·The Hadamengou gold deposit is located in the western segment of the northern margin of the North China Craton NCC It is hosted by Archean metamorphic rocks of the Wulashan Group The main ore types include gold bearing quartz vein type gold bearing quartz potassic feldspar vein type and gold bearing altered rock type Gold mineralization is closely
Most of the world s gold ore mining currently takes place in Russia and South Africa Major gold rushes took place in the 19th century in New Zealand and Australia Brazil Canada South Africa and the United States notably California Gold rushes extend as far back to the Roman Empire and probably as far back as Ancient Egypt Types of
·The Oyu Tolgoi cluster of seven porphyry Cu Au Mo deposits in southern Mongolia define a narrow linear 12 km long almost continuously mineralised trend which contains in excess of 42 Mt of Cu and 1850 t of Au and is among the largest high grade porphyry Cu Au deposits in the world
·The Boroo gold deposit located in northern Khentei gold ore belt is the first hard rock gold deposit discovered in Mongolia and its scale of mining and the gold production are also the largest averagely /t gold with total produced gold reaching 66t The deposit is hosted in the Boroo fault a nearly flat lying fault zone The total combined length of the mineralization
·It is advisable first of all to examine the ore for visible gold and silver the presence of which might influence the choice of a method of treatment If no gold or native silver can be seen in the rock take a representative sample of
·In hard rock gold mines As was enriched and the contribution of Factor 1 was high % due to the affinity between As and Au Ore grades range up to wt% Cu Grassland fires and
·The Khangai Khentii basin in the north central Mongolia was the part of the Mongol Okhotsk Ocean and separated by a northwest fault system into Khangai basin in the west and Khentii basin in the east Fig 2 Zonenshain et al 1990 Sengor and Natal In 1996 Badarch et al 2002 Kelty et al 2008 It mainly consists of Devonian to Carboniferous turbidite
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· Placer Gold Deposits Placer gold deposits are common in Mongolia Cenozoic age loose sediments are the prime targets Moreover ancient placer deposits of Carboniferous Permian Jurassic Triassic and Cretaceous rocks are also present some of which are identified to have intermediately sourced from Jurassic and Cretaceous gold bearing
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