First discovery of No.Ⅳ antimony ore body in the northern mine of a tin mine,Hunan Province
From 2021 to 2022,a major breakthrough has been made in the exploration of successive resources of the northern mine in the antimony deposit of a tin mine,Hunan Province.For the first time,the antimony body No.Ⅳ was discovered in the Laokuangshan and the Tongjiayuan deposits of the northern mine,both of which are antimony ore bodies in the interlayer fracture zone.There are two layers of No.Ⅳ antimony ore body in borehole ZK3001 of the Laokuangshan deposit.The average grade and true thickness of the first layer of No.Ⅳ antimony ore body are 4.23％and 3.30 m,while those of the second are 1.30％and 2.00 m.There is one layer of No.Ⅳ antimony ore body in borehole KZK01401 of the Tongjiayuan deposit,whose grade and true thickness are 3.96％and 1.03 m,re-spectively.No.Ⅳ antimony ore body is controlled by faults and strata,and occurred in the silicified limestone of the Qiziqiao Formation and interlayer fracture zones in the foot wall of NE-trending faults F72 and F3.Individual ore body is formed in lenticular,lateral pinnate or lentil shapes with pinching-out recurrence.The fault footwall ore body strikes NE-SW and dips NW at about 60°,while the ore body in the interlayer fracture zone strikes NE-SW and dips SE at about 20°.Sandstone and shale section of Longkouchong,and thin shale of Qiziqiao Formation are favorable barriers for enrichment of No.Ⅳ orebody,with ore-controlling characteristics of fault structure,fa-vorable lithology and shield layer.The first discovery of No.Ⅳ antimony ore body in the northern mine of the tin mine can be directly developed,which can not only extend the service life of the mine,but also have great significance for the study of the relationship be-tween the deep structure of the tin mine and the ore body.The Qiziqiao Formation is seen as the second metallogenic space of the tin mine,which makes clear the direction for further resource exploration and prospecting in this area,and is expected to expand the pros-pect of the northern mine(antimony ore)of the tin mine.
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