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Ground penetrating radar detection of underground unknown mining cavities in the open-pit at the Zijinshan Au-Cu deposit

DENG Shi-kun,MEI Bao,HU Chao-bin (Institute of Geophysics & Geomatrics,China University of Geosciences,Wuhan 430074,China)  
It is very significant for keeping safe mining in open pit and preventing sudden accident by accurately defining distributing area of ore field,roof depth and space heights through applying advanced geophysical technology to detect the underground unknown mining cavities in open pit.Using ground pentrating radar(GPR) to detect the underground unknown mining cavities in open pit in the Zijinshan Au-Cu deposit of Fujian Province,18 detecting profiles with their total length of 4km in two different detecting blocks have been finished.The processed GPR profiles with high clarity and resolution can reflect exactly the attributes,plane location,roof depths and approximate heights of the cavities.55 larger scale unknown cavities have been revealed by GPR.GPR system with 50MHz antennas can detect effectively the depth of more than 40m in this open pit.GPR would be little affected by landform condition and environment in open pit,and it can be used on rock surface directly without any absorbing attenuation of radar waves from Quaternary overburden.Inhence,GPR is very suitable for the detection and location of the under ground unknown mining cavities in open pit.
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