Mode of Occurrence and Chemical Composition of Electrums from the Gubong Gold-Silver Deposits, Republic of Korea

전체 글

(1) , 35, 3 , 191-201, 2002 Econ. Environ. Geol., 35(3), 191-201, 2002.

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(3) . . . . Mode of Occurrence and Chemical Composition of Electrums from the Gubong Gold-Silver Deposits, Republic of Korea Bong Chul Yoo1*, Seon Gyu Choi2 and Hyun Koo Lee1 1. Department of geology, Chungnam National University Department of earth and environmental sciences, Korea University. 2. The Gubong gold-silver deposits is gold-silver-bearing hydrothermal massive quartz veins which were filled the fractures along fault shear (NE, NW) zones within Precambrian banded or granitic gneiss of Gyeonggi massif. Ore mineralization of this deposits is contained within a single stage of quartz vein which was formed by multiple episodes of fracturing and healing. Ore minerals are composed mainly of arsenopyrite, pyrite, sphalerite, chalcopyrite, galena with minor amounts of pyrrhotite, marcasite and electrum. The frequency and volume percentages of electrums associated with ore minerals from this deposits are recognized as follows; 44.5% and 54.3% with arsenopyrite, 24.3% and 33.8% with quartz, 12.6% and 0.1% with pyrite, 11.0% and 4.8% with galena, 5.0% and 7.0% with sphalerite and 2.5% and 0.02% with chalcopyrite, respectively. They show irregular (41.6%), subround (34.7%), elongate (17.0%) and granular (6.6%) shapes, respectively. Their grain size ranges from 2 to 150 µm, but 90.9 percent of the grains are below 30 µm. The chemical composition of electrums ranges from 26.39 to 72.51 Au atomic %. These composition (Au atomic %) on the basis of associated minerals are from 44.97 to 71.75 with arsenopyrite, pyrite, sphalerite and quartz, from 44.37 to 72.51 with quartz, from 35.40 to 41.01 with sphalerite and chalcopyrite, from 26.39 to 54.84 with pyrite, chalcopyrite, quartz and galena, from 28.49 to 53.28 with galena, respectively. We suggest that optimum recovery of gold would be obtained with reference to these results. Key words : Gubong gold-silver deposits, Electrum, Size, Composition.

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(67) *. *. . Frequency distribution of electrums in associated minerals and grain size of electrums from each vein of the Gubong mine.

(68) . Grain size (µm) Asso. Min. mesh. -30 -400. -44 -325. -53 -270. -62.5 -230. -74 -200. -88 -170. -105 -140. -125 -120. -149 -100. -177 177< -80 80<. No.6 vein. Asp Py Sp Gn Qz Total (%). 31 10 6 19 57 123 84.25. 0 0 0 0 6 6 4.11. 0 0 1 3 2 6 4.11. 0 0 0 0 5 5 3.42. 0 0 1 1 1 3 2.05. 0 0 0 0 0 0 0.00. 0 0 0 0 2 2 1.37. 0 0 0 0 0 0 0.00. 0 0 0 0 0 0 0.00. 1 0 0 0 0 1 0.68. 0 0 0 0 0 0 0.00. 32 10 8 23 73 146. Bongam2 vein. Py Sp Cp Gn Total (%). 17 3 8 7 35 100.00. 0 0 0 0 0 0.00. 0 0 0 0 0 0.00. 0 0 0 0 0 0.00. 0 0 0 0 0 0.00. 0 0 0 0 0 0.00. 0 0 0 0 0 0.00. 0 0 0 0 0 0.00. 0 0 0 0 0 0.00. 0 0 0 0 0 0.00. 0 0 0 0 0 0.00. 17 3 8 7 35. Asp Py Sp Gn Qz Total (%). 107 13 3 5 2 130 95.59. 0 0 0 0 1 1 0.74. 0 0 1 0 0 1 0.74. 1 0 0 0 0 1 0.74. 0 0 1 0 0 1 0.74. 0 0 0 0 0 0 0.00. 0 0 0 0 1 1 0.74. 0 0 0 0 0 0 0.00. 0 0 0 0 0 0 0.00. 1 0 0 0 0 1 0.74. 0 0 0 0 0 0 0.00. 109 13 5 5 4 136. Gunryang vein. Asp; arsenopyrite, Py; pyrite, Sp; sphalerite, Cp; chalcopyrite, Gn; galena, Qz; quartz.. Total Total(%) 21.92 6.85 5.48 15.75 50.00 100.00 48.57 8.57 22.86 20.00 100.00 80.15 9.56 3.68 3.68 2.94 100.00.

