Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Gold-Silver Mineralizations in the Imgye District

임계지역(臨溪地域)의 금(金)-은(銀) 광화작용(鑛化作用)

  • Park, Hee-In (Dept. of Geological Sciences, Seoul National University) ;
  • Hwang, Jeong (Dept. of Geological Sciences, Seoul National University) ;
  • Huh, Soon-Do (Dept. of Geological Sciences, Seoul National University)
  • 박희인 (서울대학교 지질과학과) ;
  • 황정 (서울대학교 지질과학과) ;
  • 허순도 (서울대학교 지질과학과)
  • Received : 1992.07.08
  • Published : 1992.08.31
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Abstract

The gold ore deposits of Nakcheon, Gongyeong and Dongmyeong mine in the Imgye district are E-W trending fissure filling veins emplaced in Precambrian Jungbongsan granite and sedimentary rocks of Cambrian Yangdeog group. The K-Ar age for vein alteration sericite and vein laced muscovite are 73 and 93 Ma, respectively. Vein structure and mineralogy indicate the three distinct depositional stages: I) basemetal sulfides and tin minerals, II) gold-basemeatl sulfides, III) gold-silver-basemetal sulfides. Major gold and silver ore minerals are electrum, native silver, pyrargyrite and argentite. Fluid inclusion data indicate that filling temperatures were from $350^{\circ}C$ to $190^{\circ}C$ through stage I, II and III. Salinities were in the range of 0.0~9.5 NaCl eq.wt.% and do not reveal any systematic trend. Intermittent boiling of ore fluid during stage I is indicated by fluid inclusions in quartz. Fluid pressure during stage I which is estimated from fluid inclusions showing boiling evidence range from 50 to 100 bars. Gold ore deposits of the Imgye district were formed under higher temperatures and lower sulfur fugacities compared with the Eunchi silver ore deposits about 8 Km apart from the Imgye district.

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Acknowledgement

Supported by : 과학재단