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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (1): 34-45.doi: 10.11872/j.issn.1005-2518.2022.01.047

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

Primary Halo Characteristics of No.2 Ore Belt in Bilihe Gold Deposit，Inner Mongolia and Its Prospecting Significance

Wei WAN1(),Mingqi WANG2,Huihu FAN3,Libo ZUO4,Keke YANG2   

  1. 1.State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 300013, Jiangxi, China
    2.School of Earth Sciences and Resources, China University of Geoscience(Beijing), Beijing 100083, China
    3.Chinese Academy of Geological Sciences, Beijing 100037, China
    4.Tianjin Geological Survey Center, China Geological Survey, Tianjin 300170, China
  • Received:2021-04-13 Revised:2021-09-30 Online:2022-02-28 Published:2022-04-25

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Abstract:

Bilihe gold deposit is a large low-temperature hydrothermal and porphyry gold metallogenic system in the northern margin of North China Craton，which is hosted in internal and external contact zone of granodiorite and surrounding pyroclastic rock.The mining area has appeared a sharp drop of resource reserves due to continuous mining work.In order to ensure the sustainable development of the mine and improve the utilization rate of gold ore resources，there has arisen a critical necessity to strengthen geochemical exploration of deepand peripheral resources in the mining area.The primary halo prospecting method directly takes rocks or ores as the research target，which is considered to be the most direct and effective deep prospecting method at present and has achieved good results in the exploration of gold deposits.This paper take the mining No.2 ore belt as the research taget and analyze various elements such as Au，Ag，Cu，Pb，W，Mo，Bi，As，Sb，Hg of the primary halo of boreholes.The characteristics of element content，element association and spatial distribution of primary halo in three boreholes of No.2 ore belt in Bilihe mining area have been studied to find effective geochemical prospecting indicators.The results show that the main indicator elements of gold mineralization in Bilihe mining area are Au，W，Mo，As，Sb and Hg.There are two groups of gold metallogenic indicator element associations in Bilihe mining area，namely，Au-W-Mo high-temperature element association and Au-As-Sb-Hg low-temperature element association.Au-W-Mo element association indicates high-grade gold mineralization，strong gold mineralization activity and large metallogenic scale，which can be used as the main prospecting indicator for high-temperature porphyry gold deposits in the mining area.Au-As-Sb-Hg element association indicate low-grade gold mineralization，relatively weak gold mineralization activity and limited metallogenic scale，which can be used as the main prospecting indicator for vein-type low-temperature hydrothermal gold deposits in the mining area.Weak gold mineralization information can be obtained by applying 10×10-9 gold content as the lower limit of primary halo anomaly of gold deposits.The distribution range of gold mineralization can be accurately determined by applying 100×10-9 gold content as the inner zone of primary halo anomaly of gold deposits.The inner anomaly range of primary halo delineated by this method is much larger than the distribution range of gold orebodies.Therefore，Using primary halo prospecting method for deep prediction and evaluation can effectively enlarge weak information of gold mineralization.

Key words: Bilihe gold deposit, No.2 ore belt, primary halo prospecting method, element characteristics, deep prospecting, Inner Mongolia

CLC Number: 

  • P618.51

Fig.1

Geological map （a）（modified after Zhang et al.，2012）and geotectonic location map of Bilihe gold deposit（b）（modified after Ge et al.，2009）"

Fig.2

Profile map along No.0 exploration line of No.2 ore belt in the Bilihe gold deposit （modified after Tang et al.，2020）"

Table 1

Element content characteristics of primary halo in No.2 ore belt of Bilihe gold mine"

钻孔参数AuAgCuPbAsSbHgWMoBiNi
ZK007平均值4 415.1129.6165.528.275.811.8862.899.623.90.329.5
中位数2 293.097.4110.026.925.33.431.044.715.30.230.1
标准差6 133.6102.7150.46.8161.632.65 005.3122.923.10.38.2
变异系数1.40.80.90.22.12.85.81.21.01.20.3
ZK5101平均值18.479.453.820.584.72.828.22.62.70.2120.3
中位数4.674.351.118.331.12.511.82.11.90.2101.5
标准差35.429.428.210.4177.12.860.82.73.10.293.5
变异系数1.90.40.50.52.11.02.21.01.20.80.8
ZK8001平均值12.7100.117.433.6165.712.686.63.51.60.413.4
中位数6.084.712.422.290.59.99.01.31.20.24.5
标准差13.760.918.142.0197.912.2379.07.01.81.215.9
变异系数1.10.61.01.21.21.04.42.01.12.91.2

Table 2

Factor analysis results of primary halo in No.2 ore belt of Bilihe gold mine"

钻孔F1F2F3F4F5
ZK007Au、W、Mo元素组合Ag、Bi、Cu元素组合Hg、Sb元素组合As、Pb元素组合Ni元素
ZK5101Au、Sb、Ag、Hg元素组合Hg、As、Bi元素组合Cu、Ni元素组合Mo、Au元素组合W元素
ZK8001Pb、Ag、Cu元素组合W、Ni、Cu元素组合Hg、Sb元素组合Bi、As元素组合Au元素

Fig.3

Spatial distribution map of element content in ZK007 borehole"

Fig.4

Spatial distribution map of element content in ZK5101 borehole"

Fig.5

Spatial distribution map of element content in ZK8001 borehole"

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