Daizo Ishiyama
Akita University
82Publications
12H-index
386Citations
Publications 82
Newest
Published on Mar 1, 2019in Geochimica et Cosmochimica Acta 4.69
Yasumasa Ogawa12
Estimated H-index: 12
(Akita University),
Daizo Ishiyama12
Estimated H-index: 12
(Akita University)
+ 6 AuthorsScott A. Wood1
Estimated H-index: 1
(North Dakota State University)
Abstract In the Tamagawa geothermal area of Akita Prefecture, northern Japan, Obuki spring discharges a large amount of thermal water (∼9000 L/min), which is chloride-rich and acidic (pH 1.2). We have investigated changes in the physico-chemical nature and fractionation mechanisms of rare earth elements (REEs) including Y and actinides (Th and U) in the Shibukuro and Tama rivers into which acid thermal water from the Obuki spring discharges. The geochemical behavior of these elements is shown to...
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Published on Jul 1, 2018in Resource Geology 1.26
Quyen Pham (Akita University), Daizo Ishiyama12
Estimated H-index: 12
(Akita University)
+ 1 AuthorsYasumasa Ogawa12
Estimated H-index: 12
(Akita University)
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Published on Jun 1, 2018in Journal of Hazardous Materials 6.43
Baisui Han1
Estimated H-index: 1
(Akita University),
Batnasan Altansukh2
Estimated H-index: 2
(Akita University)
+ 8 AuthorsDaizo Ishiyama12
Estimated H-index: 12
(Akita University)
Abstract Sulfide copper mineral, typically Chalcopyrite (CuFeS 2 ), is one of the most common minerals for producing metallic copper via the pyrometallurgical process. Generally, flotation tailings are produced as a byproduct of flotation and still consist of un‒recovered copper. In addition, it is expected that more tailings will be produced in the coming years due to the increased exploration of low‒grade copper ores. Therefore, this research aims to develop a copper recovery process from flot...
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Hongbin Li1
Estimated H-index: 1
(Akita University),
Daizo Ishiyama12
Estimated H-index: 12
(Akita University)
+ 1 AuthorsYongjun Shao1
Estimated H-index: 1
(Central South University)
2 Citations Source Cite
Published on Feb 1, 2018in Aquatic Geochemistry 1.42
Yasumasa Ogawa12
Estimated H-index: 12
(Akita University),
Daizo Ishiyama12
Estimated H-index: 12
(Akita University)
+ 5 AuthorsScott A. Wood1
Estimated H-index: 1
(North Dakota State University)
This work assessed both the fractionation and the seasonal mobility variations of Ga and In in systems impacted by acidic thermal waters. This was accomplished by performing thermodynamic calculations using the PHREEQC algorithm and by assessing the activity of acidophilic iron-oxidizing bacteria. The pH of the Kusatsu thermal waters in Gunma Prefecture, central Japan, is rapidly increased following the addition of a lime suspension. After an abrupt pH increase, under which conditions free ions ...
1 Citations Source Cite
Published on Jun 1, 2018in Mineralium Deposita 3.37
Kofi Adomako-Ansah2
Estimated H-index: 2
(Akita University),
Daizo Ishiyama12
Estimated H-index: 12
(Akita University),
Rodney Allen13
Estimated H-index: 13
Adjacent to the world-class Boliden deposit, fine- to coarse-grained Zn-Pb-Sb-Au-rich sulfide-sulfosalt-bearing horizons occur within the base of a metasedimentary succession that has previously been regarded to stratigraphically overlie the Skellefte Volcanics and Boliden deposit. The metasedimentary succession comprises interbedded mudstone and normal-graded crystal-rich volcanic sandstone-siltstone units, interpreted to be low-density turbidity currents in a subaqueous environment below wave ...
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Published on Sep 1, 2018in Environmental Science and Pollution Research 2.80
Stefan Đorđievski (Akita University), Daizo Ishiyama12
Estimated H-index: 12
(Akita University)
+ 1 AuthorsZoran Stevanović1
Estimated H-index: 1
Bor, Krivelj, and Bela Rivers belong to the watershed of Timok River, which is a tributary of transboundary Danube River. These rivers receive metal-rich acidic wastewater from metallurgical facilities and acid mine drainage (AMD) from mine wastes around Bor copper mines. The aim of this study was to determine the mobility and natural attenuation of metals and arsenic in rivers from Bor copper mines to Danube River during the year 2015. The results showed that metallurgical facilities had the la...
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Published on Oct 1, 2017in Ore Geology Reviews 3.99
Kofi Adomako-Ansah2
Estimated H-index: 2
(Akita University),
Toshio Mizuta9
Estimated H-index: 9
(Akita University)
+ 1 AuthorsNapoleon Q. Hammond2
Estimated H-index: 2
(University of Limpopo)
Abstract Orogenic gold mineralization in the Amalia greenstone belt is hosted by oxide facies banded iron-formation (BIF). Hydrothermal alteration of the BIF layers is characterized by chloritization, carbonatization, hematization and pyritization, and quartz-carbonate veins that cut across the layers. The alteration mineral assemblages consist of ankerite-ferroan dolomite minerals, siderite, chlorite, hematite, pyrite and subordinate amounts of arsenopyrite and chalcopyrite. Information on the ...
2 Citations Source Cite
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