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6000
4000
1800
2000
A
B
B
A
2000
1800
Limestone
Syenite
Trachyte
0
100
0
500
Garnet-epidote skarn
Metres
Metres
Ore zone
b)
0
50
Bouguer
gravity
(gu)
Metres
B
70
50
50
60
50
A
Discovery
outcrop
B
60
60
50
50
Chromite
Serpentinite & peridotite
A
c)
B
3000
2000
2000
EM conductor
Shaft
A
B
3000
2600
Overburden
Iron formation
Peridotite
0
200
Drillholes
2000
Granite gneiss
Metres
Sedimentary rocks
A
Ore zone
Residual
gravity
(g
u
)
d)
0
0
5
Kilometres
-150
A
A
B
0
-40
-80
-120
Raniganj Series
0
2
Barren Measures
Kilometres
Barakar Series
Talchir Series
Basement (gneisses)
B
Coal seam
Figure 3.77
Gravity and magnetic responses associated with various types of mineralisation. (a) Aeromagnetic response of the Marmora
magnetite skarn, Ontario, Canada. Redrawn, with permission, fromWahl and Lake (
1957
); (b) the positive gravity anomaly associated with the
Gölalan Cr deposit, southeastern Elazi
, Turkey. Redrawn, with permission, from Yüngül (
1956
); (c) magnetic response of the Thompson Ni
deposit, Manitoba, Canada. Redrawn, with permission, from Dowsett (
1967
)
; (d) gravity response of the sedimentary basin hosting the Jharia
Coal
ğ
eld, Jharkhand, India. Redrawn, with permission, from Verma et al.(
1979
).
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