US EPA REGION 8The US Environmental Protection Agency (Region 8)...

US EPA REGION 8

The US Environmental Protection Agency (Region 8) has concluded its
report on the initial trials at the Gilt Edge Mine Site in South
Dakota and a link to their full report will be provided on the
Company website in the next few weeks. At this stage we are working
with the US EPA on the planning for the next stage of the trials to
be conducted on the site, and expect this work to commence early
2003.



An Ongoing Evaluation of Bauxsol at the Gilt Edge Mine, South Dakota

Jim Jonas
CDM Federal Programs Corporation
Ken Wangerud
EPA Region VIII, RPM
David McConchie
Southern Cross University

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Pit Lake Treatment Simulation Results
.
Results that
did not meet
SD water quality criteria
(acute):–
Cond., NO3,
and
Se

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.
Median of results:
.
Less than one pore
volume was released
during the first year
.
Parameters that did not
meet SD water quality
criteria:–
Conductivity (not
shown),
TDS,
SAR,
Se
0.041 Selenium (mg/
L)

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.
Conductivity,
TDS,
SAR,
and Selenium did not
meet criteria

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Future Investigations
.
Bottle roll
–
Short-
term test
–
Multiple bottles with varying Bauxsol/
ARD
ratios
.
Column Tests
–
Long-
term test
–
Multiple columns at varying flow rates