Magnetic susceptibility and density characterization of mineralized and non mineralized rocks in the Chirano Gold Camp, Ghana
Loading...
Date
2013-09-03
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Magnetic susceptibility measurements taken on drilled cores from two holes indicate that
the core from Paboase deposit had a magnetic susceptibility value within the range of
(3.96 – 7.49) x 10
-6
SI and a mean of 5.90 x 10
-6
SI for the non mineralized rocks and
magnetic susceptibility within the range (2.29 - 4.58) x 10
-6
SI for the mineralized rocks
with a mean value of 3.51.90 x 10
-6
SI. The drilled core from the Akwaaba deposit had a
magnetic susceptibility in the range of (5.02 - 12.36) x 10
-6
SI with a mean of 7.37 x 10
-6
SI for the non mineralized rocks and (1.0 – 7.0) x 10
-6
SI with a mean of 4.99 x 10
-6
SI for
mineralized rocks. Comparatively, the magnetic susceptibility of the non mineralized
rocks from the Paboase concession are high with low assay values within the range of
(0.01 – 0.17) ppm while the mineralized rocks have low magnetic susceptibility with high
assay values within the range of (1.25 – 17.4) ppm. The assay result for the Akwaaba
deposit follows the same trend as that of Paboase deposit, low from (0.00 – 0.04) ppm
within the non mineralized rocks but high assay values of (0.41 – 10.13) ppm within the
mineralized rocks.
There was a general negative correlation between the assay values and the magnetic
susceptibility values. The magnetic susceptibility values decrease drastically for rocks
with high gold assay values while those with very low gold assay values generally have
high magnetic susceptibility values.
Selected rocks from the two holes on which density measurements were carried also
produced densities around the means of 2698.56 kg/m
3
for basalt and 2704.11kg/m
3
for
tonalite from Paboase deposit, 2959.57kg/m
3
for basalt from Akwaaba deposit
These correlations are strong signals that can be used to delineate mineralized zones in
the area with a prove backed by the use of other geophysical method.
Description
A thesis submitted to the School of Graduate Studies,
Kwame Nkrumah University of Science and Technology, Kumasi, Ghana,
in partial fulfillment of the requirements for Master of Science, 2013