PERMFILE117796

• Permit No: M2000113
• IBM Index Class Name: Permit File
• Doc Date: 11/1/2000
• Doc Name: MAMM CREEK SAND & GRAVEL PIT HYDROLOGIC ADEQUACY REVIEW COMMENTS FN M-2000-113
• From: DMG
• To: GREGG SQUIRE
• Section_Exhibit Name: EXHIBIT D MINING PLAN
• Media Type: D
• Archive: No

OF
Ili IIII COLORADO
DIVISION OF MINERALS AND GEOLOGY II1111111111
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Department or Natural Resources
1 313 Sherman SL. Room 21 S
DIVISION O F
Denver, Colorado 80203
Phone: [phone] M t N E R A L 5
FAX: [phone]+
GEOLOGY

Dale: November 1,2000 RECLAMATION i
MINING•SAF ETY
To : Gregg S
uire
Cazl Mount B~II O..ens
q
, Go~ernur
Greg E Walther
From :Tom Schreiner ~
s Eeecun°e Otreclor
M14<hael B. long
Division Dneclor
RE : Mamm Creek Sand & Gravel Pit -Hydrologic Adequacy Review Comments
File No. M-2000-113
I have reviewed the September 8, 2000 Regular 112 Application for the "Mamm Creek Sand &
Gravel Pit" located in Ga~eld County, l.8 miles east of Rifle along the Colorado River. The
applicant has requested a permit for 308.36 acres, most of which appear to occur within the
boundaries of [he Colorado River channel. Portions of the affected land, such as the Renewable
Resource Area, occur within the active channel of the river. I recommend the following
adequacy concerns be addressed to the satisfaction of the Division prior to a recommendation of
approval.
RULE 6.4.4 EXHIBIT D - Minin¢ Plan
1. As required by Rule 6.4.4(a), please clarify the method of mining to be employed in each stage
of the operation as related to any surface disturbance on affected lands, ie: wet mining or dry
mining with dewatering and offsite discharge.
2. As required by Rule 6.4.4(e)(i), please provide an estimate of the periods of time which will be
required for the various stages or phases of the operation. (Please be as specific as possible in
providing the seasons or dates of the year when mining will occur for each of the various phases
to be mined).
3. The applicant proposes a mine plan in which pit slopes will be excavated at 0.40H:1 V (near
vertical). Please explain how the desired 3:1 and Z:1 reclaimed slopes will be created underwater
in the absence of backfilling when pit slopes are expected to be up to 25-30 feet in height. (It
appears that the pits will be allowed to fill in with water prior to backfilling to reclamation
contours. For example, the applicant states "when the West Property Line to Horse Fence Area
is mined out, the pit is expected to fill with water."). The Division requests that the applicant
reevaluate the slopes to be created during mining and the feasibility of regrading such slopes to
the desired reclamation contours. The Division recommends the applicant consider maintaining