Citation: | CHEN Long, ZHAO Yuanyi. The progress in the study of the Boroo gold deposit in Mongolia[J]. Geological Bulletin of China, 2017, 36(1): 112-126. |
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 3.52g/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 zone (anomalous gold values≥100ppb) is more than 2500m, the width is at least 400m, and the thickness is locally as large as 100m. This area is underlain by granitoids of the Boroo Complex and metasedimentary rocks. Two main types of mineralization have been recognized in the Boroo gold deposit:the gold-sulfide type and the gold-quartz vein type. A comparison of the Boroo deposit with China's Jinshan gold deposit shows that there exist many similarities between these two deposits, and hence the authors consider that the Boroo gold deposit is an orogenic gold deposit. Meanwhile, there is another large-sized gold deposit called Gatsuurt gold deposit 35km away from the Boroo deposit, which shares the same deposit type and equal ore reserves. On the basis of previous researches, the authors have made a detailed summarization in the aspects of production environment, geological characteristics, and genesis of the deposit. This paper provides useful information for Chinese companies' prospecting for the same type gold deposits; in addition, three strategic targets in the adjacent areas of Boroo have been delineated.
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The variation of reserves/resources and production of the Boroo gold deposit
Geographical location of the Boroo gold deposit
Major tectonic elements of north-central Mongolia showing the location of the Boroo gold deposit
Geological map of the Boroo deposit with reserve pit footprints and interpretive section through Pit3 (a) and grade thickness, showing dominant northeast and northwest structural framework of the ore district (b)
Metallogenic model of the Boroo deposit
Paragenetic sequence of ore minerals in the Boroo deposit
Histograms of selected elements (logs)
Histogram of homogenization temperatures of the primary fluid inclusions in quartz of the disseminated and stockwork ores of the main and central zones
The Plateau age data