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1.0 INTRODUCTION
AngloGold Ashanti (Iduapriem) Limited engaged Geo-Systems Consulting Limited, aHydrogeological and Geo-environmental Engineers to provide hydrogeological services
leading to the construction of monitoring wells at the Greenfields Tailing Storage Facility.
The scope of work involves the finding of potential site (geological anomaly) for the
construction of the monitoring wells and also to identify places of higher resistivity where
groundwater flow is unlikely. The Geophysical investigations have since been carried out andthis report is on the results obtained.
Geo-Systems carried out the Hydrogeological studies (Siting) to ensure a smooth and
successful implementation of the project and also to achieve a high success rate for the
drilling works by applying the most scientific and appropriate approach to the site selection
activity. The ensuing pages elaborate on the studies carried out.
2.0 GEOPHYSICAL SETTING
A brief description of the physical setting of the project areas are presented in terms of
geological and hydrogeological conditions, topography, climate, vegetation, and drainage.
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Attitude measurement on indistinct relict bedding observed in the weathering representative
of the Banket Series Quartzite at the north western sector of the proposed site show dips of35
0to the north east.
Figure 2 1: Geological Map of Proposed TSF Site (Modified after SRK 1997)
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3.1 Initial studies
At the inception of the hydrogeological studies, a quick assessment of the terrain was carriedout. Information on the previous drilling activities in the areas was looked at, and other
relevant hydrogeological information was accessed.
3.2 Reconnaissance & Field Work
3.2.1 Field Reconnaissance and Terrain Evaluation
A Field reconnaissance survey was carried out in the project area to verify, confirm and
update results of the preliminary information at hand. The essential information gathered
in the area included; location of existing water supplies sources (boreholes, hand dug
wells, streams) if any, location of dry holes from previous drilling activities.
3.2.2 Geophysical profile measurements
Geophysical profile measurements were carried out at a station interval of 10 meters
along each traverse. The strategy for geophysical profiling was targeted at medium to
deeper zones. The main geophysical profiling method applied was the electrical resistivity
profiling using the Schlumberger array. On-site processing and interpretation of
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to delineate fractures and aquifer zones, and depth of drilling. Two sites were selected for
each borehole and prioritized as prime and alternate sites (ie.1st Choice and 2nd Choice).Accessibility of site for drilling machinery was also considered in the selection and
prioritization of sites.
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4.0 REPORTING
In the following section details of work carried out by Geo-Systems in the GreenfieldsTailing Storage Facility, covering background information collection, field reconnaissance
surveys, geophysical investigations, geophysical investigation results, geophysical data
analyses and interpretation with tables, graphs, etc. have been presented. Recommendations
on drilling sites and depths of drilling have also been outlined.
4.0 LINE 3A1-3A2
4.1 BackgroundThe line 3A1-3A2 is 300m in length and is located at southernmost part of the Greenfields
Tailing Storage Facility. The area is covered and underlain by Kawere Conglomerate.
4.2 Geophysical Investigation
4.2.1 Horizontal Profiling
The horizontal profiling was run along the line 3A1-3A2 with a total length of 300m as
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Table 4.2: VES results and their interpretation
Site No.
App. Resistivity
Range (Ohm-m)
Expected Aquifer
zone (m)
Average
weathering
depth (m)
Remarks
VES1 4021338 1050 20 Water may occur in
the weathered
zone.
VES2 2691625 1040 15 Water may occur in
the weathered
zone.
4.2.3 Recommendations
The investigated sites have been ranked as shown in Table 4.3. The recommended
maximum drilling depths for the various sites may not be exceeded. The decision to stop
drilling or to continue will be taken by the supervisor on site.
