著者

太田 英順

出版者

The Society of Resource Geology

雑誌

鉱山地質 (ISSN:00265209)

巻号頁・発行日

vol.39, no.218, pp.355-372, 1989

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豊羽銀鉛亜鉛鉱床には錫・銅と共にインジウムが存在する.ビスマス,タングステン,アンチモン,砒素,コパルトも微量ながら広範囲に分布する.インジウム鉱物としては閃亜鉛鉱とインジウム銅鉱の中間組成を有する亜鉛インジウム鉱物,AgInS<SUB> 2</SUB>の組成を有する銀インジウム鉱物,インジウム銅鉱,櫻井鉱が産するが,ケステライト,黄錫鉱,閃亜鉛鉱,異方性を有する黄銅鉱もかなりの量のインジウムを含む,これらのうち経済的に最も重要なのは亜鉛インジウム鉱物と含インジウム閃亜鉛鉱で,次いでケステライト,黄錫鉱,含インジウム黄銅鉱である.含インジウム閃亜鉛鉱は亜鉛インジウム鉱物と閃亜鉛鉱の固溶体であることが判明した.また,インジウム銅鉱と亜鉛インジウム鉱物,ケステライトと亜鉛インジウム鉱物それぞれの間にも広い固溶体の存在が認められた.これらの固溶体は2(Zn, Fe)とCuIn,(Zn, Fe)InとCuSnの置換によるものである.黄銅鉱と黄錫鉱間の固溶体では(Fe<SUP> +2</SUP>, Zn)Snと2Fe<SUP> +3</SUP>,黄錫鉱またはケステライトとインジウム銅鉱間では(Fe<SUP> +2</SUP>, Zn)Snと2Inの置換がそれぞれ主なものである.上記の鉱物の産状は,今まで見積られていた豊羽鉱床の最高生成温度(300℃)よりも50から100℃高い温度でこれらの鉱物が晶出したことを裏付ける.

著者

三宅 輝海

出版者

The Society of Resource Geology

雑誌

鉱山地質 (ISSN:00265209)

巻号頁・発行日

vol.38, no.209, pp.215-231, 1988

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下川火山成塊状硫化物鉱床は126Maにクラ・イザナギおよびファラロン両プレート間の中央海嶺部に生成した.拡大軸における,循環海水に起因する熱水系が海底変成作用およびそれに引続く鉱化作用をもたらした.鉱床が沈澱している間に double diffusive 現象により塊状鉱および縞状鉱が形成された.鉱床は恐らく珪質の exhalite ないし熔岩により覆われたが,引続くテクトニックな運動により剥ぎ取られたものと思われる.日本海が開く前であったので鉱床を含む海洋地殻は海溝に近づくにつれ,シホテアリンの火山帯から供給されたタービダイトにより覆われた.日高累層群の堆積物および海洋地殻は斜め沈み込みに伴い,シートダイクの部分等がはぎ取られた.この付加体プリズムの一部が下川テクトノストラティグラフィック・ユニットとして知られ,複雑に変形した堆積物やメラソジェ帯によって特徴づけられる.下川鉱床はこのテクトニックな方向にほぼ平行に,連続して胚胎している.新生代の日本海の拡大に伴い,この下川複合岩体は現在の北海道日高帯に移動した.九州の槙峰,浅川両鉱床も同様な異地性起源と考えられる.

著者

神山 貞二

出版者

The Society of Resource Geology

雑誌

鉱山地質 (ISSN:00265209)

巻号頁・発行日

vol.19, no.93, pp.43-60, 1969-03-18 (Released:2009-12-14)

