Abstract: Relying on 3 390~3 220 m high-elevation ramp project in Huanglonggou Mine， and on the basis of the original construction ventilation design， the CO concentration standard is raised from 15 mg/m3 to 30 mg/m3 by referencing to the CO concentration limits from other countries. Based on the weather data near the Huanglonggou Mine， the air density ratio Kh with high elevation is fitted to calculate the air volume needed by the construction ventilation after the elevation corrected. The original scheme adopted the forced ventilation with 2 working areas. From views of energy saving and project implementation， the construction ventilation scheme was optimized to be the gallery ventilation with 3 working areas， and the foul air could be exhausted from the ore chute. After optimization， the maximum air duct length was reduced from 2 916 m to 1 330 m. The rationality of this ventilation scheme was verified by calculating the wind flow distribution of laneway through ventilation network. The field test results showed that it only needs about 20 minutes when the CO concentration is lowered to the concentration limit. This ventilation scheme can perfectly meet the technical requirement of the construction ventilation.

Key words: High elevation, CO concentration, Mine, Construction ventilation, Field test