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SCHLUMBERGER HORIZONTAL PROFILING RESULTS
LOCATION : GTSF DATE : 16-03-2011
LINE :3A1-3A2
20 30 40 50 60 70 80 90 100 110 120 130 140
20 1291 2788 2031 2160 1899 1652 1909 1905 2174 1254 1464 922 1057
40 1862 1797 1630 2561 2343 1942 1937 1631 1983 2368 1950 1637 1520
150 160 170 180 190 200 210 220 230 240 250 260
20 1265 1613 906 610 473 435 649 701 468 614 476 493
40 1592 1809 1316 1112 940 1057 1368 1052 900 957 1061 1125
Figure 4.1: Horizontal profiling results and curves for Line3A1-3A2
50 100 150 200 250
100
1000
10000
100000
VES2
App.R
es(ohms-m
)
AB/2 (m)
20m
40m
LINE:3A1-3A2
VES1
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Project : GTSF Community : Tarkwa
Client : AGA IDUPRIEM District :
Survey No.:VES2 Date :16-03-2011
AB/2(m) MN/2(m) P(V) C(I) R(ohm)
Mult
factor App Res
(ohm)
1 0.2 7.54
1.5 0.2 17.36
2 0.2 31.11
3 0.2 70.40
5 0.2 25.03 18.24 1.372 196.11 269.120
7 0.5 33.41 15.09 2.214 153.21 339.224
10 0.5 25.42 19.11 1.330 313.50 417.016
15 0.5 7.71 9.62 0.801 706.36 566.114
20 0.5 8.02 14.36 0.558 1256.36 701.670
25 5.0 27.10 6.24 4.343 188.57 818.956
30 5.0 30.69 10.21 3.006 275.00 826.616
35 5.0 42.97 18.36 2.340 377.14 882.670
40 5.0 21.90 11.11 1.971 495.00 975.743
50 5.0 11.81 7.56 1.562 777.86 1215.145
58 5.0 15.56 12.45 1.250 1049.40 1311.539
70 5.0 16.80 16.47 1.020 1532.14 1562.842
80 10.0 9.94 6.06 1.640 990.00 1623.861
90 10.0 1257.14
100 10.0 1555.71
AB = distance between outer electrodes
MN=distance between inner electrodes Figure 4.2b: Vertical electric sounding curves for line3A1-3A2
P(V)= Potential R(ohm)= Resistance C(I)= Current
1 10 100
10
100
1000
10000
App.R
es.(
ohms-m
)
AB/2(m)
Schlumberger VES at Line 3A1 to 3A2 -VES2
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5.0 LINE 3B1-3B2
5.1 Background
The line 3B1-3B2 is 400m in length and is located at the southern part of the Greenfields
Tailing Storage Facility. The area is covered and underlain by Kawere Conglomerate.
5.2 Geophysical Investigation
5.2.1 Horizontal Profiling
The horizontal profiling was run along the line 3B1-3B2 with a total length of 400m as
detailed in Table 5.1. Plots of apparent resistivity versus chainage (m) along the traverse
lines are presented in Figure 5.1. The anomalous points were picked based on both direct
observation and results of the resistivity readings.
Table 5.1: Results and interpretation of Horizontal Profiling
Line Bearing
(o
)
Length
( )
Anomalies Remarks
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Table 5.2: VES results and their interpretation
Site No.
App. Resistivity
Range (Ohm-m)
Expected Aquifer
zone (m)
Average
weathering
depth (m)
Remarks
VES3 377792 1060 25 Water may occur in
the weathered
zone.VES4 391689 10 - 70 25 Water may occur in
the weathered zone
VES5 656 - 1146 10 - 50 20 Water may occur in
the weathered zone
VES6 667
1286 10 - 40 20 Water may occur inthe weathered zone
VES7 608 - 1613 10 - 30 15 Water may occur in
the weathered zone
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SCHLUMBERGER HORIZONTAL PROFILING
RESULTS
LOCATION :GTSF DATE : 17-03-2011
LINE :3B1-3B2
20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
20 676 377 457 598 982 626 1653 1984 1258 417 946 1135 489 405 549
