2008-05-15_REVISION - C1981008

• Permit No: C1981008
• IBM Index Class Name: REVISION
• Doc Date: 5/15/2008
• Doc Name: Review Memo
• From: Dan Mathews
• To: Marcia Talvitie
• Type & Sequence: TR57
• Email Name: MLT
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
COLORADO
DIVISION O F
RECLAMATION
MINING
- &-
SAF ETY
DRMS INTERNAL MEMORANDUM Bill Ritter, jr.
Governor
Harris D. Sherman
Executive Director
TO: Marcia Talvitie Ronald W. Cattany
FROM• Dan Mathews Division Director
• Natural Resource Trustee
DATE: May 15, 2008
RE: New Horizon Mine (Permit No. C-81-008)
TR-57; Soil Resource Information, Soil Handling, and Prime
Farmland
I have reviewed the referenced revision application, including amended text, tables, and appendices
of Section 2.04.9 (Soils Resource Information) and Section 2.05.4(2)(d) (Topsoil Redistribution). I
also reviewed the amended maps 2.04.9-1 (Soil Baseline Map) and 2.05.4-4 (Postmining Topsoil
Replacement), and the new Map 2.04.9-2 (Topsoil Balance Map as of February 2008). My
comments are itemized below. Please let me know if you have any questions.
Section 2.04.9 (Soil Resource Information text, tables, appendices, and maps)
1. The two maps included in the Section 2.04.9 submittal are not listed in the Table of
Contents. Please revise the Table of Contents to list Maps 2.04.9-1 and 2.04.9-2.
2. In Table 2.04.9-1 (Procedures and Analytical Procedures Utilized for [Premine] Topsoil
Analysis), on page 2.04.9-11, it is indicated that physical characteristics of each sampled
profile were described and recorded. This information does not seem to have been included
in the Section 2.04.9 tables or attachments, and needs to be provided to supplement the soil
laboratory data. Please provide this information for inclusion in the application if
available.
3. Soil analytical data from the 1998 study is included in Appendix 2.04.9-7, referenced in
narrative page 2.04.9-12. On Attachment page 2.04.9-7-11 the columns are shifted or
misaligned, such that some of the parameter listings do not fall under the appropriate column
heading, making the data on that page difficult to interpret. Please provide a revised
Attachment page 2.04.9-7-11, with columns correctly aligned beneath appropriate
headings.
4. The suitability levels for coarse fragment content for Prime Farmland Lift B and Single-Lift
Soils in Table 2.04.9-2 will need to be further explained and documented. Typical upper
limit recommendations for root zone coarse fragment content are in the range of 30% to
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Mined Land Reclamation Denver Grand Junctjon Durango Active and Inactive Mines