1992-02-10_GENERAL DOCUMENTS - C1981017 ‎(2)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Date: 2/10/1992
• Doc Name: Bid Documents ‎(IMP)‎
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

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$ STATE OF COLOFADO
Roy Romer, Governor
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DEPARTMENT OF NATURAL RESOURCES
MINED LAND RECLAMATION DIVISION
FRED R. BANTA, Director
DATE: January 25, 1988
TO: Candy Thompson
FROM: Jim Pendleton
RE: Mid Continent Co asin Mines Permit Renewal - Subsidence Aspects
(Permit No: C-81 -017)
I have completed a review of the permit renewal excerpts which you forwarded
me from Mid Continent Resources ' permit renewal application for their Coal
Basin Mines. In specific, Ilreviewed the sections of that application
addressing the subsidence control aspects of the permit.
The applicant was originally required to monitor subsidence occurrence at the
mine in order to verify projections contained within the original permit
application. After four yea s of monitoring the applicant applied for
cessation of the monitoring requirements. The Division approved cessation of
monitoring above the room & pillar and single-pass longwall areas of the mine
in the spring of 1986, with veral stipulated conditions. Among these
conditions was the completio of a final survey at the end of the current
permit period. This survey should be completed this coming summer, when field
conditions allow. I suggest that you remind the applicant of this stipulation
placed upon approval of thei cessation of subsidence monitoring.
The applicant was also requi d, among other things, to institute a subsidence
monitoring program above any double-pass longwall extraction which might occur
in the future, in order to verify the character of suibsidence occurrence
above this thicker extraction situation. If the permit term being approved in
this renewal includes a proje tion of any double-pass longwall extraction, we
should require that a program for subsdience monitoring be included within the
renewal application. At a mi imum, Mid Continent should include an
unambiguous commitment to provide an acceptable monitoring program plan, at
least six months prior to the commencement of any double-pass extraction. It
will be important to install the monuments and perform the initial surveys
during the summer season before the activity, remembering that the monitoring
season is seriously constrain d by snowpack conditions on Huntsman Ridge.
cc: Bob Liddle
423 Centennial Building, 1313 Sher an Street DInver, Colorado 80203-2273 Tel. [phone]
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