40 647 532 717 1294 1980 1050 1352 1206 1103 1156 734 987 568 369 555
220 230 240 250 260 270 280 290 300 310 320 330 340 350 360
20 710 702 759 1081 1198 1911 1361 1674 2021 706 1365 1617 1670 865 2521
40 737 1201 959 1012 1171 1569 1578 1639 1655 1432 2263 2113 1866 1526 2572
Figure 5.1: Horizontal profiling results and curves for Line3B1-3B2
20 40 60 80 100 120 140 160 180
100
1000
10000
VES4
App.Res(ohms-m)
Chainage (m)
20m40m
LINE:3B1-3B2
VES3
220 240 260 280 300 320 340 360
100
1000
10000
100000
VES7VES6
App.Res(ohms-m)
Chainage (m)
20m40m
LINE:3B1-3B2
VES5
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Project : GTSF Community : Tarkwa
Client : AGA IDUPRIEM District :
Survey No.:VES3 Date :17-03-2011
AB/2(m) MN/2(m) P(V) C(I) R(ohm) Mult factor App Res
(ohm)
1 0.2 7.54
1.5 0.2 17.36
2 0.2 31.11
3 0.2 70.40
5 0.2 19.73 6.56 3.007 196.11 589.756
7 0.5 28.52 8.54 3.340 153.21 511.756
10 0.5 6.59 4.32 1.526 313.50 478.546
15 0.5 2.01 3.54 0.567 706.36 400.645
20 0.5 1.24 4.13 0.301 1256.36 377.546
25 5.0 15.89 6.56 2.422 188.57 456.756
30 5.0 9.69 5.45 1.779 275.00 489.089
35 5.0 9.02 6.65 1.357 377.14 511.634
40 5.0 5.60 5.21 1.075 495.00 532.132
50 5.0 3.64 4.87 0.747 777.86 581.312
58 5.0 3.59 6.12 0.587 1049.40 616.423
70 5.0 3.33 7.43 0.448 1532.14 686.756
80 10.0 2.70 3.76 0.717 990.00 709.809
90 10.0 4.36 7.650 0.570 1257.14 716.534100 10.0 2.42 4.76 0.509 1555.71 792.423
AB = distance between outer electrodes
MN=distance between inner electrodes Figure 5.2a: Vertical electric sounding curves for line3B1-3B2
P(V) = Potential R (ohm) = Resistance C(I) = Current
1 10 100
10
100
1000
10000
App.Res.(ohms-m
)
AB/2(m)
Schlumberger VES at Line 3B1 to 3B2 -VES3
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Project : GTSF Community : Tarkwa
Client : AGA IDUPRIEM District :
Survey No.:VES4 Date :17-03-2011
AB/2(m) MN/2(m) P(V) C(I) R(ohm)
Mult
factor App Res
(ohm)
1 0.2 7.54
1.5 0.2 17.36
2 0.2 31.11
3 0.2 70.40
5 0.2 26.24 7.32 3.585 196.11 702.980
7 0.5 21.08 4.77 4.422 153.21 677.508
10 0.5 12.42 6.13 2.025 313.50 634.870
15 0.5 1.56 2.07 0.754 706.36 532.756
20 0.5 2.56 6.89 0.372 1256.36 467.453
25 5.0 23.68 9.13 2.594 188.57 489.131
30 5.0 6.88 3.66 1.882 275.00 517.423
35 5.0 6.00 4.76 1.261 377.14 475.645
40 5.0 8.01 9.65 0.830 495.00 410.798
50 5.0 3.44 6.85 0.503 777.86 391.423
58 5.0 2.02 5.07 0.398 1049.40 417.645
70 5.0 1.30 4.13 0.314 1532.14 481.534
80 10.0 1.19 2.22 0.537 990.00 531.76890 10.0 3.59 7.31 0.491 1257.14 616.813
100 10.0 2.35 5.31 0.443 1555.71 689.067
AB = distance between outer electrodes
MN=distance between inner electrodes Figure 5.2b: Vertical electric sounding curves for line3B1-3B2
P(V) = Potential R (ohm) = Resistance C(I) = Current
1 10 100
10
100
1000
10000
App.Res.(ohms-m)
AB/2(m )
Schlumberger VES at Line 3B1 to 3B2 -VES4
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Project : GTSF Community : Tarkwa
Client : AGA IDUPRIEM District :
Survey No.:VES5 Date :17-03-2011
AB/2(m) MN/2(m) P(V) C(I) R(ohm) Mult factor App Res
(ohm)
1 0.2 7.54
1.5 0.2 17.36
2 0.2 31.11
3 0.2 70.40
5 0.2 18.91 5.65 3.347 196.11 656.481
7 0.5 31.38 6.45 4.865 153.21 745.323
10 0.5 19.37 7.68 2.523 313.50 791.112
15 0.5 4.43 4.08 1.086 706.36 767.418
