Specific Standards - Geochemistry I - Lecture Slides, Slides of Geochemistry

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Certified Reference Material (CRM’s)

New standard

certificates include

the Between Lab

Standard Deviation,

which is to be used in

assessing accuracy of

a single analysis.

Property Specific Standards

Round Robin

analysis and

statistical

calculations.

Analytical Order

Property Specific Standards

Field Screw Ups

Failed standards

caused by poor

sample storage and

contamination of

standard in field.

Standard C3, Au

CM

CM

CM

CM

CM

CM

CMCM

CM

CM

SGS

SGS

SGS

SGS

SGS

SGS

SGS

SGS

SGS

SGS

GL

GL

GL

GL

GL

GL

GL

GL

GL

GL

BC

BC

BC

BC

BC

BC

BCBC

BC

BC

ACT

ACT

ACT

ACT

ACT

ACT

ACT

ACT

ACT

ACT

AC

AC

AC

AC

AC

AC

AC

AC

AC

AC

Analysis Number

Au, gpt

Standards in drill samples

Property Specific Standards

Inventing ways to

screw up.

Give the standard

a name in the data

base. Wrong

standard selected

in the field.

Work Order Number

Gold, g/t

Failure

Failure

Property Specific Standards

Field standard

showing both drift

and change in

instrument.

Porphyry Copper Project

0 100 200 300 400 500 600

Analysis Number

Cu, %

5 % difference in average grade

Calibration drift

The Use of Field Blank

Most contamination

occurs during sample

preparation. Blanks

must therefore be

submitted from the

field to the preparation

laboratory.

Field Blanks, Preparation Contamination

Drill Hole Number

Silver, gpt

Warning Level

Failed Blanks

The Use of Field Blank

The beginning of a

drilling program

usually has the most

failures, as the

laboratory becomes

accustomed to the

samples.

Field Blank

P-

P-

P-24P-

P-

P-

P-

P-24P-

P-

P-

P-25P-25P-25P-

P-

P-

P-25P-26P-26P-26P-26P-26P-26P-26P-26P-26P-

P-

P-27P-

P-

P-

P-

P-27P-27P-

P-

P-28P-28P-28P-28P-28P-28P-28P-28P-28P-

P-29P-29P-

P-29P-29P-29P-29P-29P-30P-30P-30P-30P-30P-30P-30P-30P-30P-31P-31P-31P-31P-31P-31P-31P-31P-31P-32P-32P-32P-32P-32P-32P-32P-32P-32P-32P-33P-33P-33P-33P-33P-33P-33P-33P-34P-34P-34P-34P-34P-34P-34P-34P-35P-35P-35P-35P-35P-

P-

P-35P-36P-36P-36P-36P-36P-

P-

P-37P-38P-38P-38P-38P-38P-38P-38P-

P-

Number of Samples

Assay Grade (Au gr/T)

Drill Hole Number

Warning Level