185
3 METHODOLOGY
The methodology investigates how the uncertainty of the mineral resources is influenced by
distinct data spacings and consists of the following steps (Fig. 1):
1. Exploratory Data Analysis and declustering;
2. Stratigraphic Correction;
3. Variogram analysis and modeling
4. Simulate realizations for reference distribution;
5. Sampling the simulated Reference Model at regular spacings n times to obtain databases
with regular data spacing;
Figure 1. Flowchart of resource uncertainty.
1
Exploratory Data Analysis
2
St rat igraphic Correction
6
Simulation (UGS) SOx
0.70
0.68
" '# 0.66
8
~
~ 0.64
Summarize .!!
uncertaint y ~ 0.62
measures ~
~ 0.60
0.58
25
I Hangt I I +I
Footwall
o.zs rc---~-DataHistogram
0.20
0.05
o.oo '-~~...d.Ll..ll..Ll_Lb__
20 30
40
50 60
Hangwall
I I
I
(25x25)
(lOOxlOO)
(200)1200)
(400x400)
(800x800) {1200x1200)
Uncertainty
. '
: i
9
~
\
8
e¥ $
~ \
~ 8
~\
a. •
• • 8 ~""
i""
100
200
400
800
1200
Gridssize{m)