The document outlines the steps for developing a quality assurance and quality control (QA/QC) program for field sampling. It discusses: 1) Designing the QA/QC program, including minimizing sources of imprecision and contamination. 2) Descriptions of common QC samples like standards, duplicates, and blanks used to assess precision and reproducibility. 3) Implementing the QA/QC program for field work, including taking QC samples at regular intervals. 4) Testing the quality of the QA/QC program and actions to take if QC samples fail standards. 5) The flowsheet for sampling preparation. 6) Naming rocks and alterations in the field using a standardized naming system

1. STEP
02
STEP
03
STEP
01
STEP
05
STEP
06
STEP
04
Design of the QA&QC
program
Descriptions of common
QC samples
QA & QC program for
the Field Work
Program
Testing the quality of
the QA&QC program
Flowsheet for Sampling
Preparation
Naming Rocks and
Alterations in the
Field

2. STEP
01
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
S t e p 1 : D e s i g n o f t h e
Q A & Q C p ro g r a m
The field quality assurance program is
simply a series of basic precautions
that are necessarily obeyed if the
program is to be a success. These
precautions are generally a matter of
ensuring that the field staff maintains
consistency and that they are diligent
while in the process of collecting,
labeling, and shipping samples.
The program design must incorporate
appropriate quality control techniques
for minimizing potential imprecision
and bias in the data
Contamination is a more complex
problem to address. The major sources of
contamination include:
• Contamination by field
staff during sample collection
• Contamination from the
sampling device
• Contamination from the
sample bag, and/or
• Contamination during
sample processing (such as from
atmospheric deposition, wind, dust,
etc.).

3. STEP
02
Descriptions of common
QC samples
Standard samples are used to
document the bias and precision of the
analytical (laboratory) process.
External control checks for the precision
and reproducibility of the results of the
main laboratory.
Duplicate samples are often collected at
one or more sites to assess precision of
the entire program.
Blanks may be of paramount
importance if erratic results are
obtained.

4. STEP
03
QA & QC program for
the Field Work Program
It is undoubtable better to randomly
select the samples to be included in the
QA&QC program, but this method has
the potential to generate too many
human errors. It is then better for
practical reasons to take these QC
samples at specific intervals. For
example, if you will have three blanks
every 100 samples, you can decide to
take samples 32, 62, and 92 as blanks.
The sequence is shown on Figures 1
and 2 for the full sequence of samples

5. STEP
04
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Y o u c a n r e p l a c e y o u r t e x t
h e r e . T h i s i s t h e
p l a c e h o l d e r c o l u m n .
Testing the quality of
the QA&QC program
When a QC sample fails, the first thing
that should be done is to check for a
human error first in the company,
second in the lab. If a blank fail, the lab
should repeat 5 samples from the blank
that fail, starting from the original
material of the sample, not from the
pulp. If a standard fail, the lab should
repeat the test for 25 samples before and
25 samples after the standard that fail.
In this case the laboratory can use
directly the pulps
The testing of the QC samples should be
done immediately as the Company
receive the results and the laboratory
should be informed the same day if
there are some problems with the QC
samples.
For a Blank to fail, it must be at least
10 times higher than the limit of
detection of the used lab.
For a standard to fail, it should be
higher than the average value ± twice
the standard deviation of the value on
the label of the standard.

6. STEP
05
Flowsheet for
Sampling Preparation

7. STEP
06
Naming Rocks and
Alterations in the Field The BGS recommends a simple system
for typing and writing names of rocks
and the specific use of hyphens when
combining names with names,
qualifiers with names, and qualifiers
with qualifiers. Table 3 shows these
main codes.
It is very important to have consistency
in naming rocks in the field, since
systematic errors are much easier to
correct then casual ones. Any field
description during logging or mapping
within a project should adhere to the
flowing model:
ALTERATION / (QUALIFIER &
NAME) / TEXTURE /
MINERALIZATION

8. STEP
01
STEP
02
STEP
03
STEP
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STEP
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STEP
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