Integrated geophysical exploration for the Longtoushan Ag-Pb-Zn deposit in the southeast of the Da Xing’an Ling mountains, Inner Mongolia, northern China
Weijun Chen 1 2 3 4 Hongtao Liu 1 Jianming Liu 1 Xingguo Sun 1 Qingdong Zeng 1
+ Author Affiliations
- Author Affiliations
1 Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
2 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
3 Mineral Resource Institute of China Metallurgical Geology Bureau, Beijing 10025, China.
4 Corresponding author. Email: chenweijun@mail.igcas.ac.cn
Exploration Geophysics 41(4) 279-288 https://doi.org/10.1071/EG09041
Submitted: 17 September 2009 Accepted: 25 October 2010 Published: 15 December 2010
Abstract
Geophysical and geological studies attempting to search and explore new mineralisation resources were carried out in the Longtoushan area, Inner Mongolia, northern China. The Longtoushan area is located within a large alteration zone, which is covered by a variety of altered lava, bioclast limestone and Quaternary sediments. In this case study, ground geophysical surveys played an important role in defining the mineralised structures beneath Quaternary sediment cover. The aim of this study was to investigate the subsurface mineralisation in the area using a combination of very low frequency electromagnetic (VLF-EM), Stratagem EH4 and controlled source audiofrequency magnetotelluric (CSAMT) measurements. These successful surveys in the area revealed that the VLF, Stratagem EH4 and CSAMT methods were effective in detecting the unseen mineralised system and results from the different methods confirmed each other. VLF measurements at 2875 stations along 35 lines identified the principal mineralised shear system as two sub-parallel linear conductive belts, tracing the principal mineralised system for a further 650 m of strike length beneath cover loess, in a NW–SE-trending direction. The subsequent Stratagem EH4 soundings along four parallel traverses perpendicular to the mineralised trend indicated that the principal mineralised shear structure, extending for more than 600 m in the dip direction, was almost vertically dipping above the 200 m level but changed to the SSW direction at a steep angle at depth. A CSAMT survey on two lines confirmed that the ore-bearing mineralised zone was a conductive belt and contained a low resistivity anomaly of less than 500 Ωm.
Keywords: CSAMT, integrated geophysical survey, Stratagem EH4, VLF-EM.
References
Baolian, S., Huabin, C., and Qinghua, Y., 1986, Low Frequency Electromagnetic Method: Geological Publishing House.Bayrak, M., 2002, Exploration of chrome ore in Southwestern Turkey by VLF–EM: Journal of the Balkan Geophysical Society, 5, 35–46
Benson, A. K., Payne, K. L., and Stubben, M. A., 1997, Mapping groundwater contamination using DC resistivity and VLF geophysical methods – a case study: Geophysics, 62, 80–86
| Mapping groundwater contamination using DC resistivity and VLF geophysical methods – a case study:Crossref | GoogleScholarGoogle Scholar |
Chen, Q. K., and Xi, Z. Z., 2005, Study of data processing procedure of EH4 electromagnetic imaging system: Non–ferrous: Mining and Metallurgy, 21, 7–9
| 1:CAS:528:DC%2BD28XntlOlsr4%3D&md5=d344aeb98b08d5d1a9d8419e6de0e8d8CAS |
Chen, Y. B., Zhang, S. T., and Hu, X. Q., 2000, The application of VLF–EM technique to a stibnite ore deposit in Tibet: Geophysical & Geochemical Exploration, 24, 383–386
| 1:STN:280:DC%2BD3c7is1Cguw%3D%3D&md5=a2766b0b49bad86c082e30dec0ced258CAS |
Deting, L., Jianming, L., and Liu, L., 2005a, The great evolvement in finding poly metal mine in southeast part of Da Xing’an Ling area: China Mining Magazine, 14, 6–10
Deting, L., Liu, L., and Huaiyu, Y., 2005b, The geological ore-froming feature and resource estimation of the silver polymetalic deposit in southeast part of Da Hingganling area: Contribution to Geology and Mineral Resources Research, 20, 269–275
Ferguson, I. J., Ristau, J. P., Maris, V. G., and Hosain, I., 1999, Geophysical imaging of a kaolinite deposit at Sylvan, Manitoba, Canada: Journal of Applied Geophysics, 41, 105–129
| Geophysical imaging of a kaolinite deposit at Sylvan, Manitoba, Canada:Crossref | GoogleScholarGoogle Scholar |
Fraser, D. C., 1969, Contouring of VLF–EM data: Geophysics, 34, 958–967
| Contouring of VLF–EM data:Crossref | GoogleScholarGoogle Scholar |
Geometrics, 2000, Operation Manual for Stratagem System Image. Version 2.16, 1–38.