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(70) . Volume percent of electrums in associated minerals and grain size of electrums from each vein of the Gubong mine.. Grain size(µm) Asso. Min. mesh. -30 -400. -44 -325. -53 -270. -62.5 -230. -74 -200. -88 -170. -105 -140. -125 -120. -149 -100. -177 -80. 177< Total(%) 80<. No.6 vein. Asp Py Sp Gn Qz (%). 0.49 0.06 0.21 0.69 3.69 5.14. 0.00 0.00 0.00 0.00 3.22 3.22. 0.00 0.00 1.43 3.78 2.60 7.81. 0.00 0.00 0.00 0.00 11.37 11.37. 0.00 0.00 4.83 3.07 3.31 11.21. 0.00 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 20.16 20.13. 0.00 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00 0.00. 41.09 0.00 0.00 0.00 0.00 41.09. 0.00 41.58 0.000 0.06 0.00 6.47 0.00 7.54 0.00 44.35 0.00 100.00. Bongam2 vein. Py Sp Cp Gn (%). 3.16 45.87 22.76 28.21 100.00. 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00. 3.16 45.87 22.76 28.21 100.00. Gunryang vein. Asp Py Sp Gn Qz (%). 1.49 0.18 0.27 0.10 0.003 2.04. 0.00 0.00 0.00 0.00 1.09 1.09. 0.00 0.00 1.85 0.00 0.00 1.85. 4.48 0.00 0.00 0.00 0.00 4.48. 0.00 0.00 5.65 0.00 0.00 5.65. 0.00 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 14.83 14.83. 0.00 0.00 0.00 0.00 0.00 0.00. 0.00 0.00 0.00 0.00 0.00 0.00. 70.05 0.00 0.00 0.00 0.00 70.05. 0.00 0.00 0.00 0.00 0.00 0.00. 76.02 0.18 7.77 0.10 15.92 100.00. Asp; arsenopyrite, Py; pyrite, Sp; sphalerite, Cp; chalcopyrite, Gn; galena, Qz; quartz.. ê ¸( v6}; À ,O , 0 f ê ¸( v6 } v6¹ Ñr ¸( v6}; À ºB Í¹ ýi ¸( v6}; À ¸( v6}; À Ñr ¸( v6}; À ê ¸( v6}; À ¸( v6}; À ,O , ý i ¸( v6B ?³¯´Z XY; ?³¯´ ~Z x k j i? ¶ XY% gª ^B DvZ Ð ?O v6}; ?³¯ ´Z v6XY; ~X ß[;X tNX <x C; õX +, mÊ 5 oB ?O _; À` a tNX <xX ß[; X ~X % n .B tNX <xX ß[;X ~X % n .B Í¹ ß[;X tNX ~X <xX % n .B ?³¯´Z v6¹ ¾vZ bn; ?³¯´ ~ uZ x j ªZ bÊ ?³¯´Z v6XYZ bÊ ?³¯´ ~uZ º ª ,. *. '. *. . *. * .

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(89) . . Photomicrographs of ore minerals from the Gubong mine. A; Electrum coexisting with sphalerite and quartz from No.6 vein, B; Electrum coexisting with galena from No.6 vein, C; Electrum and chalcopyrite infilling fracture of sphalerite from Bongam2 vein, D; Electrum coexisting with galena from Bongam2 vein, E; Electrum coexisting with sphalerite and arsenopyrite from Gunryang vein, F; Electrum coexisting with galena from Gunryang vein. Abbreviation: Asp; arsenopyrite, Py; pyrite, Sp; sphalerite, Cp; chalcopyrite, Gn; galena, El; electrum. Scale bar indicated 50 micron in length.. ?³¯´ 0M ~? . ; ¸( v6}; ?³¯´? kèV ` #ÐV 3 ê ¸( v6}; ? ³¯´? kèV ` #ÐV ,O HD¼5 n R è B DvZ Ð 5 ?³ ¯´? . HD¼5 µ 4A !. "# * . !