20 0.5 1.94 3.43 0.566 1256.36 710.659
25 5.0 22.85 6.09 3.753 188.57 707.619
30 5.0 24.75 9.67 2.559 275.00 703.756
35 5.0 3.93 2.12 1.853 377.14 698.760
40 5.0 2.49 1.67 1.489 495.00 737.089
50 5.0 3.88 3.78 1.027 777.86 798.512
58 5.0 5.76 7.42 0.775 1049.40 813.660
70 5.0 2.50 4.21 0.593 1532.14 908.734
80 10.0 2.98 3.07 0.973 990.00 963.53190 10.0 6.08 7.560 0.805 1257.14 1011.834
100 10.0 2.85 3.86 0.737 1555.71 1146.712
AB = distance between outer electrodes
MN=distance between inner electrodes Figure 5.2c: Vertical electric sounding curves for line3B1-3B2
P(V) = Potential R (ohm) = Resistance C(I) = Current
1 10 100
10
100
1000
10000
App.Res.(o
hms-m
)
AB/2(m)
Schlumberger VES at Line 3B1 to 3B2 -VES5
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Project : GTSF Community : Tarkwa
Client : AGA IDUPRIEM District :
Survey No.:VES6 Date :17-03-2011
AB/2(m) MN/2(m) P(V) C(I) R(ohm) Mult factor App Res
(ohm)
1 0.2 7.54
1.5 0.2 17.36
2 0.2 31.11
3 0.2 70.40
5 0.2 10.45 3.07 3.403 196.11 667.320
7 0.5 22.05 4.53 4.867 153.21 745.630
10 0.5 12.48 4.87 2.563 313.50 803.408
15 0.5 3.58 3.23 1.107 706.36 781.787
20 0.5 3.28 5.43 0.604 1256.36 759.313
25 5.0 37.74 9.05 4.171 188.57 786.445
30 5.0 13.57 4.56 2.976 275.00 818.534
35 5.0 6.41 2.76 2.324 377.14 876.545
40 5.0 4.28 2.21 1.939 495.00 959.634
50 5.0 8.71 6.87 1.269 777.86 986.734
58 5.0 8.12 8.43 0.964 1049.40 1011.131
70 5.0 8.10 11.42 0.709 1532.14 1086.423
80 10.0 8.91 7.68 1.160 990.00 1148.645
90 10.0 10.33 10.67 0.968 1257.14 1216.534100 10.0 7.55 9.13 0.827 1555.71 1286.834
AB = distance between outer electrodes
MN=distance between inner electrodes Figure 5.2d: Vertical electric sounding curves for line3B1-3B2
P(V) = Potential R (ohm) = Resistance C(I) = Current
1 10 100
10
100
1000
10000
App.Res.(ohms-m
)
AB/2(m)
Schlumberger VES at Line 3B1 to 3B2 -VES6
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Project : GTSF Community : Tarkwa
Client : AGA IDUPRIEM District :
Survey No.:VES7 Date :17-03-2011
AB/2(m) MN/2(m) P(V) C(I) R(ohm)
Mult
factor App Res
(ohm)
1 0.2 7.54
1.5 0.2 17.36
2 0.2 31.11
3 0.2 70.40
5 0.2 9.57 2.65 3.612 196.11 708.340
7 0.5 20.05 4.76 4.212 153.21 645.320
10 0.5 13.54 6.98 1.940 313.50 608.121
15 0.5 4.30 4.56 0.942 706.36 665.32520 0.5 1.99 3.53 0.562 1256.36 706.534
25 5.0 35.28 7.89 4.471 188.57 843.132
30 5.0 31.43 9.43 3.333 275.00 916.560
35 5.0 42.92 14.00 3.066 377.14 1156.312
40 5.0 33.08 11.43 2.894 495.00 1432.657
50 5.0 16.89 8.68 1.946 777.86 1513.534
58 5.0 20.19 13.56 1.489 1049.40 1562.423
70 5.0 8.90 9.65 0.922 1532.14 1412.834
80 10.0 10.76 7.54 1.427 990.00 1412.52390 10.0 10.57 8.68 1.218 1257.14 1531.113
100 10.0 5.77 5.56 1.037 1555.71 1613.45
AB = distance between outer electrodes
MN=distance between inner electrodes Figure 5.2e: Vertical electric sounding curves for line3B1-3B2
P(V) = Potential R (ohm) = Resistance C(I) = Current
1 10 100
10
100
1000
10000
App.Res
.(ohms-m
)
AB/2(m)
Schlumberger VES at Line 3B1 to 3B2 -VES7
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6.0 LINE 3A1-2A1
6.1 Background
The line 3A1-2A1 is 400m in length and is located at the southeastern part of the Greenfields
Tailing Storage Facility. The area is covered and underlain by Kawere Conglomerate.
