Determination of Au in Deep-penetrating Geochemical Samples of the Wangjiaping Gold Deposit by ICP-MS with Extraction Elements of Mobile Forms

YANG Hai-tao; KANG Wen-gui; WANG Chao; HU Xi-shun; LIU Xin-wei

doi:10.15898/j.cnki.11-2131/td.202012120161

Rock and Mineral Analysis > 2021 > 40(5): 774-782. > DOI: 10.15898/j.cnki.11-2131/td.202012120161

YANG Hai-tao, KANG Wen-gui, WANG Chao, HU Xi-shun, LIU Xin-wei. Determination of Au in Deep-penetrating Geochemical Samples of the Wangjiaping Gold Deposit by ICP-MS with Extraction Elements of Mobile Forms[J]. Rock and Mineral Analysis, 2021, 40(5): 774-782. DOI: 10.15898/j.cnki.11-2131/td.202012120161

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Determination of Au in Deep-penetrating Geochemical Samples of the Wangjiaping Gold Deposit by ICP-MS with Extraction Elements of Mobile Forms

1.
Xi'an Northwest Geological Institute for Nonferrous Metals Co., LTD., Xi'an 710054, China
2.
Shaanxi Engineering Technology Research Centre of Comprehensive Utilization of Mineral Resources, Xi'an 710054, China
3.
Northwest Mineral Geological Analytic Centre of Nonferrous Metals, Xi'an 710054, China

More Information

Received Date: December 11, 2020
Revised Date: June 01, 2021
Accepted Date: July 19, 2021
Published Date: September 27, 2021

Abstract

HIGHLIGHTS
(1) The experimental conditions such as solid-liquid ratio, temperature and time during the active state extraction of gold were studied.

(2) The active extraction effect of samples of different particle sizes was compared, and the extraction effect of -80 mesh sample was found to be the best.

(3) Gold activity state extraction and determination technology were applied to the hidden gold detection test in the middle and low mountain landscape area of the Qinling Mountains.

ABSTRACT

BACKGROUNDMetal activity state measurement method is one of the effective means to find hidden ore. However, during the application of the method, it was found that the types of effective activity states of gold in different geochemical landscape conditions were not the same. Moreover, it was found that the conditions such as solid-liquid ratio, temperature and time during the extraction would have a significant impact on the active state extraction data.
OBJECTIVESTo solve the problems of selective extraction and accurate determination of the active state of gold.
METHODSA comparative study of different experimental conditions and samples of different grain sizes for the active state extraction of gold from the Wangjiaping gold deposit in the Qinling area using ICP-MS analysis.
RESULTSThe optimal extraction conditions for gold element water extraction state, clay adsorption state, organic binding state and iron manganese oxide state were determined. Solid-liquid ratio was 1:5, the extraction time was 24h, the extraction temperature was 35℃ and the sample size range was -80 mesh. The method detection limits for the four phase states of elemental gold were 0.03ng/g for water extraction state 0.03ng/g for clay adsorption state, 0.04ng/g for organic binding state, 0.05ng/g for iron manganese oxide state. The relative standard deviation (RSD) was 7.25%-9.02%. In the 23rd line of the Wangjiaping gold deposit, the average content of the water extracted state gold was 0.19×10^-9, the average clay adsorption state gold was 0.30×10^-9, the average organic binding state gold was 11.16×10^-9, and the average iron manganese oxide state gold was 0.20×10^-9.
CONCLUSIONSThe organic binding state is the main active phase state of gold in the soil of the mining area, and the abnormality of the organic binding state of gold is consistent with the position of the hidden gold ore body.

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References (43)

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Determination of Au in Deep-penetrating Geochemical Samples of the Wangjiaping Gold Deposit by ICP-MS with Extraction Elements of Mobile Forms

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