1989-12-22_REVISION - M1988112 ‎(3)‎

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 12/22/1989
• Doc Name: ADEQUACY REVIEW AMENDMANT 1 SAN LUIS PROJECT BATTLE MOUNTAIN GOLD FN M-88-112
• From: MLRD
• To: STEVE RENNER
• Type & Sequence: AM1
• Media Type: D
• Archive: No

•
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'~ STATE OF COLORADO
MINED LAND RECLAMATION DIVISION
Department of Natural Resources
1313 Sherman St., Roam 215
Denver, CO 80203
303 866-3567
Fn%:303 832-8106
DATE: December 22, 1989
T0: Steve Renner
FROM: John T. Doerfer
RE: Adequacy Review, Amendment No. 1, San Luis Protect
Battle Mountain Gold, File No. M-88-112
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~ re 76 ~
Roy Ramer,
Gorermr
Fretl R. Banra,
Division Director
As you requested, I have reviewed selected portions of the above-referenced
amendment application. My review concerned primarily the hydrologic aspects
of the plan. My comments following review are provided below:
D. 5 Mill Facilities
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 heating the
tailings slurry prior to disposal. An equilibrium diagram i:a 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 correspondin<q volumes of
spills will be detoxified by the amounts of reagents stored on site?
5. The results of the depositional modeling tests as to expected cyanide
concentrations in the tailings have not yet been submitted. As mentioned
on page D-29, this information should be submitted for incorporation in
the document review process.