参考文献数

10

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The Atomic Fuel Corporation (AFC) was resolved and was newly incorporated as a new governmental corporation, the Power Reactor and Nuclear Fuel Development Corporation (PNC) in October, 1968. The main purpose of PNC is to develop within ten years the prototype reactors of the Advanced Thermal Reactor (ATR) and the Fast Breeder Reactor (FBR) suitable for Japan. These reactors are expected to solve the energy problem of Japan in around 2000. The uranium is not fully used in the light water reactors now being built in Japan. The uranium will be fully used as fuel resources only when we succeed in building, for our electricity generating system, the ATR with greater. conversion ratio of Pu and the FBR to be operated with plutonium. In other words the development of the ATR and the FBR is the solution of the problem of uranium resources.If we build only the light water reactors, we need 500, 000t of uranium by 2000. But if the FBR can be introduced in and after 1980, 300, 000t of uranium would be enough.The result of prospecting carried out by AFC for last ten years proved the uranium deposits of only 6, 000t (U3O8) which is not able to meet the domestic demand for power plants. Therefore, most of the uranium must be procured from abroad. Under these circumstance, it is very important to study the world situation of uranium and make a plan not only for the purchase of uranium but also for the prospecting and development of uranium mines abroad.1. History of Uranium Resources DevelopmentAfter World War II, many countries have promoted the development of uranium resources as the strategic materials under the government subsidies. The uranium resources in Australia and South Africa have been rapidly developed with the propping-up from the United Kingdom and U.S.A. through Combined Devlopment Agency (CDA). As a result, the uranium production of the Free World reached 43, 000t (U3O8) in 1959. Thereafter, the uranium mining activities have been slowed down with the mitigation of cold war and the unexpected slow development of civil uses of nuclear power. However, the uranium prospecting activities have been activatéd again since the economic prospect of nuclear power was proved at the Third International Conference on the Peaceful Uses of Atomic Energy held in Geneva in 1964.2. Classification of Uranium DepositThe uranium deposit will be classified in the following manners by genesis and mode of occurrences_a) Sedimentary typeThis type includes most of the uranium resources now under development such as the Elliot Lake area in Canada and Witwatersrand in South Africa which of the Proterozoic and Colorado Plateau, Wyoming and Texas which belong to the Mesozic and the Tertiary. The uranium occurs in some cases in black shale such as Chattanooga shale (Tennessee) and Alum shale (South Sweden) and also sometimes in phosphorite rocks as in Florida.b) Vein typeThe uranium occurs in the veins as a main ore mineral in fractured zone in Beaverlodge (Canada), South Alligator (Australia), La Crouzille (France). It is associated with Ni, Co, Au, Ag, Cu in Shinkolobwe (Congo) and Jachymov (Czeckoslovakia).

著者

伊藤 和男 高階 和郎 杉山 輝芳

出版者

The Society of Resource Geology

雑誌

鉱山地質 (ISSN:00265209)

巻号頁・発行日

vol.35, no.190, pp.119-132, 1985-04-30 (Released:2009-06-12)

参考文献数

17

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Recent exploration efforts in the Akenobe Mine has lead the discovery of Chiemon Vein Swarm in the South-western deeper levels of the mine. This vein swarm, consisting of more than forty blind veins, develops mainly below -10 level except No. 5 vein and is formed in the tension fractures of basic lava, basic tuff and slate of the upper Permian Maizuru Group.No. 4 vein, the champion of the swarm, trends NW-SE and dips steeply to the north having strike and dip extension of over 470 m and 200 m, respectively. Most of the other veins, with lesser extension, follow almost similar NW-SE direction, and distribute around this champion vein as branch or parallel veins. Vein fractures are much more developed in basic lava of brittle nature, whereas they are less developed in basic tuff or slate of relatively ductile nature.The occurrences of principal veins show multiple mineralization which are summarized into Cu-Zn, Sn-W and barren quartz from early to later stages.Among these three stages, the distribution of Sn-W stage is limited in No. 4 Vein and Veins of its closest proximity.Current ore reserve calculation from this vein swarm totalled about 1.6 million tons of minable ore, averaging 1.42% of copper, 5.75% of zinc and 0.34% of tin, and still this figure has a very good possibility of remarkable increase as the exploration goes on.In addition, the discovery of this vein swarm proposed us a several new concepts on our exploraiton philosophy which would be extensively applied in the other area of the mine to disclose another blind vein swarms.

著者

寺島 進世意 鎌田 治郎 土屋 徹

出版者

The Society of Resource Geology

雑誌

鉱山地質 (ISSN:00265209)

巻号頁・発行日

vol.30, no.162, pp.211-227, 1980

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Metal Mining Agency of Japan (MMAJ) had carried out a systematic exploration program for regional mineral resources in the Bantan district, western Japan, using geologic, gravimetric, aeromagnetic and drilling methods, during a period of about seven years from 1971. The district embraces one of the major metallogenic provinces in this country, where famous polymetallic vein deposits of Ikuno and Akenobe are known.<BR>Although there are many exposures of magnetic body and high density body which are expected to cause magnetic and gravimetric anomalies in the district, the solutions derived from the conventional analysis of the data could not disclose the proper geologic boundaries because many anomalies of different wave-length and amplitude interfere each other to form composite anomalies.<BR>The authors reexamined the gravimetric data with the manual bandpass filtering process (TERASHIMA and TsucHIYA, 1976a, b; TERASHIMA and YOSHIZAWA, 1976; TERASHIMA et al., 1979) and clarified the subterranean geologic structure that is quite consistent with the surface geology. A remarkable conclusion of the new analysis is the existence of a relatively shallow, mostly hidden emplacement of granitic batholith in the central district, along the periphery of which major Sn- and W-bearing polymetallic mineralizations such as Akenobe-Ohmidani, Kawakami and Ikuno seem to occur.<BR>The aeromagnetic data were also reexamined with special attention to the distribution pattern of pair (positive and negative) anomalies of the second vertical derivatives and of pair (high and low) anomalies of the total magnetic field. The detailed magnetic structure thus obtained succeeded to delineate the distribution of granodioritic intrusives which have genetic relation to Mo-bearing mineralization in the district.