Guangding, L., Guangzhi, T., and Dongsheng, L., 2003, The middle and southeast of the Da Xing’an Ling mountains–an important national colored metal resource reserve base: Bulletin of Chinese Academy of Sciences, 5, 324–325
Guerin, R., and Benderitter, Y., 1995, Shallow karst exploration using MT, VLF and DC resistivity methods: Geophysical Prospecting, 43, 635–653
| Shallow karst exploration using MT, VLF and DC resistivity methods:Crossref | GoogleScholarGoogle Scholar |
Guo, J. Q., Wu, Y., Shao, R. J., and Cao, F. X., 1998, A brief description of the stratagem EH4 electrical conductivity image–forming system and its application: Geophysical & Geochemical Exploration, 22, 458–464
Irvine, R. J., and Smith, M. J., 1990, Geophysical exploration for epithermal gold deposits: Journal of Geochemical Exploration, 36, 375–412
| Geophysical exploration for epithermal gold deposits:Crossref | GoogleScholarGoogle Scholar |
Karous, M., and Hjetl, S. E., 1983, Linear filtering of VLF dip-angle measurements: Geophysical Prospecting, 31, 782–794
| Linear filtering of VLF dip-angle measurements:Crossref | GoogleScholarGoogle Scholar |
Kunfa, S., 1999, Theory and application of controlled source audio frequency magnetotelluric method: Science Publishing House.
Liang, G. H., Xu, X. W., Xiao, Q. B., Cai, X. P., Qing, K. Z., Zhang, B. L., San, J. G., Hui, W. D., and Peng, X. M., 2007, Application of magnetotelluric method to Cu–Ni ore exploration: a case study of Tulargen Cu–Ni deposit in Xinjiang: Mineralium Deposita, 26, 120–127
| 1:CAS:528:DC%2BD2sXltFWmsLw%3D&md5=146f332c3dd8d0804a973cbab6bdabcdCAS |
Liu, H. T., Yang, X. Y., Yu, C. M., Ye, J., Liu, J. M., Zeng, Q. D., and Shi, K. F., 2004a, A case study in finding concealed ores by using geophysical exploration methods in combination of VLF–EM, EH4 and CSAMT: Progress in Geophsics, 19, 276–285
Liu, J. M., Zeng, Q. D., and Liu, L., 2004b, Hydrothermal Sediment Sandwich Skarn and Its Symbiosis Exhalative Deposit–Theory and Practice: Science Press.
Liu, H. T., Liu, J. M., Yu, C. M., Ye, J., and Zeng, Q. D., 2006, Integrated geological and geophysical exploration for concealed ores beneath cover in the Chaihulanzi goldfield, northern China: Geophysical Prospecting, 54, 605–621
| Integrated geological and geophysical exploration for concealed ores beneath cover in the Chaihulanzi goldfield, northern China:Crossref | GoogleScholarGoogle Scholar |
Mamoun, K. M., Soliman, F. A., Shendi, E. H., Khalil, S., and Nakagawa, K., 2004, Integrated geophysical exploration for sulphide minerals in the Wadi Sa’al area, south Sinai, Egypt: Journal of Geosciences, Osaka City University, 47, 113–126
Ni, F. M., and Liu, T. S., 1999, Principle and application of EH4 eletromagnetic system: Petroleum Instruments, 13, 32–34
Ogilvy, R. D., Cuadra, A., Jackson, P. D., and Monte, J. L., 1991, Detection of an air-filled drainage gallery by the VLF resistivity method: Geophysical Prospecting, 39, 845–859
| Detection of an air-filled drainage gallery by the VLF resistivity method:Crossref | GoogleScholarGoogle Scholar |
Okada, K., 1995, Geophysical exploration for epithermal gold deposits: case studies from the Hishikari gold mine: Exploration Geophysics, 26, 78–83
| Geophysical exploration for epithermal gold deposits: case studies from the Hishikari gold mine:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK2MXnsl2isrw%3D&md5=68fbff8b2ab6b02b66f26e928183029cCAS |
Pozdnyakova, L., Pozdnyakov, A., and Zhang, R., 2001, Application of geophysical methods to evaluate hydrology and soil properties in urban areas: Urban Water, 3, 205–216
