REV91719

• Permit No: C1981022
• IBM Index Class Name: Revision
• Doc Date: 3/28/2003
• Doc Name: Letter & Application
• From: Montgomery Watson Harza
• To: DMG
• Type & Sequence: MR67
• Media Type: D
• Archive: No

© MONH
MONTGOMERYWATSON HARZA
March 26, 2003
Mr. Jim R. Burnell
Colorado Division of Minerals & Geology
1313 Sherman Street -Room 215
Denver, Colorado 80203
[phone]
RECEIVED
MAR 2 S 2003
Division of Minerals and Geology
Re: Oxbow Mining, LLC (Permit C-81-022), Minor Revision (MR-67) for Revision of Soil
Material Volumetrics
Dear Mr. Burnell:
In response to your recent inquiries regarding a final survey for the North Elk Creek Soil
Stockpile, Oxbow Mining, LLC (OMLLC) has obtained survey data from the earthwork contractor
and completed updared volumetric calculations for the soil stockpile. OMLLC has updated and
enclosed three copies of the following soils volumetric information from the permit document to
reflect this new information, and is requesting CDMG approval of a Minor Revision (MR-67) to
incorporate the updated soils volumetric information in the permit.
Page 2.05-24 (Mine Facilities discussion under Operations Plan -Permit Area)
Exhibit 2.05-E5, Reclamation Details, Soil Recovery and Replacement Plan
As noted in the exhibit discussions, the North Elk Creek Soil Stockpile contains all soil from the
previous East Yard and Elk Creek soil stockpiles, as well as all soil recovered from the West Valley
Fill, West Valley Haul Road, Pond C, Pond CLight-Use Road, and Elk Creek Mine Surface
Facilities (includes the recent rock dust tank disturbance). With the recent updates, Table 2.05-ES-
Tl, Soil Recovery and Replacement Summary, identifies final soil salvage volumes and the amount
of soil available for future reclamation, consistent with the requirements of Stipulation No. 25. It
should be noted that, because of practical operational considerations (operational load counts are
not typically very accurate due to varying fill Eactors, etc.), soil salvage volumes were determined
based on soil stockpIle surveys. Given this considexadon, information on soil salvage volumes is
available on a "project" basis (i.e., West Valley Fill and Haul Road) but not on an individual area
basis (i.e.,: West Valley Fill, West Valley Haul Road, Pond C, Pond CLight-Use Road). Ic is our
understanding that the information provided by this Minor Revision application should effett
compliance with Stipulation No. 25, allowing elimination of the outstanding stipulation.
In the course of reviewing and editing potentiall}~ applicable permit sections, we noted a
discrepancy in the Soil Recovery and Replacement Plan relative to soil replacement practices for
the West Valley Fill. During the West Valley Fill and Haul Road construction project,
approximately 10,400 cubic yards of soil material were recovered and placed in the Elk Creek Soil
Stockpile. This material came primarily from the Pond C area and the portion of the West Valley
Haul Road within the Elk Creek drainage. Given the source of these materials and timing
considerations relative to progressive construction of the West Valley Fill, OMLLC did not intend
to replace these soil materials on the completed West Valley Fill, as indicated by text references in
the approved Soil Recovery and Replacement Plan.
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