Comprehensive exploration techniques and Practices for Sandstone type uranium deposit:a case study of BYH uranium deposit in Erlian Basin
[Objective]Sandstone-type uranium deposits are the most important type of uranium deposits globally and the most economically recoverable type in China.The comprehensive application of various exploration techniques is an effective means of identifying the structure and composition of sandstone uranium deposits in the basin,the spatial distribution of uranium-bearing sands,and predicting the extension of uranium ore bodies.Sandstone-type uranium deposits in the Erlian Basin are generally characterised by shallow burial,paleovalley type mineralization with near-source and concentrated distribution in zones,and the establishment of comprehensive sandstone-type uranium mine detection technology methods in this type of basin according to local conditions is an important reference for prospecting and exploration.[Methods]Taking the BYH uranium deposit in the Chuanjing depression of the Erlian Basin as the research object,we extracted and geologically interpreted a variety of information such as gravity,aeromagnetism,electrical prospecting,seismicity,drilling,radon gas and gamma measurement,and established a combination of integrated detection technology.[Results]The combined model of"heavy magnetic search for rumbles,electric well seismic search for fractured sands,and radon and gamma circle anomalies"is proposed,aeromagnetic and gravity information will be used to explore the rumble and concave spreading patterns of concealed and semi-concealed rock bodies and basement,and to determine the favourable structures for regional mineralisation;then high-density electric resistance or audio geomagnetic sounding will be used to carry out the analysis of anomalous features of high resistance and low resistance uranium reservoirs.Then,high-density electrical resistance or audio geomagnetic analysis is used to analyse the characteristics of the anomaly,combined with 2D seismic profiles to finely delineate the structure of uranium reservoirs and fracture tectonic features,and to analyse the spatial distribution of ore-bearing sands;and radon gas and gamma total or spectral measurements are used to define the anomaly halo,analyse its spatial location in relation to the deep uranium ore bodies,and assess the extension of the uranium ore bodies.[Conclusions]Establishment of a comprehensive exploration technology combination for sandstone-type uranium deposits in the Erlian Basin,combined with the geological conditions of mineralization,is capable of guiding the exploration of regional sandstone-type uranium mines.
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