2011-03-15_REVISION - M1981185

• Permit No: M1981185
• IBM Index Class Name: REVISION
• Doc Date: 3/15/2011
• Doc Name: Preliminary addequacy issues ‎(CN-01)‎
• From: DRMS
• To: R Squared Incorporated
• Type & Sequence: CN1
• Email Name: WHE
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Rewumes
1313 Shaman St., Room 215
Denver, Colo $0203 C O L D RA D O

Phone: [phone]Vts10K of
RECLAMATION
FAX: [phone] MINING
"YETY
sul Bluer, Jr.
Cmwnor
Harris 0. shemwa
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DATE: August 2, 2009 R `" ca
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Natural AmurCS Uabe
TO: Wally Erickson
FROM: Allen Sorenson
RE: Second Review of Access Road Construction, Wildcat Mining Corporation,
Idaho Mill, Amendment AM-01, Fite No. M-2006-069
The Division of Reclamation, Mining, and Safety (DRMS) engineering staff has reviewed the information on
the new access road contained in the Idaho Mill permit application file and inspected the road on May 15,
2009. DRMS has further reviewed the "As-Build Report' for the road prepared by Sakura Engineering and
dated July 10, 2009 and met with Wildcat Mining and their engineering consultants by telephone on June 23,
2009. Mike Clements, Wildcat Mining, Paul Martin, Sakura Engineering, and Kim Preston, Terracon
participated in the telephone meeting. A number of issues remain to be addressed before the road can be
included as an approved component of the proposed mining and reclamation plans.
The "As-Build Report" states that since December 2006 Sakura Engineering has provided Wildcat Mining
Drainage and Terrain Management Plan, Storm Water Plan, Stability Report for the Access Road and Final
Mitigation for the Access Road. All of these plans and reports could prove helpful in the DRMS evaluation
of the road and must be provided to DRMS.
The "As-Build Report" contains a proposal to vegetate slopes in the fail of 2009 "with a seed impregnated
aspen shavings Propex Landlok 450." The DRMS is familiar with the Pmpex Landlok 450 product, but the
reference to "seed impregnated aspen shavings" must be explained. From the Propex line-of turf
reinforcement mats, the Landlok 300 product would be preferable for the Idaho Mill road site because it is
superior to Landlok 450 in a number of ways, but primarily because of its small mesh size, which will
prevent wildlife entanglement in what is asensitive habitat area. The "As-Build Report" states that the turf
reinforcement mats "would be laid on the slope and staked into the earth as per manufacture's [sic]
recommendations." Propex has published an installation guideline for turf reinforcement mats, a copy of
which is enclosed with this memo. The guideline recommends anchoring the mats into trenches at slope
crests and toes, in addition to anchoring with stakes, staples, pins, etc. If DRMS approves the use of turf
reinforcement mats, it will be with the requirement that manufacturer installation guidelines be scrupulously
adhered to. To gain approval, Wildcat must provided a plan showing where the turf reinforcement mats will
be applied, and describing surface preparation and seeding that will precede application.
The DRMS road review memo dated June 5, 2009 states that the road is in cut from approximately station
1+50 to 2+00. The cut in this stretch forms a slot through which the road passes. The June 5, 2009 memo
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