188
Figure 2. Variograms of normalized data.
Figure 3. Grand tonnage curve of the all SGS.
Grade-Tonnage curves are a graphical representation of the impact of cut-off grades on
the mineral resources. The Grade-Tonnage Curves display the tonnage and grade above cutoff grade for a series of cut-offs. As the criteria for ore classification becomes more selective,
Variogram downhole
it~/ > 0.2
0. ·~(---------,--:
T
:_
2
3
Lag Distance
1.00
(ij
0
t:
0.80
0
" 0.60
0
. B
.£ 0.40
I
g'.,
"'
" " 0.20
0
....
0.00
(25x 25)
12.0 22.0 3 2.0 24.0
Cut-off Grade
1.00
(ij
0
.... 0.80
'0
" 0.60
0
.t
.£ 0.40
I
"'
..,
"'
" " 0.20
0
....
0.00
(200x200)
12.0 22.0 32.0 24.0
Cut-off Grade
1.00
(ij
0
.... 0.80
... 0
" 0.60
0
~
~ 0.40
I
"'
..,
"'
" c: 0.20
0
....
0.00
{SOOxSOO)
12.0 22.0 32.0 24.0
Cut-off Grade
1.00
0.80
" ~ o.60 1
•
_ g 0.40
~ 0.20
0.00 - -
1.00
0.80
e o.60
e
_ g 0.40
~ 0 .20
0.0
200
400 600
Lag Distance
800 1000
o.oo • - - - - - - - - - - - : -
o.o
200
400 600
800 1000
lag Distance
60.0
1.00
60.0
50.0
(ij
50.0
lt:
0 0.80
lt:
9
....
9
40.0 8
0
40.0 8
" 0.60
"'
0
"'
30.0 _g
. B
>
.£
30.0 ..8
"'
0.40
"'
20.0~
I
"'
g'.,
20.0 lil
i5 "'
i5
"
. 10.0
" 0.20
10.0
0
....
0.00
0.00
(100x 100)
0.00
12.0 22.0 32.0 24.0
Cut-off Grade
1.00
60.0
50.0
(ij
50.0
lt:
0 0.80
lt:
9 ....
9
4o.o a '0
40.0 8
" 0.60
"'
0
"'
30.0 _g · t
>
.£
30.0 ..8
"'
0.40
"'
"'
I
"'
20.0 lil "'
20.0 lil
i5
..,
i5
"'
"
10.0
" 0.20
10.0
0
....
0.00
0.00
(400x400)
0.00
52.0
12.0 22.0 32.0 24.0
Cut-off Grade
60.0
1.00
60.0
50.0
(ij
50.0
lt: 0 0.80
lt:
9 ....
9
...
4o.o a 0
4o.o a
c: 0.60
"'
0
"'
> . B
30.0 _g
30.0 _g .£
"'
0.40
"'
"'
I
"'
20.0 1.l g'.,
20.0 lil
i5
i5
"'
"
10.0
" 0.20
10.0
0
....
0.00
0.00
(1200x 1200)
0.00
52.0
12.0 22.0 32.0 24.0 52.0
Cut-off Grade