REP24869

• Permit No: C1981033
• IBM Index Class Name: Report
• Doc Date: 10/8/1985
• Doc Name: SUBSIDENCE FINDING BEAR COAL CO AREA EXPANSION PR APPLICATION PN C-81-033
• From: MLRD
• To: RANDY PRICE
• Permit Index Doc Type: SUBSIDENCE REPORT
• Media Type: D
• Archive: No

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Ricnar0 D. Lamm
Governor
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DEPARTMENT OF NATURAL RESOURCES
Davao H. Getches. Esecutnre Director
MINED LAND RECLAMATION DI\
DAVID C. SNELTDN, Director
October 8, 1985
Randy Price
Jim Pendleton ~'~ ~ ~ ~`~-
Subsidence FiTtdin Bear Coal Company's Area Expansion
Permitf~Re ion Application (Permit No. C-81-033)
Pursuant to your request, I have reviewed Bear Coal Company's response to our
earlier adequacy comments regarding their requested permit area expansion. I
have drafted the attached findings for your use in preparing your amended
permit findings document. Please contact me if you require any further
assistance.
Bear Coal Company is requesting a permit revision approval to add acreage
subleased from the adjoining Mt. Gunnison No. 1 Mine. They have sublet the
rights to mine coal in all seams on the property, but propose a revision plan
for the "C" seam only.
The amended permit revision application contains a clarified discussion of the
effects of mining the "C" Seam upon the upper "E" and "F" Seams'
recoverability. The applicant explains that the mining of the "C" Seam will
increase the roof control costs and decrease the recoverability of the coal in
both upper seams, but will not prevent mining of those seams. I believe the
amended discussion to be acceptable.
The applicant has responded to my concerns regarding the potential for
landslide occurrence or rejuvenation of the mapped landslide deposits
overlying the proposed mine workings. Bear Coal Company, in response to
Stipulation No. 15, placed upon approval of the Bear No. 3 Mine permit,
proposed to install two additional subsidence movement monuments on the mapped
landslide deposit overlying the proposed workings. Through an apparent
misunderstanding of their monitoring program requirements, the company failed
to install the required subsidence monuments on the mapped landslide deposit
prior to development and retreat mining of the underlying workings.
In order to determine the actual magnitude of subsidence within the mapped
landslide deposit, Bear Coal Company has committed to the installation of two
additional subsidence monuments within portions of the mapped landslide body
which have not yet been undermined. These monuments are projected to be mined
beneath during 1986. If the resulting subsidence data suggests potential
423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. [phone]
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