Kumtor Gold Company currently owns 5 ultra large mining hydraulic excavators EX3600-6 produced by Hitachi Construction Machinery. The device that broke the record of 100000 hours of cumulative running time this time was one of the ones delivered for use in 2012. The Kumtor gold mine is located in a plateau area with an altitude of over 4000 meters, and winter temperatures can even drop as low as minus 40 degrees Celsius, making it an extremely harsh natural environment. Under these conditions, achieving 100000 hours of stable operation fully demonstrates the high rigidity, durability, and reliability of Hitachi's construction machinery products, and also proves its outstanding advantages in parts quality and after-sales service system. The second hand excavator EX1200-7 is equipped with an imported Cummins engine with a rated power of up to 567kW, providing a powerful and stable output for continuous heavy-duty operations. Paired with it is Hitachi Construction Machinery's unique HIOS IIIB artificial intelligence hydraulic system, which can intelligently sense load changes, accurately coordinate hydraulic pumps and engines, achieve optimal matching of power efficiency, and significantly reduce fuel consumption while outputting strong productivity. In addition, the electric regulator equipped on the hydraulic pump can further optimize control accuracy and improve operational efficiency.