ON EDIT :
birchmountain.com
Analytical Method Development
In March, 1999, Birch Mountain initiated an in-house program to develop analytical methods to resolve inconsistencies between SEM/EMP imaging and precious metals analysis, and to address the problem of repeatability. By adjusting experimental conditions, by carefully recording experimental conditions, and by systematically varying key parameters, Birch Mountain is deliberately striving to identify and control the variables causing the erratic results. We are using Birch Mountain's laboratory, and facilities and analytical instrumentation available in the Department of Geology at the University of Calgary. Significant results from Birch Mountain's recent in-house work are given in Table 5. Atomic absorption measurements carried out by Birch Mountain at the University of Calgary utilized three point standard additions calibration and deuterium arc background correction.
Table 5. Summary of Birch Mountain in-house analytical method development results, 1998 bulk sample BJ98-008.
Digest
Extraction
Collector
Analysis Type
Au (g/t)
Pt (g/t)
Pd (g/t)
Reductive
Static
None
FA/ICP3
0.593
0.132
0.015
Caustic
Bottle roll
Adsorption
FA/ICP
0.008
0.002
1.01
Acidic
Bottle roll
Adsorption
FA/ICP
0.008
0.004
1.90
Caustic
Bottle roll
Adsorption
FA/ICP
0.009
nd
0.558
Acidic
Static
Chiddey
FA/ICP
0.0008
nd
0.427
Acidic
Static
None
AA4
4 to 6
na
na
3Fire assay - ICP; Loring Laboratories Ltd., Calgary, AB.
4Atomic absorption, University of Calgary, Calgary, AB.
na — not analyzed; nd — not detected
Although Birch Mountain's testing has shown important values of gold and palladium, we have not yet been able to reproduce "hits" despite careful attention to replicating the conditions and procedures of runs which yielded positive results. We can not yet explain this lack of repeatability. It is unlikely, however, that contamination is responsible because we obtain similar results using different methods and laboratories. Results for sample BJ98-008 are summarized in Table 6.
Table 6. Summary of assay and leach results, 1998 bulk sample BJ98-008.
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