6.2 Geophysical Investigation
6.2.1 Horizontal Profiling
The horizontal profiling was run along the line 3A1-2A1 with a total length of 400m. The
line3A1-2A1 was subdivided in to line1 and line2, each of length 200m, as detailed in
Table 6.1. The subdivision was due to the presence of a stream at the midsection of the
line3A1-2A1 which hinders a continuous profiling. Plots of apparent resistivity versus
chainage (m) along the traverse lines are presented in Figure 6.1. The anomalous points
were picked based on both direct observation and results of the resistivity readings.
T bl 6 1 R l d i i f H i l P fili
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Table 6.2: VES results and their interpretation
Site No.App. ResistivityRange (Ohm-m)
Expected Aquiferzone (m)
Averageweathering
depth (m)
Remarks
VES8 498846 1060 20 Water may occur in
the weathered
zone.VES9 371606 10 - 70 25 Water may occur in
the weathered zone
VES10 386509 10 - 70 25 Water may occur in
the weathered zone
VES11 434
713 10 - 60 20 Water may occur inthe weathered zone
6.2.3 Recommendations
Th i i d i h b k d h i T bl 6 3 Th d d
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SCHLUMBERGER HORIZONTAL PROFILING
RESULTS
LOCATION :3A1-
2A1
DATE : 17-03-
2011
LINE :1
20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170
20 713 696 531 1001 868 701 616 519 631 541 546 686 713 589 413 518
40 891 801 721 997 961 816 713 691 806 631 601 738 869 608 384 686
LINE :2
20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
20 486 416 410 536 616 510 498 486 716 813 1001 736 816 708 963
40 616 573 396 716 736 606 536 513 896 1001 1131 868 981 1001 1142
Figure6.1: Horizontal profiling results and curves for Line3A1-2A1
20 40 60 80 100 120 140 160 180
100
1000
10000
VES9
App.R
es(ohms-m
)
AB/2 (m)
20m
40m
LINE:1
VES8
20 40 60 80 100 120 140 160 180
100
1000
10000
VES11
App.R
es(ohms-m
)
AB/2 (m)
20m
40m
LINE:2
VES10
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Project : GTSF Community : Tarkwa
Client : AGA IDUPRIEM District :
Survey No.:VES8 Date :17-03-2011
AB/2(m) MN/2(m) P(V) C(I) R(ohm) Mult factor App Res
(ohm)
1 0.2 7.54
1.5 0.2 17.36
2 0.2 31.11
3 0.2 70.40
5 0.2 9.56 3.76 2.543 196.11 498.634
7 0.5 7.40 2.08 3.561 153.21 545.613
10 0.5 7.80 4.76 1.638 313.50 513.534
15 0.5 4.34 5.76 0.754 706.36 532.756
20 0.5 3.19 7.34 0.435 1256.36 546.132
25 5.0 15.04 5.02 2.994 188.57 564.523
30 5.0 9.56 4.52 2.116 275.00 581.878
35 5.0 6.29 4.02 1.563 377.14 589.645
40 5.0 10.27 8.45 1.215 495.00 601.534
50 5.0 6.48 7.45 0.870 777.86 676.423
58 5.0 4.51 6.75 0.669 1049.40 701.634
70 5.0 2.61 5.45 0.480 1532.14 734.845
80 10.0 7.42 9.34 0.794 990.00 786.212
