滇东北白龙潭磷矿床地质特征及资源潜力OA

The Baitanlong phosphate deposit,as an important part of the Sichuan-Yunnan phosphorite belt,exhibits significant characteristics such as thick ore layers,high grade,and shallow burial.Based on detailed exploration data of the mining area,this paper systematically summarizes regional geological characteristics,orebody distribution patterns,characteristics of primary ore and weathered ore,and evaluates resource potential in the deep and marginal areas.The results show that the natural ore types are mainly dense massive phosphate rock,dolomitic phosphate rock,siliceous phosphate rock and argillaceous phosphate rock.The industrial ore type is mainly siliceous-silicate type,belonging to a typical shallow marine sedimentary phosphate deposit.The weathered zone is limited in distribution,mainly concentrated in Ganlongbaobao and Baitanlong in the northern mining area.The shallow part of upper ore bed K4 is dominated by weathered and semi-weathered ore with P2O5 grade generally higher than 28％,while the deep primary ore grade remains stable at around 24％.The orebody thickness ranges from 6 to 8 m with a variation coefficient of 38.28％,and the grade varies from 16.39％to 34.34％with a variation coefficient of 15.92％.The lower ore bed K2 is mainly primary ore with a thickness of 0.75～5.87 m(average 2.65 m),tending to stabilize at about 4 m in the southern deep area with a thickness variation coefficient of 49.97％,and its grade ranges from 15.01％to 26.05％with a variation coefficient of 13.53％.Overall,both thickness and grade of K4 and K2 orebodies are stable in the southern deep mining area.Comprehensive analysis indicates that the southern part of the mining area has significant prospecting potential and prospects for a large-scale phosphate deposit.