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Gold Science and Technology ›› 2013, Vol. 21 ›› Issue (4): 54-59.

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Geophysical Characteristics and Prospecting Model of Nangetan Mining Area in Qinghai Province

CHEN Ruilin1，MA Dexi1，CHEN Fangbo1，2，LI Wenliang1，CHEN Xiaoqiang1，WANG Chunsheng1   

  1. 1.Gold Geological Institute of CAPF，Langfang   065000，Hebei，China；
    2.Geological University of China，Beijing   100083，China
  • Received:2013-04-22 Revised:2013-06-23 Online:2013-08-28 Published:2014-01-26

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Abstract:

The Nangetan mine located in the southeast of Qaidam Basin in Dulan County，Qinghai Province，is a skarn type iron-based multi-metal deposits related to diorite porphyry.The mineral deposit can be divided into two ore belt areas，north area and south area，by diorite porphyrite dikes.Ore bodies occur in the fracture altered zone，and the outputs of diorite porphyrite veins，skarnization belt，orebody and fault are consistent.Through the measuring and the statistics of the magnetic and electrical parameters of the different rocks and ores，what was known is there is the strongest magnetic，highest polarization rate and the lowest resistivity for the ore bodies，while lower magnetic and polarization rate and higher resistivity for surrounding rock.The differences between the ore bodies and surrounding rock are obviously，and it is the physical foundation for the works of magnetic method and electrical method in this area.In recent years，the author carried out the works of 1∶10 000 magnetic method and IP method in mine sweeping surface，and delineated three magnetic anomaly areas and one IP anomaly area.By setting up three SIP spectral IP sounding profile in the areas where overlapped by the magnetic and the electric anomaly.Then，three SIP polarizability anomalies areas，with abnormal trend of northeast and the tendency of nearly erect，were delineated.The drilling results show that the anomaly of SIP polarization caused by the ore body (mineralization)，and the anomaly of the ore’s （mineralized bodies） SIP resistivity showed different anomaly in resistance.High resistivity anomalies may be caused by the rejection of the current in the fractured ore，so the performance of resistivity anomaly is not necessarily low resistance.Based on the prospecting effect of geophysical prospecting in Nangetan mine， the model for searching the polymetallic deposit dominated by iron in Nangetan and the surrounding areas was proposed：using magnetic method and IP intermediate gradient for 1∶10 000 scanning to delineat the anomaly of the magnetic and the IP，then setting up SIP spectral IP sounding profile in the land surface areas where overlapped by the magnetic and the electric anomaly，measuring profile plumb with the magnetic anomaly and the IP anomaly areas.Finally，delineating polarization anomaly of the SIP section，and revealed the project.

Key words: polarizability, resistivity, SIP spectral induced polarization, physical characteristics, prospecting model, Nangetan, Qinghai Province

CLC Number: 

  • P618.51

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