PERMFILE72813

• Permit No: M2004067
• IBM Index Class Name: Permit File
• Doc Date: 3/25/2005
• Doc Name: 1st A.R. - Modifications to Application
• From: Banks and Gesso LLC
• To: DMG
• Media Type: D
• Archive: No

MMRR Quarry, M-2004-067
Response to Jan. 21 Adequacy Review
March 23, 2005
Page 4
6.4.4. Exhibit D.
Maximum Disturbance. Based on the reconfigured entry road and a
rechecked area calculation inclusive of all disturbed areas (including the
entry road, internal haul road, processing area, waste rock pile, quarry,
and other incidental disturbances), the total area of disturbance in the
revised 10-year mine plan under review is 39.95 acres. This acreage
represents the areal extent of mining at the MMRR Quarry and
incorporates a slightly wider bench design on the east side of the main
quarry area and to the southwest of the processing area.
The "vertical area" of highwall faces would add area to this calculation, but
the mining plan calls for establishment of stable, reclaimed highwalls as a
direct result of the mining process. The area of 39.95 acres accurately
represents the total area of disturbance requiring subsequent reclamation
measures.
Concurrent reclamation of the waste rock pile and benches is anticipated
during active mining, making maximum disturbance at any one time
something less than the total 39.95 acres. However, at this time it is
unknown how quickly reclamation of the waste rock pile, benches, or other
areas of the site will proceed and qualify for release from reclamation
bonding. To allow for an appropriate degree of flexibility in the mining and
concurrent reclamation process, the applicant proposes to use a
maximum disturbed area of 39.95 acres for bonding purposes.
Overburden. The submitted mining plan calls for rock generated in the cut
for an access road to be dedicated, to the extent possible, to raise the
grade within the footprint of the processing area. Rock from canyon walls
at the perimeter of the processing area would also contribute to the
creation of a pad underneath the area. However, a net cut of 90,000 cubic
yards cannot be placed in the processing area footprint without raising the
incline of the entry road or having similar undesirable consequences. The
waste rock pile is intended to provide storage for this 90,000 CY, and
subsequently for overburden from the initial stages of production mining at
the site.
Once the pit floor is sufficiently large, additional mining below the pit floor
level, outside the processing area, can be accommodated along with
processing in its dedicated footprint. Mining below the finished pit floor will
occur in cells not closer than 25 feet to the base of highwalls and not
larger than 5 acres. This practice will allow for more efficient recovery of
rock within the mining limits while providing a significant volume of
permanent storage for unusable waste rock and/or fines. The depth of pit
floor cells will be balanced with the amount of overburden generated, such