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Journal of Applied Mathematics and Statistical Applications | Volume: 1
August 23-24, 2018 | London, UK
Applied Physics
3
rd
International Conference on
Integrating gravity and magnetic field data to delineate structurally controlled gold mineralization in
the Sefwi Belt of Ghana
Bernard Konadu Amoah
Southwest University of Science and Technology, China
G
ravity and magnetic surveys were used to delineate
potential gold mineralization zones in the Sefwi belt
of Ghana. The study area is an intrusive dominated area
that hosts pockets of smallscale mining operations locally
referred to as Galamsey. These Galamsey operations are
not guided by a scientific approach to back the trend of
gold mineralization which is conventionally mined. The
study aimed at mapping lithological units, structural
setting and relating Galamsey sites to delineate potential
zones of gold mineralization. A Scintrex CG5 gravimeter
and GEM’s Overhauser magnetometer were used for
gravity and magnetic data acquisition respectively. The
magnetic data were corrected and enhancing filters such
as reduction to the pole (RTP), analytical signal and first
vertical derivative were applied using Oasis montaj 7.1.
Gravity data were also reduced to the geoid using the Oasis
montaj software to produce a complete Bouguer anomaly
map. The regional/residual separation technique produced
a residual gravity map. The RTP and analytical signal filters
from the magnetic data and residual gravity anomaly map
from the gravity data helped in mapping belt type (Dixcove)
Birimian granitoids and mafic intrusive unit, interpreted
as gabbro. The first vertical derivative filter was useful in
mapping NE/SW minor faults and crosscutting dykes largely
concentrated in the belt type Birimian granitoids. All the
three mapped Galamsey sites fell on a minor fault and are
associated with the belt type granitoids which were used
in delineating four potential zones of gold mineralization.
e:
bernardowuraku@yahoo.com