Some Tellurium Minerals from the Kobetsuzawa Mine, Sapporo, Hokkaido.

Ishibashi, Masao

doi:10.2465/gkk1952.2.447

Cited by 3 publications

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“…The (Au, Ag)Te 2 minerals have been reported from the following ten deposits in Japan ( Fig. 1): Kobetsuzawa (Ishibashi, 1956;Nakata et al, 1985Nakata et al, , 1989, Teine (Watanabe, 1934(Watanabe, , 1935(Watanabe, , 1936(Watanabe, , 1952, and Date (Watanabe, 1952;Honma et al, 1989) in western Hokkaido, Osore-zan (Aoki, 1988) and Mutsu (Kinoshita, 1945;Ishibashi & Ohmachi, 1949) in Shimokita Peninsula, northern Honshu, Kawazu (Watanabe, 1934(Watanabe, , 1952Takasu, 1965), and Suzaki (Watanabe, 1932(Watanabe, , 1933(Watanabe, , 1952Honma et al, 1981) in Izu Peninsula, central Honshu, Agawa (Soeda, 1978) in western Honshu, Kato (Ueno et al, 1990) in northern Kyushu, and Kushikino (Shiga & Urashima, 1988) in southern Kyushu. However, the mineral chemistry of (Au, Ag)Te 2 minerals from these ores have been well described only for the ores from Date , Kato (Ueno et al, 1990) and Kushikino (Shiga & Urashima, 1988).…”

Section: Introductionmentioning

confidence: 99%

(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan

Komuro

Nakata

2016

Resource Geology

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Chemical composition and mode of occurrences of (Au, Ag)Te2 minerals such as calaverite (AuTe2), sylvanite (AuAgTe4) and krennerite ((Au, Ag)Te2) in epithermal gold telluride ores from Suzaki, Kawazu and Teine are examined. In the ores from Suzaki, (Au, Ag)Te2 minerals occur in microbands of tellurides and fine quartz. The minerals in telluride bands change from krennerite, via calaverite‐native tellurium, to sylvanite, in the order of crystallization. A sample from Kawazu contains sylvanite and native tellurium with stutzite, hessite and tetradymite in the coarser gray quartz part. The Teine sample also contains sylvanite and native tellurium with barite and quartz. The peak patterns of XRD of calaverite, krennerite and sylvanite from Suzaki are almost identical to that of JCPDS 43–1472, JCPDS 8–20 and JCPDS 9–477, respectively. The Te, Au, Cu, and Ag contents of calaverite from Suzaki range from 56.4 to 57.9 wt.%, from 41.6 to 42.6 wt.%, from 0.28 to 0.45 wt.% and from 0.14 to 0.31 wt.%, respectively, corresponding to the formula Au0.97Ag0.01Cu0.02Te2. The Te, Au, Ag, and Cu contents of krennerite from Suzaki range from 59.6 to 61.4 wt.%, from 31.3 to 33.6 wt.%, from 4.91 to 6.13 wt.% and from 0.66 to 0.80 wt.%, respectively, corresponding to the formula Au0.71Ag0.22Cu0.05Te2 with Au and Ag ranging from 0.68 to 0.74 and from 0.20 to 0.25, respectively. The Te, Au, Ag, and Cu contents of sylvanite from Suzaki range from 61.5 to 63.4 wt.%, from 24.1 to 27.4 wt.%, from 10.0 to 12.5 wt.% and from 0.00 to 0.12 wt.%, respectively. The Te, Au, Ag, and Cu contents of sylvanite from Kawazu range from 62.7 to 63.3 wt.%, from 23.5 to 24.1 wt.%, from 12.0 to 12.5 wt.% and from 0.09 to 0.16 wt.%, respectively. The Te, Au, Ag, Cu and Fe contents of sylvanite from Teine range from 61.8 to 63.5 wt.%, from 23.6 to 24.7 wt.%, from 11.9 to 13.3 wt.%, from 0.01 to 1.65 wt.% and from 0.00 to 0.02 wt.%, respectively. The average formulae of sylvanite from Suzaki, Kawazu, and Teine are expressed as Au1.06Ag0.94Cu0.02Te4, Au1.00Ag0.95Cu0.02Te4 and Au1.01Ag0.95Cu0.06Te4, respectively. Judging from the mineral assemblages of these ores and other localities, Au–Te mineralization in the Japanese Islands can be divided into four types: native gold–calaverite at Date and Agawa, krennerite(−native tellurium) at Osore‐zan and Mutsu, sylvanite–native tellurium–hessite at Teine, Kawazu, Kobetsuzawa, and Kato, and polyminerallic assemblages at Suzaki and Kushikino. The pH–Eh diagram of aqueous tellurium species and tellurium minerals at 250°C indicates that (Au, Ag)Te2 minerals in epithermal gold telluride mineralization would have been formed under middle to low Eh and acidic (to intermediate) pH conditions. It is possible that dilute tellurium‐containing fluid would scavenge dilute gold.