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(92) Chemical composition of electrums from the Gubong mine. Au. Weight % Ag. Total. Au. D.S.97126-2(3) D.S.97126-2(2) D.S.97126-2 D.S.97126-2(3) D.S.97126-2(2) D.S.97126-2(4) D.S.97126-2(3) D.S.97724-1-8(2) D.S.97724-1-8(2) D.S.97724-1-8(3) D.S.97724-1-8(2) D.S.97724-1-8(2) D.S.97724-1-8 D.S.97724-1-8(2) D.S.97724-1-8 D.S.97724-2-5 D.S.97724-2-5(2) D.S.97724-2-5(2) D.S.97724-2-5(2) D.S.97724-2-5 D.S.97724-2-5(5) D.S.97724-2-5(2) D.S.97126-3(4) D.S.97126-14 D.S.97126-14(2) D.S.97126-14(2). 69.49 67.48 67.15 62.55 59.24 61.74 61.04 73.27 79.62 71.75 70.45 70.65 68.90 67.34 66.59 80.35 81.64 82.64 80.06 79.35 78.63 63.35 78.29 80.27 78.93 67.63. 30.07 32.06 32.19 36.89 40.68 38.42 38.83 26.64 20.76 27.52 29.50 29.71 31.07 32.34 33.59 19.52 18.48 17.16 20.26 20.92 21.78 36.40 21.87 19.93 21.00 32.44. 99.56 99.54 99.34 99.44 99.92 100.16 99.87 99.91 100.38 99.27 99.95 100.36 99.97 99.68 100.18 99.87 100.12 99.80 100.32 100.27 100.41 99.75 100.16 100.20 99.93 100.07. 55.86 53.55 53.32 48.15 44.37 46.81 46.26 60.10 67.75 58.81 56.67 56.57 54.84 53.28 52.05 69.27 70.75 72.51 68.40 67.50 66.41 48.80 66.22 68.81 67.30 53.31. 44.14 46.45 46.68 51.85 55.63 53.19 53.74 39.90 32.25 41.19 43.33 43.43 45.16 46.72 47.95 30.73 29.25 27.49 31.60 32.50 33.59 51.20 33.78 31.19 32.70 46.69. 0.79 0.87 0.88 1.08 1.25 1.14 1.16 0.66 0.48 0.70 0.76 0.77 0.82 0.88 0.92 0.44 0.41 0.38 0.46 0.48 0.51 1.05 0.51 0.45 0.49 0.88. Sp,Qz Qz Qz QZ Qz Qz,Gn Qz,Gn Sp,Qz Qz Qz Qz Qz Py,Gn Gn Gn Sp Sp,Qz Qz Qz Qz Qz Qz,Gn Asp,Qz Py Qz Qz,Gn. massive white. I I I I I I I I. B.A.97724-3-1(4) B.A.97724-3-1 B.A.97724-3-1(2) B.A.97724-3-1 B.A.97724-3-1 B.A.97724-3-1 B.A.97724-3-1 B.A.9827-11(3). 55.42 50.14 58.22 56.97 53.85 54.95 56.10 58.79. 44.61 50.11 42.34 43.57 47.07 44.53 44.19 41.35. 100.03 100.25 100.56 100.54 100.92 99.48 100.29 100.14. 40.49 35.40 42.96 41.73 38.52 40.33 41.01 43.78. 59.51 64.60 57.04 58.27 61.48 59.67 58.99 56.22. 1.47 1.82 1.33 1.40 1.60 1.48 1.44 1.28. Sp,Cp Sp,Cp Py,Gn Py,Gn Py,Gn Cp Cp Gn. Massive white. I I I I I I I I I I I I I I I. G.R.9827-8(5) G.R.9827-8(4) G.R.9827-8(4) G.R.9827-8(3) G.R.9827-8(3) G.R.9827-8(2) G.R.97724-5-3(2) G.R.97724-5-3(4) G.R.97724-5-3(2) G.R.97724-5-3(2) G.R.97724-5-2(4) G.R.97724-5-5(4) G.R.97724-5-5(2) G.R.97724-5-5(2) G.R.9827-10(4). 69.69 69.88 63.82 59.99 66.70 52.31 81.86 64.67 58.60 58.59 65.42 46.74 43.37 39.26 42.10. 30.04 30.42 36.21 40.20 32.61 47.05 17.66 35.83 41.54 41.79 34.38 53.34 56.98 59.97 57.86. 99.73 100.30 100.02 100.19 99.31 99.36 99.52 100.51 100.14 100.38 99.80 100.08 100.35 99.23 99.96. 55.96 55.71 49.12 44.97 52.83 37.84 71.75 49.71 43.59 43.44 51.03 32.43 29.42 26.39 28.49. 44.04 44.29 50.88 55.03 47.17 62.16 28.25 50.29 56.41 56.56 48.97 67.57 70.58 73.61 71.51. 0.79 0.80 1.04 1.22 0.89 1.64 0.39 1.01 1.29 1.30 0.96 2.08 2.40 2.79 2.51. Sp Sp Sp Sp Sp,Qz Gn Asp Cp,Gn Cp,Gn Cp,Gn Sp Py,Gn Py,Gn Py,Gn Gn. Massive grey. Vein. Stage. Sample No.. No.6 ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto. I I I I I I I I I I I I I I I I I I I I I I I I I I. Bongam2 ditto ditto ditto ditto ditto ditto ditto Gunryang ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto ditto. Atomic % Associated Ag Ag/Au mineral. Grey. Massive white. Asp; arsenopyrite, Py; pyrite, Sp; sphalerite, Cp; chalcopyrite, Gn; galena, Qz; quartz, Values in parentheses are analyzed number..

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