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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
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