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Section: Introductionmentioning

confidence: 99%

(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan

Komuro

Nakata

2016

Resource Geology

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“…Koryu and Chitose represent vein type Au-Ag deposits with abundant quartz as a gangue mineral, which is usually referred to as 'gold-bearing quartz vein'. The Kobetsuzawa mine contains both native Au and Au tellurides (Ishibashi, 1956), while minor elements tellurium, bismuth, and selenium are characteristic in Chitose, Teine, and Kobetsuzawa mines.…”

Section: Regional Geologymentioning

confidence: 99%

“…Krennerite (Au 3 AgTe 8 ) from Date is identified by Ishibashi (1960). Rickardite (Cu 3−x Te 2 ), is identified from Kobetsuzawa (Ishibashi, 1956) and Teine (Watanabe, 1932).…”

Section: Ore Mineralogy and Compositional Constraintsmentioning

confidence: 99%

“…Ono et al (2004).2 Ishibashi (1956).2b Nakata et al (1988).3 Watanabe (1932).4 Yamaoka and Nedachi (1978).5 Ishibashi (1960). Abbr: Au, gold-electrum; Alt, altaite; Bism, bismuthinite; Cld, coloradoite; Frb, frohbergite; Gld, goldfieldite; Hs, hessite; Krn, krennerite; Kwt, kawazulite; Pgh, poughite; Pz, petzite; Rcd, rickardite; Sv, silvanite; Stz, stutzite; Ttd, tetradymite, Te, native tellurium; Tl, tellurite; Tla, tellurantimony; Tlb, tellurobismuthite; Tnt, teineite.…”

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Ore–microscopy and Geochemistry of Gold–Silver Telluride Mineralization in Southwestern Hokkaido, Japan

Yuningsih

Matsueda

Syafrie

2018

Journal of Mineralogical and Petrological Sciences

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Tellurium-bearing gold, silver, and base metal assemblages characterize the epithermal mineralization in southwestern Hokkaido, Japan. The telluride deposits in this district consist of quartz-filled fracture systems of Late Miocene to Pliocene age. Most of the telluride mineralization in southwestern Hokkaido consists of vein systems or are massive in form. The dominant host rocks for this deposit type are intermediate to acid volcanic rocks. The gangue and alteration minerals are very fine to fine-grained quartz, chalcedony, anatase, zeolite, sericite, barite, adularia, chlorite, smectite or other clay mineral, while carbonate (calcite and rhodocrosite) and Mn minerals are poorly represented and rarely coexist with tellurides. The country rocks suffered argillic and propylitic alterations, silicification, and kaolinitization. Tellurium-bearing mineralization is related to or coexists with sulfide and sulfosalt mineralization. The tellurides identified in the studied area consist of native tellurium, hessite, stutzite, petzite, sylvanite, calaverite, tellurobismuthite, tetradymite, Se-bearing tetradymite, tellurantimony, goldfieldite, altaite, coloradoite, tellurite, teineite, and poughite. The first crystallized telluride minerals such as native tellurium, stutzite, petzite, sylvanite and hessite are followed by calaverite, coloradoite, tellurobismuthite, tellurantimony, and altaite, indicating a decline in tellurium activity during telluride deposition with time. Microthermometry of fluid inclusions in quartz and barite indicate that the mineralization formed at moderate temperatures, ranging from 250-200°C with low average salinity (1.9-5.7 wt% NaCl equiv. ). The shift in mineralogy reflects decreases in temperature and fugacity of sulfur, with a concomitant increase in fugacity of tellurium. Further decrease in fugacity of tellurium (coupled with decreasing fugacity of sulfur) resulted in deposition of Au-Ag-Te and other tellurides.

