New advances in exploration and prospecting potential of phosphate deposits in the Yushan-zhongping area, central Guizhou

The Yushan-zhongping area is a large phosphorite concentration area recently discovered in central Guizhou. [Objective]This study addresses the critical shortage of high-quality phosphate exploration targets in Guizhou. [Methods]Based on recent exploration results from the Yushan-zhongping area, we analyze its transitional characteristics between the Kaiyang-xifeng and Wengan-fuquan ore clusters. Detailed investigations were conducted on the thickness and grade variation patterns of the "b" ore layer in the Yangshui formation, orebody burial depth, and potential mineral resources to comprehensively evaluate prospecting potential. [Results]Key findings indicate: (1) The area exhibits hybrid features of "Kaiyang-type" and "Wengfu-type" phosphate deposits, situated within their transitional metallogenic and lithofacies-paleogeographic zone; (2) Thickness and grade of the Yangshui formation "b" ore layer generally increase southward; (3) Orebody burial elevations may rise or stabilize toward the southern Weng'an-fuquan cluster, with four predictive burial models established; (4) Preliminary estimates reveal >3 billion tonnes of phosphate resources in the underexplored southern transitional zone. [Conclusion]The southern sector demonstrates significant prospecting potential and constitutes a strategic reserve for future high-quality exploration targets in Guizhou.