annexc - Newmont Mining Corporation

Annex C6 -- Noise Supplemental Information C6 - 4
The measured sound levels differ somewhat between the May and October surveys. During
the May survey, L90S ranged from approximately 38 to 55 dBA during both day and night.
During the October survey, the L90S ranged from 35 to 66 dBA during the day and 41 to
62 dBA at night. During the daytime, the highest levels during the October survey were
approximately 10 dBA louder than the May survey, while at night the levels were similar.
Again, the reasons for these differences are not completely understood.
Afosu (M4) - Measurements were conducted in front of the Methodist Church in Afosu.
This location is representative of the closest residents in Afosu to the proposed mine. The
church is located on the main street in Afosu but about 200 meters away from the main
north-south road.
The measured sound levels differ greatly between the May and October surveys. During
the May survey, L90S ranged from approximately 42 to 55 dBA during the day and 30 to 49
dBA at night. During the October survey, the L90S ranged from approximately 40 to 78
dBA during the day and 41 to 71 dBA at night. The levels during the October survey were
relatively loud, and crickets are suspected as the primary noise source.
Adausena (M5) - Measurements were conducted near the top of the hill in Adausena,
where there is a direct line of sight to the proposed pit. This location is representative of
the residences in the village closest to the proposed mine.
The measured sound levels differ somewhat between the May and October surveys. During
the May survey, L90S ranged from approximately 35 to 66 during the day and 38 to 57 dBA
at night. During the October survey, the L90S ranged from approximately 36 to 75 dBA
during the day and 48 to 63 dBA at night. During the daytime, the loudest levels during the
October survey were approximately 10 dBA louder than the loudest May levels. During the
night time, the quietest levels in the October survey were approximately 10 dBA louder
than the quietest May levels. Again, the reasons for this are not completely understood, but
crickets are suspected.
Hweakwae (M6) - Measurements were conducted in front of the Catholic Church in
Hweakwae. This location is representative of Hweakwae residences located closest to the
proposed mine.
In Hweakwae, the measured sound levels are similar between the May and October surveys.
During the May survey, the L90S ranged from approximately 38 to 65 dBA during the day
and 38 to 57 dBA at night. During the October survey, the daytime L90S ranged from 40 to
69 dBA while the night time levels ranged from 44 to 60 dBA.
Akyem Gold Mining EIS November 2008 FINAL EIS