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“…The Kobetsuzawa epithermal telluriferous gold‐bearing quartz deposit occurs as network veinlets in altered andesite and tuff of middle Miocene to Pliocene in age. The veinlets are composed mainly of fine quartz, calcite, sericite and clays with minor amounts of pyrite, sphalerite, chalcopyrite, native tellurium, altaite, hessite, tellurantimony and frohbergite (Ishibashi, 1956; Nakata et al ., 1985, 1989). Silicification, sericitization, and kaolinitization are found in the host rocks (Osanai et al ., 1956).…”

Section: Outline Of Geology and Ore Depositsmentioning

confidence: 99%

Chemistry and Occurrences of Native Tellurium from Epithermal Gold Deposits in Japan

Nakata

Komuro

2011

Resource Geology

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The chemistry and mode of occurrences of native tellurium in the epithermal gold ores from Teine, Kobetsuzawa, Mutsu, Kawazu, Suzaki and Iriki in Japan are examined. Mineral assemblages in contact with native tellurium are: quartz-sylvanite at Teine, quartz-hessite-sylvanite-tellurantimony at Kobetsuzawa, quartz at Mutsu, quartz-stutzite-hessite-sylvanite-tetradymite at Kawazu, quartz at Suzaki, and quartz-goldfieldite at Iriki. The peak patterns of XRD for native tellurium from these six ores are nearly identical to that of JCPDS 4-554. The ranges of associated minor compositions are consistent with those of the experimental phase. The differences would be related to associate minerals. The mineral assemblages in these ores agree well with the previously proposed experimental phase relations in Au-Ag-Te ternary system for 120-280°C. The Suzaki ore has high Te-Au assemblage: from calaverite-sylvanite-krennerite via native tellurium to petzite, with changing mineralization stage, whereas the Kobetsuzawa and the Kawazu ores have high Te-Ag assemblage of tellurium-hessite, and native telluriumstutzite-hessite-sylvanite, respectively. The Teine ore has intermediate assemblage of native tellurium-sylvanite. The mineral assemblages in the Au-Ag-Te system are related to the hydrothermal environment especially to the pH condition, i.e. Au rich assemblages under acidic and Ag rich assemblages under intermediate pH conditions, being supported by alteration mineral species. The other telluriferous epithermal gold deposits not in association with native tellurium such as Agawa, Date, Takeno, Chugu, Chitose, Sado and Kushikino are estimated to have been formed under higher pH conditions as adularia and calcite occur in these deposits. The pH-Eh diagram for aqueous tellurium species and tellurium minerals at 250°C indicates that the region of native tellurium occurs between those of aqueous telluride and tellurous species at lower pH, being consistent with their mineral assemblages in ores and alteration envelopes.

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Some Tellurium Minerals from the Kobetsuzawa Mine, Sapporo, Hokkaido.

Cited by 3 publications

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(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan

(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan

Ore–microscopy and Geochemistry of Gold–Silver Telluride Mineralization in Southwestern Hokkaido, Japan

Chemistry and Occurrences of Native Tellurium from Epithermal Gold Deposits in Japan

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Some Tellurium Minerals from the Kobetsuzawa Mine, Sapporo, Hokkaido.

Cited by 3 publications

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(Au, Ag)Te2Minerals from Epithermal Gold Deposits in Japan

(Au, Ag)Te2Minerals from Epithermal Gold Deposits in Japan

Ore–microscopy and Geochemistry of Gold–Silver Telluride Mineralization in Southwestern Hokkaido, Japan

Chemistry and Occurrences of Native Tellurium from Epithermal Gold Deposits in Japan

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(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan

(Au, Ag)Te₂Minerals from Epithermal Gold Deposits in Japan