PERMFILE114812

• Permit No: C1982057
• IBM Index Class Name: Permit File
• Doc Date: 6/16/2006
• Doc Name: Highwall Mining
• Section_Exhibit Name: Tab 12 Attachment 12-4
• Media Type: D
• Archive: No

condition of the highwall, stability of the
of surface features. For instance, SCC r
sedimentation structure even though surf
shown that wifl not be highwall mined due
Highwall Miner Ground Control Plan.
Rule 4.23.2 12) is being complied with e
workings within 500 feet of the proposed
In the interest of contemporaneous reclam tion for Rule 4.23.213), auger (highwall miner) mining will
be initiated and completed as soon as poss ble after the surface coal has been removed. The highwall
miner operations will be following the dragline stripping operations along the entire length of the final
highwalls as shown on Exhibit 12-3, 12-3a, and 12-36, Operations Plan.
I, condition and thickness of the coal seam, and location
leave a block of unmined coal beneath the Pond 016A •
subsidence is not expected. There are other areas as
coal seam conditions and characteristics presented in the
. since there are no abandoned or active underground
(highwall miner) operations.
For Rules 4.23.2(4) and 4.23.2151, special plugging procedures are not proposed for this set of auger
Ihighwall miner) holes. The holes will be plugged by backfilling operations as a normal part of the
highwall miner and reclamation operation Drainage from these holes will not be a problem as
discussed in the Hydrology Section.
For Rule 4.23.216) Id), subsidence re
buildings, or other surface facilities is
conducted by SCC. There are no stru
of draw of highwall mining. If cracks r.
them. As per accordance with the M'
minimum safety factor of 1.5.
ig from auger Ihighwall miner) mining to any powerlines,
predicted occur based on the engineering design analysis
s on areas overlying, or within a possible subsidence angle
i to highwall mining do occur on the surface SCC will repair
ground control plan, SCC will design pillar strength with a
•
Finally, Rule 4.23.2(71, requires that
with approved backfilling and grading
requirement is included in Tab 19.
2.0 GEOLOGY
Ihighwall miner) mining shall be conducted in accordance
~rements of Rule 4.14. A variance request to the 180-day
Site specific geology within and adjacent tq~ the permit area is presented in Tab 6 of the permit
application package.
Coal seams to be mined: Wadge, age Creek, and Wolf Creek
Wadge Thickness: 7' to 14'
Sage Creek Thickness 3'to 7'
Wolf Creek Thickness: 10' to 6'
Height of highwall: The highwall
depth encompassing the highwall
will vary from 30' to 150'. The maximum overburden
will be approximately 450 feet.
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PR04 I 12-4-2 Revised 04/04