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http://dx.doi.org/10.9719/EEG.2014.47.2.181

Mineralogy and Geochemistry of Carbonate Minerals from the Olon Ovoot Gold Mine, Mongolia  

Yoo, Bong Chul (Mineral Resources Department, Korea Institute of Geoscience and Mineral Resources)
Tungalag, Naidansuren (Mineral Resources Team, Mongolain Institute of Geology and Mineral Resources)
Sereenen, Jargalen (Department of Mineral Exploration, Mongolian University of Science and Technology)
Heo, Chul-Ho (Mineral Resources Department, Korea Institute of Geoscience and Mineral Resources)
Ko, Sang-Mo (Mineral Resources Department, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.47, no.2, 2014 , pp. 181-191 More about this Journal
Abstract
Olon Ovoot gold mine, Mongolia, is located in the Omnogobi province which is south 500 km from Ulaanbaatar. The mine area consists of the Devonian Bot-Uul khudag formation, the Upper Devonian intrusions, and the Upper Devonian or the Early Jurassic quartz veins. The quartz veins contain from 1 to 32 g/t gold with an average of 5 g/t gold. The quartz veins vary from 0.2 m to 25 m and are concordant or discordant with foliation of the green-schist. The mineralogy of the quartz veins is simple and consists of mainly of white massive quartz with partly transparent quartz in cavity. Quartz, sericite, chlorite, pyrite and carbonates(ankerite, dolomite and siderite) were observed in the alteration zone. Carbonate minerals occur as disseminated, coarse or fine grains with quartz, sericite, chlorite and pyrite near vein margin or within wall-rock xenoliths in quartz vein. Ankerite is present as later dark grey ankerite(13.51 to 16.89 wt.% FeO) and early white grey ankerite(16.67 to 19.90 wt.% FeO). The FeO contents of early ankerite are higher than those of later ankerite. Dolomite contains from 3.89 to 10.44 wt.% FeO and from 0.10 to 0.47 wt.% MnO. Dolomite is present as dark grey dolomite(4.06 to 6.87 wt.% FeO), light white grey dolomite(6.74 to 7.58 wt.% FeO) and grey white dolomite(7.33 to 10.44 wt.% FeO). The FeO contents of white grey dolomite are higher than those of dark grey dolomite. Siderite contains from 34.25 to 48.66 wt.% FeO, from 6.79 to 14.38 wt.% MgO, from 0.06 to 0.26 wt.% MnO and from 2.08 to 8.08 wt.% CaO.
Keywords
Olon Ovoot gold mine; mineralogy; geochemistry; wall-rock alteration; carbonate minerals;
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