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KE
GS
Sy
mp
osi
um
20
11
Gra
vit
y C
ase
Stu
dy
of
the
Po
do
lsk
yD
ep
osi
t, S
ud
bu
ry B
asi
n
Eli
zab
eth
Ba
ran
yi &
Ro
be
rt E
llis
Sander Geophysics Ltd
Ge
olo
gy
–S
ud
bu
ry B
asi
nPodolsky
Podolsky
Su
db
ury
Ba
sin
2 / 8
Gravity Case Study of Podolsky Deposit, Sudbury Basin E Baranyi & R Ellis
Podolsky Property
Airborne Gravity
Airborne Magnetics
LiDAR ElevationDa
ta c
ove
rag
e Nickel
Ramp
North
Deposit
3 / 8
Gravity Case Study of Podolsky Deposit, Sudbury Basin E Baranyi & R Ellis
•D
ata
min
e
mo
de
l
LiDAR Elevation
Density Voxels
2000
Deposit
•In
vers
ion
co
nsi
de
rati
on
s
No
n-u
niq
ue
pro
cess
A p
rio
ri i
nfo
rma
tio
n
Co
mp
lem
en
tary
ge
op
hys
ica
l d
ata
3D
In
vers
ion
Ove
rvie
w -
De
fin
itio
n
•P
ract
ica
l so
luti
on
Ro
bu
st
Sim
ple
Eff
icie
nt
4 / 8
Gravity Case Study of Podolsky Deposit, Sudbury Basin E Baranyi & R Ellis
Po
do
lsk
y
Str
uct
ure
Nickel
Ramp
5/ 8
Gravity Case Study of Podolsky Deposit, Sudbury Basin E Baranyi & R Ellis
•N
i R
am
p d
ep
osi
t
Be
nch
ma
rk:
Un
con
stra
ine
d
Gra
vit
y I
nve
rsio
n
C0
ba
sed
on
Occ
am
cri
teri
on
Po
or
corr
ela
tio
n w
ith
ge
olo
gy
Un
con
stra
ine
d G
rav
ity
In
vers
ion
Po
or
corr
ela
tio
n w
ith
ge
olo
gy
6/ 8
Gravity Case Study of Podolsky Deposit, Sudbury Basin E Baranyi & R Ellis
Density contrast 0.6 g/cm3
Co
nst
rain
ed
In
vers
ion
Invert magnetic data
Create Gravity model
covariance from
magnetic model
7/ 8
Gravity Case Study of Podolsky Deposit, Sudbury Basin E Baranyi & R Ellis
Invert gravity data
Good correlation with
known geology
Density contrast isosurfaces
1.8 & 1.0 g/cm3
•B
ett
er
reso
lve
d in
terp
reta
tio
n d
ue
to
:
Be
tte
r a
irb
orn
e g
ravit
y/m
ag
inst
rum
en
tati
on
De
nse
r d
ata
co
lle
ctio
n
Larg
e s
tora
ge
ca
pa
city
Ava
ila
bil
ity
of
hig
h p
ow
er
com
pu
tati
on
Co
ncl
usi
on
s
Ava
ila
bil
ity
of
hig
h p
ow
er
com
pu
tati
on
•P
rove
n I
nve
rsio
n t
ech
niq
ue
s
Co
nst
rain
ed
3D
in
vers
ion
yie
lds
mo
re r
ea
list
ic
resu
lts
Imp
rove
d o
pti
miz
ed
alg
ori
thm
s
Dis
pla
y 3
D i
nve
rsio
n t
ech
niq
ue
8 /8
Gravity Case Study of Podolsky Deposit, Sudbury Basin E Baranyi & R Ellis
