Mineralogy and geochemistry of the Au-Ag ore deposits of the South Korean Peninsula |
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| Authors: | H Kaneda H Shimazaki M S Lee |
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| Institution: | (1) Department of Mineral Development Engineering, Faculty of Engineering, the University of Tokyo, Hongo, 113 Tokyo, Japan;(2) Geological Institute, Faculty of Science, the University of Tokyo, Hongo, 113 Tokyo, Japan;(3) Department of Earth Science, College of Education, Seoul National University, Seoul, Republic of Korea |
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| Abstract: | Pyrite and arsenopyrite are the predominant ore minerals in the Korean Au-Ag deposits of this study. The X
Ni
py
, X
Co
py
, X
Ni
apy
, and X
Co
apy
values range between 100 and 3,000 ppm, 200 and 6,000 ppm, 200 and 8,200 ppm, and 100 and 10,200 ppm, respectively. Most X
Ni
py
/X
Co
py
values fall in the field lower than values varying 0.16–1.30. Arsenopyrite also tends to prefer cobalt rather than nickel showing X
Ni
apy
/X
Co
apy
values between 0.20 and 1.40. The concentrations of minor elements in ores and gangue minerals vary 1–55 ppm Au and 1–1,120 ppm Ag for the former and 4–57 ppm Ni and 2–45 ppm Co for the latter. The Au/Ag ratio in ore has a good correlation to the Ni/Co ratio of arsenopyrite to gangue. The (Ni/Co)py-(Ni/Co)gangue and (Ni/Co)apy-(Ni/Co)gangue diagrams revealed that the values from the Korean Au-Ag deposits plot in the field lower than 900 °C which is the lowermost temperature determined by previous partitioning experiments. |
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| Keywords: | |
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