GENERAL53438

• Permit No: C1981013
• IBM Index Class Name: General Documents
• Doc Name: PAGES FROM ORIGINAL PERMIT RENEWAL SUBMITTED
• Permit Index Doc Type: CITIZEN COMPLAINTS
• Media Type: D
• Archive: No

These stations will be surveyed quarterly while longwall
mining is occurring in the adjacent panel.
Additional stations will be established over the NW#2
longwall panel to monitor subsidence and further define the
angle of draw. The proposed locations of these stations are
shown on Map 17.
Survey stations will also be established at all structures
located within the projected longwall subsidence trough to
adequately determine the effects of subsidence. No
structures are located over areas of projected longwall
mining at the Golden Eagle Mine during the next permit term.
Monitoring and control plans will be submitted for any new
structures on a case by case basis. These plans will be
submitted to the Office of Mined Land Reclamation at least
six months prior to the projected zone of subsidence (the
subsidence trough) advancing to within 100 feet of the
structure.
Results of subsidence monitoring will be submitted semi-
annually within 45 days following the end of the second and
fourth quarters. Results of previous subsidence surveys can
be found in Exhibit 24 - Subsidence Monitoring Data and
Control Plans. Future submittals will be incorporated into
this exhibit.
Subsidence Coatrol Play
Subsidence Control is achieved by adopting a combination of
limited extraction to prevent subsidence and Longwall Mining
as a means of controlled subsidence for areas where
renewable resources may be impacted. Calculations have been
completed to determine pillar strength in relation to seam
thickness, mining height, roof material, depth of cover, and
mine configuration to yield minimum pillar dimensions and
maximum allowable extraction ratios to avoid subsidence.
Likewise, a monitoring plan has been implemented to
determine the effects of controlled subsidence associated
with longwall mining.
2.05-51
(Revised 1-17-94)
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