90 10.0 7.44 11.430 0.651 1257.14 818.476
100 10.0 3.72 6.83 0.544 1555.71 846.332AB = distance between outer electrodes
MN=distance between inner electrodes Figure 6.2a: Vertical electric sounding curves for line3A1-2A1
P(V) = Potential R (ohm) = Resistance C(I) = Current
1 10 100 1000
10
100
1000
10000
App.R
es.(ohms-m
)
AB/2(m)
Schlumberger VES at Line1 -VES8
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Project : GTSF
Community :
Tarkwa
Client : AGA IDUPRIEM
District
:
Survey No.:VES9 Date :17-03-2011
AB/2(m) MN/2(m) P(V) C(I) R(ohm)
Mult
factor App Res
(ohm)
1 0.2 7.54
1.5 0.2 17.36
2 0.2 31.11
3 0.2 70.40
5 0.2 12.69 4.56 2.782 196.11 545.623
7 0.5 21.90 6.61 3.313 153.21 507.650
10 0.5 4.58 2.95 1.552 313.50 486.53415 0.5 2.48 3.83 0.647 706.36 456.760
20 0.5 1.01 3.07 0.329 1256.36 413.034
25 5.0 14.46 6.70 2.158 188.57 407.008
30 5.0 8.33 5.70 1.461 275.00 401.767
35 5.0 4.06 3.86 1.051 377.14 396.383
40 5.0 2.16 2.78 0.777 495.00 384.565
50 5.0 2.33 4.87 0.478 777.86 371.723
58 5.0 2.30 5.87 0.392 1049.40 411.808
70 5.0 1.89 6.07 0.311 1532.14 476.423
80 10.0 2.77 5.45 0.509 990.00 503.823
90 10.0 3.98 8.670 0.459 1257.14 576.509
100 10.0 2.90 7.43 0.390 1555.71 606.322
AB = distance between outer electrodes
MN=distance between inner electrodes Figure 6.2b: Vertical electric sounding curves for line3A1-2A1
P(V) = Potential R (ohm) = Resistance C(I) = Current
1 10 100 1000
10
100
1000
10000
App.R
es.(o
hms-m
)
AB/2(m)
Schlumberger VES at Line1 -VES9
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Project : GTSF Community : Tarkwa
Client : AGA IDUPRIEM District :
Survey No.:VES10 Date :17-03-2011
AB/2(m) MN/2(m) P(V) C(I) R(ohm)
Mult
factor App Res
(ohm)
1 0.2 7.54
1.5 0.2 17.36
2 0.2 31.11
3 0.2 70.40
5 0.2 9.13 3.43 2.661 196.11 521.767
7 0.5 14.74 4.53 3.255 153.21 498.657
10 0.5 7.92 5.21 1.520 313.50 476.513
15 0.5 2.36 3.67 0.642 706.36 453.323
20 0.5 0.68 2.07 0.327 1256.36 410.50825 5.0 8.61 3.87 2.225 188.57 419.645
30 5.0 9.46 6.45 1.466 275.00 403.138
35 5.0 4.61 4.34 1.062 377.14 400.645
40 5.0 1.85 2.31 0.802 495.00 396.745
50 5.0 3.20 6.45 0.497 777.86 386.434
58 5.0 1.93 5.03 0.384 1049.40 402.807
70 5.0 2.33 8.65 0.270 1532.14 413.323
80 10.0 1.86 4.53 0.411 990.00 406.867
90 10.0 1.43 3.77 0.381 1257.14 478.554
100 10.0 1.52 4.65 0.328 1555.71 509.665
AB = distance between outer electrodes
MN=distance between inner electrodes Figure 6.2c: Vertical electric sounding curves for line3A1-2A1
P(V) = Potential R (ohm) = Resistance C(I) = Current
1 10 100 1000
10
100
1000
10000
App.R
es.(
ohms-m
)
AB/2(m)
Schlumberger VES at Line2 -VES10
7/30/2019 hydrogeological investigations
24/24