Application of EPMA to Study the Characteristics of Gold-bearing Minerals in the Zhaojiazhuang Gold Deposit in Longnan, Gansu Province

Guo-qiang JING; Kang LIAN; Fei-fei HU; Lei LI; Ya-long DU

doi:10.15898/j.cnki.11-2131/td.201707170119

Rock and Mineral Analysis > 2018 > 37(5): 490-498. > DOI: 10.15898/j.cnki.11-2131/td.201707170119

Guo-qiang JING, Kang LIAN, Fei-fei HU, Lei LI, Ya-long DU. Application of EPMA to Study the Characteristics of Gold-bearing Minerals in the Zhaojiazhuang Gold Deposit in Longnan, Gansu Province[J]. Rock and Mineral Analysis, 2018, 37(5): 490-498. DOI: 10.15898/j.cnki.11-2131/td.201707170119

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Application of EPMA to Study the Characteristics of Gold-bearing Minerals in the Zhaojiazhuang Gold Deposit in Longnan, Gansu Province

No. 203 Research Institute of Nuclear Industry, Xianyang 712000, China

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Received Date: July 16, 2017
Revised Date: March 11, 2018
Accepted Date: June 12, 2018
Published Date: August 31, 2018

Abstract

HIGHLIGHTS
(1) Microscopic observation and EPMA analysis of selected gold-bearing minerals in the Zhaojiazhuang gold deposit.

(2) The gold contents of main gold-bearing minerals (pyrite and chalcopyrite, etc) in the gold ore are different, which is related to the ore-forming stages of gold-bearing minerals.

(3) Gold-bearing minerals fine-grained and strawberry-like pyrite have high gold content, and gold exists in two forms.

ABSTRACT

BACKGROUNDMicroscopy and Electron Microprobe are the main methods for the study of gold-bearing minerals. Using these methods, the content and morphology of gold-bearing minerals and their spatial relationship with other minerals were studied in the Zhaojiazhuang gold deposit. The gold-bearing minerals were qualitatively and quantitatively analyzed.
OBJECTIVESTo summarize the gold-bearing minerals with the significance of prospecting and the features of indicator minerals.
METHODSMicroscopy and Electron Microprobe.
RESULTSThe main gold-bearing mineral is pyrite, then chalcopyrite and sphalerite. The contents of Au in the main gold-bearing minerals follow the sequence of fine-grained pyrite > coarse-grained pyrite > strawberry pyrite > chalcopyrite. The distribution of Au in different stages of pyrite (coarse pyrite, fine pyrite, strawberry pyrite) is uniform. Fine-grained and strawberry pyrite have higher gold content (average 0.14%-0.18%), indicating that these types of pyrite formed by tectonic hydrothermal fluids where Au concentrates more easily. There are two occurrences of gold in the Zhaojiazhuang Au deposit. Visible gold is wrapped in gangue minerals, or embedded in mineral crystal gaps and cracks in the form of fissure gold. Invisible gold exists in the gold-bearing minerals in the form of nano-scale gold particles. Invisible gold is the main existence form of Au.
CONCLUSIONSThis study provides evidence for the study of the genesis, metallogenic process and mechanism of the same deposits and it is easy to select suitable methods for ore selection and smelting based on the characteristics of gold-bearing minerals.
- Electron Microprobe,
- gold,
- occurrence state,
- gold-bearing minerals,
- pyrite

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