2005-07-20_REVISION - M1977403HR

• Permit No: M1977403HR
• IBM Index Class Name: Revision
• Doc Date: 7/20/2005
• Doc Name: development characterization
• From: idarado mining company
• To: dmg
• Type & Sequence: TR1
• Media Type: D
• Archive: No

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FROM:
DATE:
SUBJECT:
MEMORANDUM
MFG PROJECT: 1$071$
Bill Lyle, Idarado Mining Company
Jason Andrews and Sherm Worthington
June 16, 2005
Acid-Base Accounting Test Results -Pandora Soil Repository
Geochemical characterization (acid-base accounting) tests were conducted for Idarado Mining Company
(IMC) on materials excavated from the Idarado Legacy "Pandora Area" Development Property and
placed in the repository at the Pandora Mill site in Telluride, Colorado. Materials placed in the repository
consist of native alluviaUcolluvial soils intermixed with mine and mill-related beneficiation materials
(primarily tailing with minor amounts of development or waste rock materials and concrete debris)
generated in 2004 from excavation of underground utilities in the Pandora Area and from demolition of
the foundation ruins at the Gold Run Mill area. As shown on Figure I, the repository is located on the
existing Pandora Mill development rock pile, north of Highway 145 and west of Marshall Creek, adjacent
to the Pandora Mill facility. The repository was approximately 300 feet long, 120 feet wide at the time
the soil samples were collected on September 21, 2004. Based on the approximate area of the repository
(Figure 1) surveyed by Foley Associates, Inc. in February 2005, the repository contained an estimated
40,000 cubic yards of materials.
From June to October 2004, IMC removed underground utilities in the Pandora Area of the Idarado
Legacy Development Property in accordance with the MFG Inc. Management Plan for Miscellaneous
Mill-related Wastes prepared for and approved by San Miguel County. Common with many historic
mining community developments throughout the western United States tailing had typically been used in
the past as bedding materials for many of the underground utility lines in the Pandora area. The utility
removal involved the excavation of overlying and adjacent native soil materials and tailing bedding
materials for the utility lines, and transport of the mixed soiUtailing materials to the repository. The
utility lines were typically buried at depths ranging from approximately six to ten feet below ground
surface, and were typically bedded with tailing materials from approximately six inches beneath to
approximately 12 inches above the lines. As such, the majority of the material volume excavated from
the utility trenches and placed in the repository consisted of native soils overlying or adjacent to the utility
lines. Several of the utility lines consisted of transite (asbestos-cement) pipe. All transite pipe was
managed and handled by licensed and trained asbestos abatement personnel with the pipe being
poly-wrapped, labeled, transported and disposed in accordance with local, state and federal requirements
at an off-site licensed facility. Materials consisting of native soil, remnant mill waste or development
rock, and concrete debris from excavation and demolition of the Gold Run Mill foundation ruins and
roadway surfaces were also placed in the repository.
MFG, Irk.
3F0/ Automation Way, Suite /00
Fnrt Collins, CO A0525
Phone: [phone] Fax: [phone]!
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