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a
b
2
2
1.6
1.6
1.2
1.2
0.8
0.8
0.4
0.4
0
0.5
0
0.5
0.5
1.5 2.5
Log Au
3.5
4.5
0.5
1.5
2.5
3.5
Log As
c
d
2
2
1.6
1.6
1.2
1.2
0.8
0.8
0.4
0.4
0
0
1
0.5
0
1
2
3
0
0.5
1
1.5
2
Log Ag
Log Pb
e
f
2
2
1.6
1.6
1.2
1.2
0.8
0.8
0.4
0.4
0
0
1
0
1
2
3
1
0
1
2
3
4
Log Sb
Log Cu
Fig. 10.6 Log-log plots representing the relationships between areas bounded by contours
(as shown for Au and Cu in Fig. 10.5 ), and contour value for four elements, Mitchell-Sulphurets
area. Straight line segments were fitted by least squares (Source: Cheng et al. 1994 , Fig. 6)
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