1989-12-18_REVISION - M1988112 ‎(8)‎

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 12/18/1989
• Doc Name: SAN LUIS PROJECT PERMIT AMENDMENT
• From: MLRD
• To: BATTLE MTN RESOURCES
• Type & Sequence: AM1
• Media Type: D
• Archive: No

• ~ •.
San Luis Project
Amendment Application
Adequacy Review
Exhi bit D, Mining Plan
1. On page D-14, reference to a "dilute cyanide solution" is made in
discussing the carbon-in-leach method of ore processing. What is the
expected concentration of cyanide in this process solution?
2. On page D-16, reference is made to use of sulfuric acid in treating the
tailings slurry prior to disposal. An equilibrium diagram is provided to
indicate that 70% of the cyanide will be volatilized at pH 9. What is
the expected concentration of free cyanide in the treated slurry solution?
3. The emergency response plan identifies 6,500 gallons of sulfuric acid as
being located on site. At expected production levels, what 'is the daily
requirement or consumption of sulfuric acid? Will sulfuric .acid be used
as a detoxifying reagent in an emergency spill situation?
4. Hydrogen peroxide and alkaline chlorination are referenced for use in
the emergency response plan for cyanide detoxification. What reagent
will be used for alkaline chlorination? With reference to Table 4.1 in
the emergency response plan (Exhibit M), what volumes of reagents will be
available for detoxification purposes? What corresponding volumes of
spills will be detoxified by the amounts of reagents stored on site?
5. Please provide the mill facility design criteria to demonstrate that any
solution or chemical spill would not discharge from the facility. Floor
construction, internal curbing, solution collection and backoup system
design specifications should be submitted.
6. Please provide the security management plan for the cyanide storage area.
Please demonstrate the validity of the statement that the tails disposal
facility is located in an arroyo tributary to Culebra Creek, and not
Rito Seco. A map or other survey which depicts the drainage and flow
routing from the facility to Culebra Creek should be submitted. This map
or survey should also depict the Rito Seco drainage area from the mine
facility to below San Luis for comparative purposes.
8. The results of the depositional
concentrations in the tailings
on page D-29, this information
the amendment review process.
modeling tests as to expected cyanide
have not yet been submitted. As mentioned
should be submitted for incorporation in
The results of the tailings geochemical test program have not be
submitted as noted on page D-31. The results of the geochemical testing
(Appendix F) should be provided. In addition, any modifications to the
analytical testing or ore processing being modeled which would affect
geochemical characteristics of the tailings between original permit
approval and the amendment proposal should be discussed. This discussion
should consider expected concentrations of cyanide, salts, metals, and
acidity of both tailing solids and leachates.
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