Mining Geology

Mineralization Ages of Ofukeshi, Shizukari, Yakumo and Jokoku Deposits and Structural Movements Related to Vein-type Mineralization in Southwest Hokkaido

Yasushi WATANABE

1991 Volume 41 Issue 227 Pages 141-146
Published: June 30, 1991
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11456/shigenchishitsu1951.41.141

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K-Ar age determination of mica minerals and adularia from four vein-type deposits (Ofukeshi, Shizukari, Yakumo and Jokoku) in southwest Hokkaido has been carried out. The results indicate that the Ofukeshi and Shizukari deposits were formed during the Late Pliocene, and the Yakumo deposit during the Early Pleistocene. Vein-type mineralization of the Jokoku deposit is inferred to have occurred at ca. 5.2 Ma.
During Plio-Pleistocene time, E-W dextral strike-slip veins were formed at northern part of southwest Hokkaido, while conjugate sets of veins were produced at southern part. This localization is concordant with structural movements caused by oblique subduction of the Pacific Plate under the Kuril Arc.

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Dissolution and Precipitation of Gold and Silver in the System 6N HCI Solution-Au-Ag Alloys at 150°C Over 120 Days

Hisahide HONMA, Naotatsu SHIKAZONO, Masataka NAKATA

1991 Volume 41 Issue 227 Pages 147-150
Published: June 30, 1991
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11456/shigenchishitsu1951.41.147

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The experiments were carried out in the system 6N HC1 aqueous solution-synthetic Au-Ag alloys with various Ag/Au ratios in order to investigate the dissolution and precipitation of gold and silver at 150°C over a period of 120 days. Pure gold precipitate was formed in run #3(Au₅₀Ag₅₀), #4(Au₇₅Ag₂₅) and #5(Au₉₀Ag₁₀), in which the Ag/Au atomic ratio in solution was less than 1. Gold-silver alloy (electrum) was formed in run #1(Au₁₀Ag₉₀) and #2(Au₂₅Ag₇₅), in which the Ag/Au atomic ratios in solution were about 330 and 670, respectively. Assuming that gold and silver chloro-complexes are dominant in ore fluids, Ag/Au atomic ratios in ore fluids for the Transbaykalial gold deposits and the Japanese auriferous hydrothermal vein deposits are calculated and estimated to lie in the range of 7 to 690.

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Gold Content of Jurassic and Cretaceous Granitic Rocks in Korea

Chung Han YOON

1991 Volume 41 Issue 227 Pages 151-158
Published: June 30, 1991
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11456/shigenchishitsu1951.41.151

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Gold contents have been determined on 175 Jurassic and Cretaceous plutonic rocks from the southern part of Korea by the method of graphite furnace atomic absorption spectroscopy.
The results are as follows; (1) for the Jurassic gabbroids, the range is 0.3-1.9 ppb and the average is 0.6 ppb; (2) for the Jurassic diorites, the range is 0.5-1.7 ppb and the average is 0.8 ppb; (3) for the Jurassic granitoids, the range is 0.4-7.0 ppb and the average is 1.8 ppb; (4) for the Cretaceous granitoids, the range is 0.5-7.4 ppb and the average is 2.8 ppb. The gold content of Jurassic and Cretaceous plutonic rocks of Korea tends to increase from mafic rocks to felsic rocks, and that of Cretaceous granitoids is slightly higher than that of Jurassic ones. Average gold content of the studied rocks tends to show positive correlations with average Se, Te and TI content, but negative correlation with average Ag content except that of diorites.

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Bibliography of the Published Papers, Reports, Articles and Abstracts on Water-Rock, Mineral, Glass (Natural Glass, Engineering Glass, High-Level Radioactive Waste Glass), and Ceramics Interaction

Fumitaka YANAGISAWA, Yukihiro MATSUHISA, Masahiro AOKI

1991 Volume 41 Issue 227 Pages 159-162
Published: June 30, 1991
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11456/shigenchishitsu1951.41.159

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Rate and Mechanism of Dissolution of Silicate Minerals into Aqueous Solution

Characterization of a Mineral-Aqueous Solution Interface

Koichiro FUJIMOTO

1991 Volume 41 Issue 227 Pages 163-172
Published: June 30, 1991
Released on J-STAGE: December 14, 2009

DOIhttps://doi.org/10.11456/shigenchishitsu1951.41.163

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[title in Japanese]

1991 Volume 41 Issue 227 Pages 173-193
Published: June 30, 1991
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11456/shigenchishitsu1951.41.173

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[title in Japanese]

1991 Volume 41 Issue 227 Pages 194-201
Published: June 30, 1991
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11456/shigenchishitsu1951.41.194

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ERRATUM

1991 Volume 41 Issue 227 Pages 201a
Published: 1991
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11456/shigenchishitsu1951.41.227_201a

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ERRATUM

1991 Volume 41 Issue 227 Pages 201b
Published: 1991
Released on J-STAGE: June 12, 2009

DOIhttps://doi.org/10.11456/shigenchishitsu1951.41.227_201b

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