Core Viewpoint - The construction of the West Yanshan Iron Mine, the largest single underground iron mine under construction in China, is progressing with significant challenges, particularly in the disassembly of the TBM "Foundation Stone" [1][2]. Group 1: Project Overview - The West Yanshan Iron Mine has a total investment of 22.9 billion yuan [2]. - The TBM "Foundation Stone" has completed 5,400 meters of auxiliary slope tunnel excavation and is set to be disassembled for transport back to the surface [1]. Group 2: Construction Challenges - Key challenges include the precision required for smooth blasting in a large and high workshop, where uneven rock walls pose risks to worker safety and project timelines [2]. - The technical team is conducting thorough explorations and precise calculations for drilling positions and depths, ensuring each drill hole is accurate to the centimeter [2]. Group 3: Future Plans - After the disassembly of the TBM, the workshop will be repurposed as a storage area for construction materials and equipment, maximizing the value of every investment [2]. - The TBM is expected to resume operations in the underground area around August or September of this year [2].