Geoscience Reference
In-Depth Information
Fig. 14.23 Resource classification, Bench 2440m
Each block is coded as OXSI or OXSA if oxide, and SNSI
or SNSA if sulfide, if the estimated indicators is greater or
equal to 0.5 (hard rock, no argillic alteration), or less than 0.5
(soft rock, with argillic alteration), respectively.
Carga Puntual, OXSI
Number of Data
291
number trimmed
1395
mean
1.6015
0.100
std. dev.
0.7914
coef. of var
0.4941
maximum
4.9100
0.080
90th quantile
2.6107
upper quartile
2.1000
median
1.5800
lower quartile
1.0000
14.1.26
Estimation of Point Load
0.060
10th quantile
0.6100
minimum
0.0700
The Point Load test measures resistance of the rock (drill
hole diamond core) to axial compression. There is known
relationship between Point Load and the Geometallurgical
Unit, demonstrated by tests from production areas, where
samples are taken and its Point Load determined. These
values have been used to date mostly to determine optimal
parameters and design of the blast patterns, sequences and
timing, explosive charges, etc.
There were 1,591 Point Load values available in the drill
hole database to build this model, the same intervals for
which specific gravity was determined. There is a very good
correlation between Point Load and the presence of argillic
alteration, which allows for an indicator model to be used to
ensure consistency. Figures 14.24 and 14.25 show the values
0.040
0.020
0.000
0.00
1.00
2.00
3.00
4.00
IS_50
Fig. 14.24 Histogram and basic statistics, Point Load, OXSI
of Point Load for drill hole intervals logged as OXSI and
OXSA, respectively.
Limiting values describing the relationship between Point
Load and the GMUs were defined based on field experience:
 
Search WWH ::




Custom Search