Gravity and magnetic methods - Geophysics for the Mineral Exploration Geoscientist - page 122

3.7.1 Choice of enhancements

sources of anomalies. The magnetic survey was con-
ducted at a terrain clearance of 60 m with the survey
lines spaced 100 m and oriented east

Enhancements are applied to potential field data to trans-
form complex responses to simplified forms more
directly related to their sources, and to improve the
resolution of particular features in the data. Filters that

- west. The area

is located in the southern magnetic hemisphere

(Inc ¼ - 44°, Dec ¼ - 5.5°).

a) b)

0 5

Kilometres

7

7

Broken Hill deposit

c) d)

1

3

1

2

e) f)

4

Figure 3.28 TMI data for the vicinity of the Broken Hill Pb - Zn - Ag deposit. (a) TMI, (b) TMI reduced to pole, (c) first vertical derivative of

TMI, (d) first vertical derivative of TMI reduced to pole, (e) second vertical derivative, (f) 3D analytic signal, (g) tilt derivative, (h) total

horizontal gradient of pseudogravity, and (i) pseudogravity. These data are used with the permission of Geoscience Australia.