Gravity and magnetic methods - Geophysics for the Mineral Exploration Geoscientist - page 174

e)

Y Y' Y Y'

0 0

200 200

400 400

600 600

0 200

Metres

0 200

Metres

800 800

1000 1000

Unconstrained Constrained

Y Y'

0

200

1.0
0.1
0.01
0.001

400

600

0 200

Metres

Susceptibility
(SI)

800

1000

Observed

f)

Z = 200 m Z = 200 m Z = 200 m

Observed

Y' Unconstrained Y' Constrained Y'

0 200

Metres

0 200

Metres

0 200

Metres

Y Y Y

Z = 400 m Z = 400 m Z = 400 m

Observed Unconstrained Constrained

Y' Y' Y'

0 200

Metres

0 200

Metres

0 200

Metres

Y Y Y

Figure 3.71 (cont.) the cross-sections and depth slices, respectively, shown in (e) and (f). (e) Observed and modelled susceptibility distributions
along cross-sections below Y - Y 0 . (f) Observed and modelled susceptibility distributions along depth slices 200 and 400 m below the surface.
The dashed lines in (e) and (f) represent the limits of reliable subsurface susceptibility data. Magnetic and susceptibility data reproduced
with the permission of Barrick (Australia Pacific) Ltd. Susceptibility model created and supplied by Mines Geophysical Services. Euler
deconvolution by Cowan Geodata Services.