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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (5): 648-658.doi: 10.11872/j.issn.1005-2518.2019.05.648

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

Prospecting Direction of Jiama Super-large Porphyry Metallogenic System in Tibet

Zhengkun YANG1(),Tianwei XING2,Zhongkun ZHANG1,Bin LIN3,Pan TANG4,Jian HE1,Zhengbaisang CI1,Haijun JIAO1,Yang YANG4,Chunneng WU4,Xin WU4   

  1. 1. Tibet Huatailong Mining Development Co. ，Ltd. ，Lhasa 850212，Tibet，China
    2. China Gold Group Co. ，Ltd. , Beijing 100011，China
    3. MNR Key Laboratory of Metallogeny and Mineral Assessment，Institute of Mineral Resources，CAGS，Beijing 100037，China
    4. School of Earth Science，Chengdu University of Technology，Chengdu 610059，Sichuan，China
  • Received:2018-12-21 Revised:2019-06-19 Online:2019-10-31 Published:2019-11-07

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Abstract:

Jiama deposit is located in Gangdese metallogenic belt，Tibet，with high level of study and exploration.The deposit is composed of porphyry orebody，skarn orebody，hornfel orebody and peripheral independent gold orebody，as multi-unit orebody structure.The ore-forming elements included copper，molybdenum，lead，zinc，gold and silver，with ploymetallic mineralization features.In recent years，under the guidance of the theory of porphyry mineralization system，great breakthroughs have been made in the deep and peripheral mining areas.According to the latest exploration，the total copper resources （reserves） discovered in the Jiama is over 8.5 million tons，and 910 thousand tons of molybdenum，1.5 million tons of lead and zinc，220 tons of associated gold and 10 thousand tons of associated silver have been discovered in Jiama，as a super-large or giant deposit.This paper aims to reveal the regional and peripheral prospecting directions，which are useful to do the further exploration，based on the latest exploration results.The geological structure of these orebodies in different sections of Jiama，have been systematically dissected via drilling core logging and alteration and structure mapping. At the same time，combining with newly two discoveries，a large thick skarn orebody in the main ore segment and the outlying large porphyry orebody in the North-Zegulang segment，the prospecting potential in the deep and periphery of Jiama has been analyzed synthetically. The high-grade Cu （Mo） skarn orebody and low-grade Mo porphyry orebody were most important target for the deep exploration in the main ore segment，and new porphyry，skarn and hornfel orebodies would been found during the further exploration works. They were helpful to create some effective exploration methods and provided some good suggestions for further study of ore-forming process and established a comprehensive exploration model of Jiama giant deposit. In addition，after systematic analysis of existing exploration and research data，combined with the latest exploration and research results，we summarized some prospecting indicators of Jiama deposit and provided some important clues for further exploration of similar deposits in the same region.These works will construct good foundation for exploration and research of the porphyry mineralization system in the Qinghai-Tibetan plateau.

Key words: porphyry metallogenic system, mineral deposit, deep exploration, prospecting indicators, comprehensive prospecting model, Jiama deposit, Gangdese, Tibet

CLC Number: 

  • P618.51

Fig.1

Tectonic map of the Jiama deposit[1] "

Fig.2

Geology and mineralization element plane zoning map of Jiama deposit[33] "

Fig.3

3D model of orebody in the Jiama deposit[14] "

Fig.4

Section map of No.8 exploration line in the Jiama deposit[33] "

Fig.5

Typical mineralization characteristics in the new exploration achievements"

Fig.6

Schematic model of Jiama porphyry metallogenic system[14] "

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