ENFORCE20318

• Permit No: M1988112
• IBM Index Class Name: Enforcement
• Doc Date: 8/24/1992
• Doc Name: LONG TERM DETOXIFICATION OF BATTLE MTN GOLD TAILINGS
• From: MLRD
• To: BATTLE MTN GOLD FN M-88-112
• Media Type: D
• Archive: No

~ III IIIIIIIIIIIIIIII

STATEOF
MINED LAND RECLAMATION DIVISION
Department of Natural Resources
1313 Sherman S1., Room 215
Denver, CO 80203
303 866-3567
FA%: 303 832 8106
~ArE.
lo.
FROM:
RE.
August 24, 1992
The Battle Mountain Gol
Jim Pendleton
Long-Term
In response to an
have prepared the
detoxification of
project.
Background
F COQ
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tip, Ry
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Roy Romer,
Gwemor
Michael B. Long,
Division Drtector
on of the Battle Mountain Gold >•ailin~s
informational request from board member Luke Danie~son, I
following summary of expectations regarding the to g-term
tailings within BMRI's tailings impoundment at the, San Luis
On March 30, 1992, the Division became aware that the cyanide levels within
the tailings impoundment at BMRI's San Luis project were well in exc ss of the
permitted levels of 4.4 ppm total cyanide and 3.8 weak acid dissocia le (WAD)
cyanide. In fact the total/WAD cyanide had attained levels of as hi h as
270 ppm/230 ppm in the lower tailings pond, 150 ppm/110 ppm in the u per
tailings pond, and 160 ppm/I10 ppm in the collection pond as of earl June,
1992, as shown in the following brief summary of cyanide monitoring ata.
Lower Tailings Pond
Date Total (ppm) W.A.D.
9/13/91 130
(/30/92 240
4/24/92 210
5/28/92 230
6/11/92 270
7/03/92
7/07/92
7/09/92
7/20192
[H2O2
110
210
210
200
230
Treatment Begun
31
12
Upper Tailings Pond
Total (ppm) W.A.D.
(Permit M-88-112)
Collec ion Pond
Total ( pm) W.A.D.
40
Treatment Begun
10
1
110 84
150 110
150 110
in Lower Pondl
CH2O2
7/22192 57 16 15
[Low % Copper Ore Processed]
d/03/92 4
3/12/92 3
150 140
160 110
160 77
in Upper Pend]
100 52
50
46