The Third Ball Mill Project is located in Bombas Mining Area, Cuscoras, Peru with an altitude of 4,000 meters to 4,500 meters. The size of the Third Ball Mill is 26ft× 40.5ft (7.9248m× 12.3444m). The Third Ball Mill project includes a small amount of civil construction, Ball Mill body installation, hydraulic lubrication system installation, electrical and instrumentation, etc. Under the influence of unfavorable factors such as plateau construction, limited operation surface, difficulty in prevention and control of overseas epidemic situation, the project management team carefully organized the construction and reasonably arranged the schedule. With the efforts of many parties, the Third Ball Mill successfully completed the first test-drive with water, and passed the project acceptance at one time with outstanding performance of the whole machine, which was also well received and affirmed by the owner, supervisor, designer and other parties. The successful trial run greatly shortened the construction period of the Third Ball Mill project, which marked that the Third Ball Mill project had entered the stage of delivery and completion.