摘要 : Background: Noise mapping is a very promising tool for noise management which is now mandatory in Indian mines as per guidelines of the Directorate General of Mines Safety (DGMS). As a pilot study, noise mapping was conducted in a... 展开 Background: Noise mapping is a very promising tool for noise management which is now mandatory in Indian mines as per guidelines of the Directorate General of Mines Safety (DGMS). As a pilot study, noise mapping was conducted in an opencast mine with three different models; one based on the baseline operating conditionsin two shifts (Situation A), and two other virtual situations where either production targets were enhanced by extending working hours to three shifts (Situation B) or only by increased mechanisation and not changing the duration of work (Situation C).Methods: Noise sources were categorized as point, line, area and moving sources. Considering measured power of the sources, specific meteorological and geographical parameters, noise maps were generated using Predictor LimA software.Results: In all three situations Lden values were 95dB(A) and 70-80 dB(A) near Drill Machine and haul roads respectively. Noise contours were wider in Situation C due to increase in frequency of dumpers. L_(den) values near Shovel 1 & 2 under Situation B increased by 5 dB and 3dB respectively due to expansion of working hours.In Situation C noise levels were >82 dB(A) around shovels. Noise levels on both sides of conveyor belts were in the range of 80-85 dB(A) in Situation A & C while it was 85-90 dB(A) in Situation B. Near crusher plants it ranged from 80-90 dB(A) in Situation A and C and between 85 and 95 dB(A) in Situation B. In all situations noise levels near residential areas exceeded the CPCB limits i.e. 55 dB(A).Conclusions: For all situations, predicted noise levels exceeded CPCB limits within the mine and nearby residential area. Residential areas near the crusher plants are vulnerable to increased noise propagation. It is recommended to put an acoustic barrier near the crusher plant to attenuate the noise propagation. 收起