Environmental Assessment
Volume B-3.5
Mine
Noise
Ambatovy Project
68
January 2006
3.5.4.5 Emissions
Sources of noise considered for the mine site assessment are summarized in
Table 3.5-2.
Table 3.5-2 Dynatec Mine Sound Emissions
Source
Type of Source
Sound Power
[dBA]
ore receiving - truck dumping
point
113.0
process water pumps
(d)
point
127.6
ore preparation thickner
point
120.6
ore receiving motor
point
103.7
truck traffic north
line
128.9
truck traffic south
line
127.2
conveyor
(a)
line
106.8
mine face pit
(b)
area
119.3
primary scrubber area
(c)
area
129.4
secondary scrubber area
(c)
area
128.4
engine generator set area
(c)
area
131.8
slurry pump house
(c)
area
106.3
Ambatovy waste stockpile
(d)
area
121.3
(a)
Sound Power for each system. There are six conveyor systems.
(b)
Sound Power for each face. The two mine faces are Ambatovy and Analamay. It was assumed
that the mine fleet was divided 50% to Ambatovy and 50% to Analamay.
(c)
Process equipment will have noise mitigation and controlled to 85 dBA.
(d)
Sound Power for each stockpile. There are two stockpiles.
The model presents a snapshot of the expected continuous noise levels generated
from the mine. To ensure that a “worst case” or highest expected noise level was
assessed, the model is based on mine operations in years 13/14 when the highest
number of vehicles and equipment will be in use. Mine face activity was
assumed to be at the top lift in the pit, where the pit wall does not effectively
shield noise. Other factors that were considered in the model are terrain,
meteorological conditions and ground conditions.
3.5.4.6 Results
Predicted noise levels at community receptors due to mining activity are
presented in Table 3.5-3.
