2011-08-15_REVISION - M1990057 ‎(4)‎

• Permit No: M1990057
• IBM Index Class Name: REVISION
• Doc Date: 8/15/2011
• Doc Name: Adequacy Review
• From: DRMS
• To: Union Milling Company, LLC
• Type & Sequence: TR3
• Email Name: MAC
• Email Name: AJW
• Media Type: D
• Archive: No

DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
August 15, 2011
Michael Elder
Union Milling Company, LLC
P.O. Box 36099
Denver, CO 80236
Dear Mr. Elder,
2. Please depict the location of the temporary clay pad on Exhibit TSF -01.
Office of
Mined Land Reclamation
STATE OF COLORADO
RE: Hopemore Shaft; DRMS File No. M -1990 -057; Technical Revision — 03; Adequacy
Review
3. Please provide the Division with a plan for sub -grade preparation of the tailings storage
facility (TSF) site. The Division requires this information to ensure the sub -grade is
adequately prepared in order to reduce the potential for liner failure.
P
� J
COLORADO
D I V I S I O N O F
RECLAMATION
MINING
— &—
SAFETY
John W. Hickenlooper
Govemor
Mike King
Executive Director
Loretta E. Pineda
Director
The Division of Reclamation, Mining and Safety (Division) has completed its adequacy review
of your Technical Revision to the above referenced permit. The Technical Revision was received
and called complete for review on July 12, 2011. The decision date for this Technical Revision is
August 15, 2011. Please be advised that if you are unable to satisfactorily address any
concerns identified in this review before the decision date, it will be your responsibility to
request an extension of the review period. If there are outstanding issues that have not
been adequately addressed prior to the end of the review period, and no extension has been
requested, the Division will deny this Technical Revision.
1. The Applicant has stated a lower access road will be constructed on the south side of the mill.
A 2010 aerial image of the site shows that there is a road located south of the mill. Please
clarify if a new road will be constructed or if the existing road will be upgraded. In addition,
describe the how the road will be constructed or how the existing road will be improved. The
description should include dimensions of the road as well as any associated drainage and
runoff conveyance structures.
4. The Applicant has stated a 6" — 8" clay under liner will be placed on the interior slopes and
impoundment section. The Division requires clay liners to be constructed with a minimum
thickness of 12 ". Please commit to installing the clay under liner at a minimum of thickness
of 12 ".
Office of
Denver • Grand Junction • Durango Active and Inactive Mines