著者

青木 義和 肥田 昇

出版者

The Society of Resource Geology

雑誌

鉱山地質 (ISSN:00265209)

巻号頁・発行日

vol.24, no.125, pp.201-211, 1974-06-30 (Released:2009-06-12)

参考文献数

23

被引用文献数

4

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Mihara mine, Hiroshima Prefecture, had been exploited for dissemination fluorite deposits in skarn and monzonite. Rocks of this area consist of Paleozoic limestone, chert and diabasic rocks intruded by Cretaceous biotite granite. The Paleozoic formation is thermally metamorphosed and metasomatised by the granite which is partly monzonitised. Fluorite ores occur in the monzonite and adjacent skarns.Recently presence of beryllium mineralization in this ore deposit was discovered with a beryllium detector. The mineralization occurs mostly in the monzonite and partly in the scheelite-feldspars-fluorite-iron-rich biotite skarn. The beryllium mineral contained in the skarn is exclusively phenacite which coexists with iron-rich biotite, plagioclase and potassium feldspar, filling the grain boundaries of fluorite crystals. A small amount of scheelite is also found in association with the minerals. On the other hand, danalite is the main beryllium mineral in the monzonite. It occurs as disseminated grains of euhedral or subhedral form, and is associated with violet fluorite and feldspars. Phenacite is also present in a trace amount. It is conspicuous that these phenacites are always corroded along cleavages and cracks, and also surrounded by danalite grains.Volumetric analyses of constituent minerals in thin sections by a point counter reveal that (1) danalite and phenacite are found in specific monzonite which contains fluorite and quartz more than 5.6% and less than 2.3%, respectively; (2) the quantity of modal danalite in such rocks ranges from 2.5% to 3.6%, and that of phenacite is less than 0.4%; and (3) the amount of quartz gradually decreases towards the adjacent skarn body, while total feldspars and fluorite increase in contrast. The degree of Al/Si order-disorder and the Or contents in potassium feldspars in biotite granite and monzonite were determined with powder X-ray diffractometry. Potassium feldspars in biotite granite have a tendency to become ordered and rich in Or component with coming close to monzonite, and the maximum ordering and Or contents are encountered where they coexist with danalite in monzonite. These results are correlative with the modal analysis data.From the results obtained, the genesis of this beryllium ore deposit may be summarized as follows : (1) Paleozoic rocks were partly metasomatised by the intrusion of Cretaceous biotite granite. (2) Migration of silica from the granite to the adjacent skarn body caused relative increases of alkali and alumina contents in peripheries of the granite, converting them to monzonite. (3) Only a small portion of beryllium contained in the granite could have moved to the skarn body to form phenacite at a limited part of the skarn. (4) The main portion of beryllium was precipitated as danalite crystals within the monzonite.

著者

尾関 規

出版者

The Society of Resource Geology

雑誌

鉱山地質 (ISSN:00265209)

巻号頁・発行日

vol.11, no.45-46, pp.142-146, 1961-03-25 (Released:2009-06-12)

参考文献数

9

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The Gojo Mine is located southeast of Koya-san. The ore deposits are bedded cupriferous pyritic ones and their host rocks belong to the undifferentiated Mesozoic group which consists of shale, sandstone and green rock.In the vicinity of the mine, black shale is alternated with green rock or chert, forming a complex zone. The distribution of mineralized zone is closely related to the micro-basin structure of the complex zone.

著者

宮久 三千年 原田 進造 石橋 澄 渋谷 五郎 本村 慶信

出版者

The Society of Resource Geology

雑誌

鉱山地質 (ISSN:00265209)

巻号頁・発行日

vol.25, no.133, pp.347-357, 1975-10-31 (Released:2009-06-12)

参考文献数

17

被引用文献数

1

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In this paper, the paragenesis of minerals in the Hoei mine is presented with some remarks on the mineralogical properties of kutnahorite.The Ichigo (no.1) ore body of the Hoei mine is a massive deposit of Sn, Zn and iron sulfide formed by replacement of the Silurian limestone bed. From this ore body, there have been found various kinds of ore and gangue minerals such as: garnet, clinopyroxene, axinite, tourmaline, vesuvianite, quartz, pyrrhotite, chalcopyrite, arsenopyrite, pyrite, marcasite, sphalerite, galena, native bismuth, herzenbergite, franckeite, jamesonite, cassiterite, stannite, malayaite, fluorite, sericite and carbonate minerals. The species of carbonate minerals are ferromanganoan dolomite, magnesian kutnahorite, kutnahorite, calcian rhodochrosite, ferroan magnesite and manganoan calcite, and they have been crystallized at the later stage of mineralization in this mine.The kutnahorite in this mine is white, yellow or pinkish in color, and platy or leaf-like in external shape, reaching to 5 cm in maximum length. Its specific gravity ranges from 2.98 to 3.18 by picnometer method. Optically negative, and some examples of refractive indices are ω=1.717-1.731, ε=1.524-1.529. Unit cell constants, a0 = 4.861-4.869 Å, c0=16.24-16.37 Å. The range of chemical composition of kutnahorite is fairly wide, as shown in Table 4 and 5.Judging from the mode of occurence, microscopic observations and the compositional changes detected by EPMA, the crystallization sequence of the carbonate minerals is suggested as follows : dolomite-ferromanganoan dolomite-magnesian kutnahorite-kutnahorite-calcian rhodochrosite-manganoan calcite.