| Application of geophysical methods to evaluate hydrology and soil properties in urban areas:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3MXntFSrtbo%3D&md5=b4991fbda6ca1452fdc793541faf490cCAS |
Qingdong, Z., Yuanchao, S., Tiebing, L., Guangming, L., Qirui, Z., Kunfa, S., Hongchen, L., Xiuying, S., and Jinzhoug, Y., 2004, Geophysical exploration for interlayer slip breccia gold deposit: example from Pengjiakuang gold deposit, Shandong Provine, China: Geophysical Prospecting, 52, 97–108
| Geophysical exploration for interlayer slip breccia gold deposit: example from Pengjiakuang gold deposit, Shandong Provine, China:Crossref | GoogleScholarGoogle Scholar |
Ramesh Babu, V., Subash, Ram, Srinivas, R., Veera Bhaskar, P., and Bhattacharya, A.K., 2004, VLF–EM surveys for uranium exploration in Dulapali area, Raigarh district, Madhya Pradesh, India: Journal of Geophysics, 5, 27–33
Sharma, S. P., and Baranwal, V. C., 2005, Delineation of groundwater bearing fracture zones in a hard rock area integrating very low frequency electromagnetic and resistivity data: Journal of Applied Geophysics, 57, 155–166
| Delineation of groundwater bearing fracture zones in a hard rock area integrating very low frequency electromagnetic and resistivity data:Crossref | GoogleScholarGoogle Scholar |
Shen, Y. C., Shen, P., Liu, T. B., Li, G. M., and Zeng, Q. D., 2008, Prediction of hidden gold ore-bodies in depleted mines by the Stratagem EH4 system: Progress in Geophysics, 23, 559–567
Takakura, S., 1995, CSAMT and MT investigation of an active gold depositing environment in the Osorezan geothermal area, Japan: Exploration Geophysics, 26, 172–178
| CSAMT and MT investigation of an active gold depositing environment in the Osorezan geothermal area, Japan:Crossref | GoogleScholarGoogle Scholar |
Wei, L.M., Sun, Z.J., and Zhou, X.Y., 2002, Posture and suggest of mineral resources for nonferrous metals: Mineral Deposits, 21, 71–74
Wu, L. P., Shi, K. F., Li, H. Y., and Li, S. J., 1996, Application of CSAMT to the search for groundwater: Acta Geophisica Sinica, 39, 712–717
Wu, Y., Liu, H. B., and Dong, X. K., 1998, Application of EH4 conductivity image system to sandstone type uranium deposits: Uranium Geology, 14, 32–37
Wu, Y., 1999, The application of EH4 electromagnetic image system to groundwater exploration in sandstone areas: Geophysical & Geochemical Exploration, 23, 335–346
Xu, Y., Zhang, S. T., and Gao, Y., 2008, Application of VLF–EM for revealing ore–controlling structures in Haerchulutu Ag–polymetallic deposit, Inner Mongolia: Geotectonica et Metallogenia, 32, 212–217
| 1:CAS:528:DC%2BD1cXotFSktbo%3D&md5=8df3dfa82b2b0c575605d4e7d656c26fCAS |
Yang, J. Z., Zhao, Y. L., Shen, Y. C., and Shi, K. F., 2000, Application research of CSAMT in the location forecasting of buried ore–bodies: Geological Science and Technology Information, 19, 107–112
| 1:CAS:528:DC%2BD3cXntlSqtL4%3D&md5=896a8a3ddee0b70d4335d0c22bc40845CAS |
Yu, C. M., 1998, The application of CSAMT method in looking for hidden gold mine: Acta Geophysica Sinica, 41, 133–138
Zhang, S. T., Xu, Z. Z., and Zheng, M. H., 1999, Application of VLF–EM to the location forecasting of ore: Geological Science and Technology Information, 18, 85–88
| 1:CAS:528:DyaK1MXitlOqtL8%3D&md5=cd4cd059ea20498001866718a9f63f4eCAS |
Zhang, R., Liu, L., and Xu, J. H., 2007, Application of VLF–EM method in mineral exploration of Longtoushan Ag–Pb–Zn deposit: Journal of Liaoning Technical University, 26, 4–7
| 1:CAS:528:DC%2BD2sXjvVyksb8%3D&md5=6bf92e70ea8b19173e8f905ed4da95ccCAS |
Zhang, R., Liu, L., Liu, J. M., and Lin, J. H., 2008, Application of comprehensive geophysical methods in the Longtoushan Ag–Pb–Zn deposit: Geology and Prospecting, 44, 67–72