PERMFILE104078

• Permit No: M1982090
• IBM Index Class Name: Permit File
• Doc Date: 4/22/1983
• Doc Name: CAMP BIRD MINE TAILINGS EMBANKMENT STABILITY ANALYSIS
• From: MLRD
• To: MIKE STANTON
• Media Type: D
• Archive: No

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DEPARTMENT OF t\. .. ~.,,,_999,,,,,,,,,,~5
D. Monte Pascoe. Execmrve Director
MINED LAND RECLAMATION DIVISION
DAVID C. SHELTON Director
Ric hartl D Lamm
Governor
DATE: April 22, 1983 _
T0: Mike Stanton )
FROM: Jim Pendleton °=- ~
RE: Camp Bird Mit~T ings Embankment Stability Analysis
Pursuant to your request, I have reviewed the report submitted by
Camp-Bird Colorado, Inc. for its Camp Bird Mine's proposed tailings
embankment expansion. The analysis and report were completed by Charles
C. Bowman and Associates, Inc. The analysis has been prepared in
accordance with the prudent state-of-the-art of slope stability analysis.
The report includes several recommendations for further monitoring and
construction techniques which I believe it is important to require the
applicant to conform with as conditions of an approval of the proposed
tailings embankment expansion;
(1) As the existing embankment is raised, the tailings embankment
material should be mechanically compacted in order to achieve a
relative density Df at least 70 percent.
(2) The western and northeastern extensions of the tailings embankment
should be constructed using the same methods which were employed
for the existing portions of the tailings embankment; including
adequately compacted starter dams using mine waste rock, the
installation of urtderdrains and decant towers, and proper topsoil
salvaging and subsoil scalping.
(3) Seepage water benns should be constructed adjacent to the toe of
the tailings embankment, immediately following approval of the
project. (This recommendation deviates from the consultant's
original recommendation.}
(4) Stand pipe piezometers should be located at a mutually agreed -~
interval along the crest and toe of the existing and extended i
embankments, in order to monitor any phreatic and ground water
level changes.
(5) The small proposed embankment located on the upslope side of the
proposed northeastern extension of the tailings embankment pond
should be constructed in the same manner as the downslope
embankment at the existing embankment pond.
/ep
cc: Joeseph G. Zalkind
Doc. No. 2436
423 Centennial Building, 131;i Sherman Street Denver, Colorado 80203 Tel. [phone]