Group 1 - The core viewpoint of the article highlights that YunTu Holdings (002539.SZ) is actively developing multiple mining projects, including a 2.9 million ton mining project at the Aju Luo Xia Phosphate Mine [1] - The infrastructure process at the Aju Luo Xia Phosphate Mine produces ore that is primarily used for yellow phosphorus production, while the fine ore generated during phosphate ore processing is sold externally due to its inability to meet yellow phosphorus production requirements [1] - The company is also advancing a 4 million ton mining project at the Niu Niu Zhai East Section Phosphate Mine, while the Niu Niu Zhai West Section is in the "exploration to production" phase [1] Group 2 - The Er Ba Phosphate-Lead-Zinc Mine is currently undergoing efforts to resume production [1]