著者

森下 祐一 寺岡 易司

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.46, no.4, pp.189-195, 1996-08-31

参考文献数

32

被引用文献数

2

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This paper determines the location of the Butsuzo tectonic line (boundary between the Chichibu and Shimanto terranes) in the Kushikino area, southwestern Kyushu. Many epithermal gold deposits including the Kushikino and Hishikari de-posits occur mainly as veins in andesitic volcanic rocks in the Hokusatsu gold district, where basement rocks are rarely exposed.<BR>Drill hole 61MAHT-1, which is situated at Hashima in the Kushikino area, penetrates volcanic rocks, and reaches sedimentary rocks of the basement. Modal analysis of sandstone samples from drill hole 61MAHT-1 revealed that they are lithic wackes, rich in chert fragments and poor in quartz and feldspar. The sandstones are different in modal composition from those of the Shimanto terrane, however, they are similar to those of the Sambosan belt of the Chichibu terrane.<BR>The basement sedimentary rocks for most gold deposits in the Hokusatsu gold district are of the Northern Shimanto terrane (Saiki Subbelt), while the basement at Hashima proved to belong to the Sambosan belt. This is a possible reason why the δ<SUP>13</SUP>C values and REE patterns of hydrothermal veins in the Hashima area are slightly different from those in the Kushikino mine area.

著者

太田垣 亨

出版者

The Society of Resource Geology

雑誌

鉱山地質 (ISSN:00265209)

巻号頁・発行日

vol.20, no.101, pp.222-236, 1970-07-11 (Released:2009-06-12)

参考文献数

23

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The epithermal ore deposit of Numanoue and Takatama Mine which has been worked mainly for gold and silver is thought to have deposited following continuous igneous activities, while the epithermal ore deposits of Oe and Kinkaseki Mines which have been worked principally for base metals accompanying gold and silver are understood to have deposited after geological structure movements.In this paper, the writer would present a report for these mines in regard to the following:i)The location where mineralization occurred.ii)The relation between first stage mineralization (rock alteration stage) and igneous activities.iii)The sequence of gangue and ore minerals.iv)The correlation among various stages of repeated mineralization.The mineralization appears to have repeated in all of these cases, but judging from the sequence of gangue minerals, ore minerals and minor elements, the mineralization in the cases of Takatamaa and Oe Mines is thought to have repeated from the identical ore magma while in the cases of Numanoue and Kinkaseki it is thought to have repeated from the different one.In all of these ore deposits, gangue and ore minerals of low, middle and high temperatures occur in paragenetic form showing a xenothermal tendency which is also true in the case of minor elements.In conducting a more detailed study on the sequence of gangue minerals, ore minerals and minor elements of these ore deposits hereafter, a consideration necessary should be on their geochemical and geophysical conditions.

著者

津末 昭生 石原 舜三

出版者

The Society of Resource Geology

雑誌

鉱山地質 (ISSN:00265209)

巻号頁・発行日

vol.24, no.123, pp.13-30, 1974-03-04 (Released:2009-12-14)

参考文献数

42

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The iron-titanium oxides in the granitic rocks of Southwest Japan have been examined under the microscope and analyzed with the electron probe micro-analyzer. Ilmenite containing up to 4 mole percent hematite molecule is almost sole iron-titanium oxide present as an early accessory constituent of the granitic rocks in the Outer zone, Ryoke zone, and Sanyo. Naegi zone of Southwest Japan. While, magnetite, magnetite intergrown with ilmenite, and hemo-ilmenite containing up to 20 mole percent hematite molecule are present as early accessory constituents in the Sanin-Shirakawa zone.From the chemical composition of the granitic rocks of Southwest Japan, it is suggested that the granitic magmas in the Sanin-Shirakawa zone were more oxidized than those in other three zones.Residual ilmenite sand deposits derived from gabbroic rocks are found only in the Ryoke zone, while residual magnetite sand deposits originated in granitic rocks are found only in the Sanin-Shirakawa zone. Thus, the distribution of residual iron sand deposits well corresponds to the generalization stated above.