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Gold Mineralization of the Youngbogari Mine, Youngdong Area  

Heo, Chul-Ho (Mineral Resources Group, Geology & Geoinformation Division, Korea Institute of Geoscience and Mineral Resources(KIGAM))
Chi, Se-Jung (Mineral Resources Group, Geology & Geoinformation Division, Korea Institute of Geoscience and Mineral Resources(KIGAM))
Publication Information
Journal of the Mineralogical Society of Korea / v.20, no.2, 2007 , pp. 115-124 More about this Journal
Abstract
Electrum-sulfide mineralization of the Youngbogari mine area occurred in two stages of massive quartz veins that fill the fractures along the fault/shear zones in the Precambrian gneiss. Ore mineralogy is simple, consisting of arsenopyrite $(31.4{\sim}33.4atom.%As)$, pyrite, sphalerite $(4.1{\sim}17.6mole%FeS)$, galena, chalcopyrite, argentite, and electrum. Electrum $(60.3{\sim}87.6atom.%Ag)$ is associated with galena, chalcopyrite and late sphalerite infilling the fractures in quartz and sulfides. Fluid inclusion data show that ore mineralization was formed from $H_2O-CO_2-CH_4-NaCl$ fluids $(X_{CO2+CH4}=0.0\;to\;0.2)$ with low salinities (0 to 10wt.% eq. NaCl) at temperatures between $200^{\circ}\;and\;370^{\circ}C$. Gold-silver mineralization occurred later than the base-metal sulfide deposition, at temperatures near $250^{\circ}C$ and was probably a result of cooling and decreasing sulfur fugacity caused by sulfide precipitation and/or $H_2S$ loss through fluid unmixing.
Keywords
electrum; fluid inclusion; unmixing;
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