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a)
b)
10 4
10 5
Channel
Channel
2
F
5
10 3
10 4
6
3
B
8
10
E
4
5
B
12
14
10 2
10 3
C
A
6
7
8
9
10
11
16
E
18
20
22
24
26
28
30
32
34
10 1
10 2
A
D
10 0
E
10 1
12
13
15
B
C
0
10 0
0
Location
Location
Base of
weathering
Base of
weathering
0
200
Metres
Mineralisation
Phyllite
Silicified
Carbonaceous
Phanerozoic cover
Andesitic volcanics
Massive
Pb-Zn
Shear zone
Stringer
Cu-A
0
200
u
Metres
Mineralised breccia
c)
C hannel
10 4
4
d)
Early time
10 3
8
400
B
A
12
200
10 2
Late time
16
0
10 1
B
18
10 0
8
Early time
20
22
A
0
4
A
-10 0
0
Location
Location
Loop
High-grade Cu mineralisation
Cover
Meta-arenite
Meta-arenite with mafic-
silicic alteration
Mineralisation (>1.5% Ni)
Fault
Amphibolite
Schist
Ultramafics
Volcanics
Gabbro
0
200
0
100
Metres
Metres
Figure 5.89 Ground EM data from various mineral deposits. (a) Ernest Henry IOCG deposit, redrawn, with permission, from Webb and
Rowston ( 1995 ) and Asten ( 2000 ), (b) Trilogy VMS deposit, redrawn, with permission, from Sampson and Bourne ( 2001 ), (c) Eloise SEDEX
deposit, redrawn, with permission, from Brescianini et al.( 1992 ) , and (d) Tripod nickel sulphide deposit, redrawn, with permission, from
Osmond et al.( 2002 ) . The blue squares in (b) and (c) are the points defining the decays shown in Fig. 5.81 . Note the different vertical scales.
 
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