1990-01-19_REVISION - M1988112 ‎(7)‎

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 1/19/1990
• Doc Name: FAX COVER
• From: STEFFEN ROBERTSON & KIRSTEN
• To: STEVE RENNER
• Type & Sequence: AM1
• Media Type: D
• Archive: No

90 @li1B 17:59 S 303 985 9947 SR Y, DENVER

BATTLE MOUNTAIN RESOURCES, 1NC.
ADEQUACY RESPONSES - ADDITIONAL INFORMATION
PAGE 1 OF 7
The comment wes satisfactorily addressed in the January 9, 1990 submittal.
Please provide clarification on the difference between the two tailings
sample geochemical testing results presented (1396.4-2.0 and 1396.4-2.1J.
In addition, some explanation of the humidity cell testing program was
requested. Since the data is incomplete, please commit to providing final
test results and developing mitigation measures if the test results
indicate any problems.
Two samples of tailings were tested as part of the geochemical testing
program for the San Luis Pro,~ect. Sample 1396.4-2.0 was an as-received
sample of the tailings solids which was submitted to a batch test and a
humidity cell test. Sample 1396.0.-2.1 was a. sample which was rinsed with
rain water to simulate long term conditions of the tailings ;i.e. after
all added buffering capabilities have been leached from the tailings). This
sample was also sub,)ected to batch and humidity cell testing.
Humidity cell testing for the San Luis tailings is currently ongoing. On
the balls of the test results to date, BMR believes that no additional
mitigation measures are necessary. BMR will Submit-further supporting data
within 6 weeks of this letter. BMR will commit to the development and
mitigation of an appropriate mitigation plan, if warranted.
The data for the amount of sulfuric acid to be stored on site presented
in Attachment 2 differs from the data presented in the Emergency Response
Plan. Please clarify.
Battle Mountain Resources is currently developing preliminary midi facility
designs and performing a preliminary evaluation of equipment availability
and needs. Based on this evaluation, a standard tank size of 10,000 gallons
is expected to be used at the San Luis Pro,lect instead of the tank size
of 6,500 gallons discussed in the emergency response plan. The sulfuric
acid tank will be designed for full containment in the unlikely event of
a tank leak or rupture. Containment of the sulfuric acid tank will be
separated from other containment provided in the mill design.
4. What corresponding volumes of spills will be detoxified by the amounts of
reagents stored on site?
Assuming a conservative ratio of 7 pound. ,,, hypochlorite to detoxify 1
pound of sodium cyanide.
@3
2,000 lbs hypochlorite/7 pounds to detox~f~ ' ~oun~ of cyaniae - 285.7
pounds of cyanide detoxified.