Core Viewpoint - The company has implemented comprehensive measures to address high-temperature issues in underground mining operations, focusing on system optimization, mechanical cooling, and individual protection to create a safer working environment for employees [1][5][6]. Group 1: System Optimization - The company has optimized the ventilation system by replacing high-power fans and increasing airflow in working areas, raising the airflow in the North Second Return Lane from 10,000 cubic meters per second to approximately 12,000 cubic meters per second [1]. - In April, the company upgraded the drive system of a belt conveyor, replacing the existing system with a permanent magnet variable frequency direct drive motor, resulting in a temperature reduction of about 5 to 6 degrees Celsius in the tunnel [1][3]. Group 2: Mechanical Cooling - The company installed four 30-kilowatt carbon dioxide cross-critical cooling units at the Central District's auxiliary shaft, which blow 10-degree Celsius cool air directly into the shaft, effectively improving the high-temperature environment in underground areas [2]. - The existing cooling system, which was put into operation in 2012, has been enhanced through various upgrades, including power supply systems and water treatment systems, significantly improving operational safety and cooling efficiency [3]. Group 3: Individual Protection - The company has established a rotation system for high-temperature work points, increased rest times for employees, and set up rest chambers in high-temperature areas [5]. - Employees have been provided with cooling vests and other protective equipment, and the company has set up water supply stations to ensure continuous access to drinking water [5][6].