63
In a 2D study, the mean thickness (global or local) of the deposit or the domain should be
known to calculate the volume of each simulated block and to group it into bigger units that
corresponds to production units.
The variance of the 100 realizations of each drilling spacing is calculated within a 90% CI,
using the quantiles of 5% (Q05) and 95% (Q95) and the mean of simulations (see Figure 4) as
shown Equation Accuracy
The mean of s
o imulations
(
%
IC
)
/
Q
Q
* 2
Q
(2):
Accuracy
Q
Q
The mean of s
o imulations
9
05
2
*
(
)
IC 90% =
(2)
Assuming a normal distribution, the accuracy can also be calculated as follows Equation 3
(Verly et al. 2014):
Accurancy
T
c
he
T T mean of simulations
t
*
(
)
IC %
90
/
*
(3)
where σ t is the standard deviation of the simulations.
Figure 3. Virtual drillholes for one of the selected virtual realities. Plant view.
Virtui!ll Drillhole Ml8
100x100m
Virtui!ll Drill hole Ml8
.100x150m
.. SOOOm Ill
.. SOOOm Ill
Virtui!ll Drillhole M)8
100x200m
Virtui!ll Drill hole Ml8
100x250m
4 5000m ..
Virtui!ll Drillhole #08
100x300m
Virtui!ll Drill hole #08
100x400m
4 :;QQQ m ..
4 :;QQQ m ..