General project: Sales of mechanical parts and components; Sales of mining machinery Research and development of mechanical equipment Technical services, technical development, technical consultation, technical exchange, technical transfer, and technical promotion; Information system operation and maintenance services Research and development of efficient and energy-saving technologies in the mining industry Import and export of goods Lubricating oil sales Sales of mechanical and electrical equipment Leasing of mechanical equipment Leasing services (excluding licensed leasing services); Sales of hydraulic power machinery and components Sales of metal tools Sales of mechanical equipment Sales of building materials Retail of hardware products General equipment repair Specialized equipment repair Processing of mechanical parts and components General equipment manufacturing (excluding special equipment manufacturing) Mining machinery manufacturing (except for projects that require approval by law, business activities are carried out independently in accordance with the business license in accordance with the law)