary in the context of the growing interest in applications of geochemistry to mineral exploration in Saudi Arabia. In another report (Overstreet and Day, 1985), the role of magnetic concentrates as a geochemical sample medium is considered in its historic relation to the use of heavy-mineral concentrates in the search for ore deposits.…”

Section: Purpose Of the Present Investigationmentioning

confidence: 99%

Minor elements in magnetic concentrates from the Syenite-Shonkinite Province, southern Asir, Kingdom of Saudi Arabia

Overstreet¹,

Day²,

Botinelly³

et al. 1987

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“…Analysis of the samples revealed geochemical anomalies that could be traced downdrainage for several miles. Overstreet and Day (1985) surveyed the literature on the use of magnetic concentrates in geochemical exploration. In their review, the term "magnetic concentrates" referred to those minerals in panned concentrates that have a magnetic permeability considerably greater than one, a positive magnetic susceptibility, and that are attracted to a permanent magnet.…”

Section: Pannedmentioning

confidence: 99%

Geochemical sampling in arid environments by the U.S. Geological Survey

Hinkle¹

1988

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Review of the use of magnetic concentrates in geochemical exploration

Cited by 4 publications

References 76 publications

Reconnaissance geochemical survey of the Farah Garan-Kutam mineral belt, Kingdom of Saudi Arabia

Reconnaissance geochemical survey of the Farah Garan-Kutam mineral belt, Kingdom of Saudi Arabia

Minor elements in magnetic concentrates from the Syenite-Shonkinite Province, southern Asir, Kingdom of Saudi Arabia

Geochemical sampling in arid environments by the U.S. Geological Survey

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