GENERAL34920

• Permit No: C1981038
• IBM Index Class Name: General Documents
• Doc Date: 2/3/1983
• Doc Name: CWIS WASTE ROCK DISPOSAL PLAN
• From: MLRD
• To: BOB LIDDLE
• Permit Index Doc Type: STIPULATIONS
• Media Type: D
• Archive: No

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R~cnartl D. Lamm
Governor
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DEPARTMENT OF NATURAL RESOURCES 99g
D. Monte Pascoe. Execu bve Dueclor
MINED LAND RECLAMATION DIVISION
DAVID C. SHElTON Director
February 3, 1983
T0: Bob Liddle
FROM: Jim Pendleton ~~
RE: CWI's Waste Route Di
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1 Plan
Pursuant to your request, I have reviewed the waste rock disposal site
plan and supporting stability calculations submitted by CWI fur
implementation at their Orchard Valley Mine. These documents were
prepared and submitted in accordance with stipulation No. lb of Permit
No. C-038-81. The plan and stability analysis have been prepared by
Geo-Hydro Consulting, Inc., consultant to the operator.
Briefly, the plan consists of three phases. Pflase I consists of a waste
pile to be constructed on the "West Ridge" site, immediately adjoining
t)le southwestern toe of the lowest existing fill bench at the Orchard
Valley Mine surface facilities. This terraced pile is proposed to
accommodate 130,000 cubic yards of waste and fulfill the mine's waste
disposal requirements for a period of 8.8 years. Phase II consists of an
analogous, but smaller, waste pile to be constructed on the "East Ridge"
site, immediately east of the Phase I pile. Phase II will contain 60,500
cubic yards of waste and require approximately 4 years to construct.
Phases I and II are separated by a natural ephemeral drainage channel.
Phase III of the proposed waste pile plan consists of a plan to fill the
drainage separating East and West Ridges, as well as the imposition of an
additional 530,000 cubic yards of material on top of the original Phase I
and II waste piles. This is projected to occur over a life span of 36
additional years. The total life of the three phases will be 49 years
and encompass the disposal of 130,000 cubic yards of processed waste.
The docunents submitted present a detailed plan and stability analysis
for Phase I of the waste pile. The documents clearly and unambiguously
state that the plans projected for Phases II and III are conceptual,
only. As presented, the plans and stability analysis for Phase I satisfy
the requirements of our regulations. The plan also satisfies stipulation
No. lb of Permit No. C-038-81.
423 Centennial F3uildinq, 1313 Sherman Street Denver. ColDrario 80203 Tat [phone]