Integrated Geophysical and geochimestry investigations at the Ondurnaran lode gold deposit
Abstract
Undurnaran deposit (1090 34’ 23.1 E, 440 40’ 51.7” N) locates in Saikhandulaan soum of Dornogovi province. Detailed geological prospecting work using scale of 1:10000 was carried out from 2009 up to 2011. Mineralization of the Undurnaran deposit is related to Upper Carboniferous Gunbayan formation volcanogenic-sedimentary rocks and Late Carboniferous Mandakh complex diorite. Microquartzite, quartzite and carbonate veins contain gold micrograins. Sometimes gold is included in meta-andesite and diorite. Alteration zone with a little arched form directs from southeast to northward. Size of the alteration zone is ranging from 20 meters up to 30 meters in wide and its length continues approximately 500 meters. Gold grade reaches approximately 3.5-4.5 g/t within mineralization zone. Gold mineralization is mainly controlled by Saikhandulaan abyssal fault which continues from northeast to southwest.
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