PERMFILE134947

• Permit No: M2000087
• IBM Index Class Name: Permit File
• Doc Date: 9/20/2000
• Doc Name: MILLIKEN SITE 2ND ADEQUACY REVIEW FN M-2000-087
• From: DMG
• To: ROCKY MOUNTAIN CONSULTANTS INC
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
September 20, 2000
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DIVISION O F
MINERALS
GEOLOGY;
RECLAMATION
MINING•SAFETY
Bill Owens
Governor
Danna Ortiz
Greg E. Walther
Rocky Mountain Consultants, Inc. Evecutwe Direcor
825 Delawaze Ave., Suite 500 Michael B. Long
Division Director
Longmont, CO 80501
RE :Milliken Site - 2nd Adequacy Review, File No. M-2000-087
Deaz Ms. Ortiz:
r
The Division has reviewed your September 14, 2000 adequacy response for the above mentioned
Regulaz 112 permit application. Listed below are final adequacy review comments. The
comments aze listed in the same order as the same order as the Division's previous August 18,
2000 adequacy letter. Since the decision date for the application is September 28, 2000, the
Division would appreciate a response on or before September 26, 2000.
EXHIBIT D -MINING PLAN
2. The operator intends to be bonded for a maximum disturbance at any one time of 66 acres.
This is anticipated to occur during Phase 3 of the mining plan. Based on the acreages listed in
Exhibit L- Reclamation Cost table, it appeazs that there will be a disturbance of 60 acres. Please
clarify the maximum disturbance at any one time that the operator wishes to be bonded for.
4. The applicant states the following: "The operator will verify the average width and depths of
the slurry wall to be installed prior to mineral extraction. The sand and gravel extends to depths
of an average of 45 feet. The stability analysis assumed the average width of the slurry wall is
3.8 feet." Based on these projections, the Division requests that the operator incorporate the
following committments to the mining plan: 1) prior to mineral extraction, the operator will
verify and submit to the Division the average width and depth of the slurry wall to be installed,
and 2) if the slurry wall average depth will be greater than 48 feet (45' deposit + 3' keyed into
bedrock) and/or the slurry wall average width will be less than 3.8 feet, the operator will submit a
revised reclamation cost and/or stability analysis as deemed necessary by the Division.
8. The applicant has provided a representative cross sectional design of the slurry wall
construction, design standazds, and a narrative of the construction methods to be used to
construct the slurry wall. In addition, the Division requests that the operator submit within 60