Hydrothermal Gold Mineralization and Structural Controls near May Hibey, Northwestern Tigray, Northern Ethiopia

  • Mickiale Giday
  • Bheemalingeswara Konka
Keywords: Quartz veins, Shear zones, Gold, Petrography, Geochemistry, MayHibey, Ethiopia.

Abstract

Ezana Mining Development Company has recently reported presence of gold mineralization near May Hibey area, western Tigray, northern Ethiopia. It is in association with hydrothermal quartz veins within the Neoproterozoic low grade basement rocks, metavolcanics and metasedimentary rocks. Structural data suggests four phases of deformations and NE-SW trending foliation is the prominent one among others. Among different generations of veins, NNE, NS and NNW trending third generation quartz veins are gold-bearing and presence of a narrow shear zone with dextral sense of movement trending NW-SE is significant interms of mineralization. Hydrothermal alterations are dominated by chloritization and sericitization. Core samples from shear zone within the sericite-quartz schist and quartz porphyry rocks shows presence of pyrite, pyrrhotite, sphalerite, chalcopyrite, galena and gold in decreasing order of abundance. Gold mineralization is closely associated with the sericite and carbonization alteration zone. Based on mineral association, alteration, deformation, texture, and paragenetic scheme, it is suggested that the mineralization is a syn-orogenic variety formed in an island arc tectonic setting.

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References

Alene, M., Ruffini, R & Sacchi, R. 2000. Geochemistry and geotectonic setting of Neoproterozoic rocks from northern Ethiopia (Arabian-Nubian Shield). Gondwana Research,3: 333-347.
Aspermont, UK. 2011. Ethiopia facts and proud independence. Albert house, 1 singer street London EC2A 4BQ. Mining journal special publication, Ethiopia, 15p.
Asrat, A., Barbey, P & Gleizes, G. 2001. The Precambrian Geology of Ethiopia: A review. Africa Geoscience Review, 8: 271-288.
Barrie, C. T., Nielson, F. W & Claude, H. 2007. The Bisha, volcanic-associated massive sulfide deposit, Western Nakfa terrane, Eritrea. Society of Economic Geologists, Inc. Economic Geology, 120:717-738.
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Published
2018-06-07