NI43-101Pre-Feasibility Study Report - page 172

Rare Element Resources
Bear Lodge Project
Canadian NI 43-101 Technical Report
October 9
, 2014
10135-200-46 – Rev. 0
Standards Quality Control Graphs
An example of the results of the standard analyses is displayed in Figure 11.1 for
%TREO, which is representative of the entire series of rare earth element results.
Sequence numbers are presented on the x-axis and concentration on the y-axis. The
historical mean is indicated by the solid red line, and the ± 2 standard deviation
control limits are depicted by the dashed blue lines, located above and below the red
historical mean line. The ± 3 standard deviation control limits are depicted by the
dashed red lines and the ± 10% (of the mean) control limits are depicted by the
dashed green lines.
Visual examination of the quality control plots for %TREO reveals that the standard
analyses exceeding ± 2 standard deviations just exceed these control limits, but very
rarely exceed ± 3 standard deviations. None of the failures cluster, and the failures do
not occur systematically within any given analytical certificate for the rare earth
The 2009 and 2012-2013 Actlabs and 2010-2011 ALS analyses are within 2 percent
of one another for the 2009-2013 time period. One can see in Figure 11.1 for
Standards RE09003X and RE09006X that the Actlabs analyses display a better
precision than the ALS analyses but the analyses from both labs show comparable
accuracy. There is less than a 2 percent bias in comparable analyses between the
two laboratories.
The standards indicate that light rare earth element analyses from Actlabs and ALS
for the 2009-2013 drill programs are of acceptable accuracy for resource analyses.
1...,162,163,164,165,166,167,168,169,170,171 173,174,175,176,177,178,179,180,181,182,...587
Powered by FlippingBook