2000-05-02_REVISION - M1988048

• Permit No: M1988048
• IBM Index Class Name: Revision
• Doc Date: 5/2/2000
• Doc Name: Appl. for an Amendment
• From: Andesite Rock Company
• To: DMG
• Type & Sequence: AM1
• Media Type: D
• Archive: No

CORPORATE OFFICE
300 S.PHILLIPS AVE.•SUITE 200
P.O.BOX 5829
• SIOUX FALLS,SD 57117-5829
' PHONE [phone]
FAX [phone]
_j PROCK COMPANY MOUNTAIN DIVISION
7321 E.88TH AVENUE•SUITE 200
HENDERSON,COLORADO 80640
303-287-4655
FAX [phone]
May 2, 2000
Gregg Squire
Division of Minerals and Geology
Department of Natural Resources
1313 Sherman Street, Room 215
Denver, CO 80203
RE: Application for an Amendment to a Regular 112 Permit,#M-88-048, Carr Gravel Resource
Dear Gregg:
Thank you for sending the pre-operational inspection report. As we mentioned when we met at
the site on April 21, 2000, we are revising our reclamation plan for the amendment area.
The original reclamation plan for the amendment area was proposed to be water storage
reservoirs. The revised reclamation plan for the amendment area contains no water storage
reservoirs. The amendment area will be reclaimed in the same manner as the rest of our
currently permitted area -as pastureland. A revised drawing of the section is attached.
Following is a summary of the reclamation method used on the original permitted area:
Stripped topsoil and overburden are immediately replaced in the preceding excavated
portions of the mining operation by scrapers following behind the excavator and haul trucks
of the mining operation. Permanent revegetation of the backfilled areas of the current
permit site occur within the same one or two years following the backfilling and topsoiling,
preceded by a temporary cover-crop to enhance the organic content of the topsoil and to
preclude erosion, until the permanent grass-seed mixture can become established. This
method of an "over-the-shoulder" reclamation technique has resulted in very successful and
permanent grass stands on the reclaimed mined area of the current permit site.
The same reclamation method will be employed on the amendment area to achieve the final
use after mining; reclamation back to pastureland. We will use the same seed mix as in the
original area. The seed mixes are listed in the amendment application in Exhibit E.
On the revised drawing, you will see that the amendment area will be reclaimed at a height
much closer to its pre-mining elevation than was shown on the original reclamation plan for the
area. The contour lines on the revised drawing are our most reasonable estimate of the final
grade. The final grade is dependent on various factors, including deposit depth and gradation,
thickness of overburden layers, and the marketplace. These factors also contribute to the
amount of granular backfill to be used in the area with reclamation. We have traditionally
replaced approximately four (4) feet of material in the excavation.