Applications of lithological ore-controlling factors in mineral prospecting of No.4 ore zone in Zoujiashan uranium deposit

The occurrence of No.4 ore zone in Zoujiashan uranium deposit is complex, which includes NE, EW, SN and NW trend, ore-controlling factors mainly include lithology and structure. For figuring out regularities of lithological ore-controlling factors of the No.4 ore zone, laying out prospecting works reasonably, improving efficiency of prospecting, ore bodies around contacting belt of No.4 ore zone are exploited, described and analyzed. Research shows the rocks contact interface of No.4 ore zone has great morphological changes, resulting in changes in the vicinity of ore occurrence, when the the rocks contacted interface is gradual, the uranium ore-bodies of NE, NW and EW trend are easy to form; when the the rocks contact interface is steep, the uranium ore-bodies of NW and NE trend are easy to form; when the the rocks contact interface presents a gentle curve, the uranium ore-bodies of EW, NE and SN trend are easily formed. (authors)