_GENERAL DOCUMENTS - C1981017 ‎(279)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎
• Media Type: D
• Archive: No

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Finally, the company has installed an extensive system of subsidence monitoring
monuments with which it proposes to verify its projections of subsidence
occurrence. "Specifically, the program is designed to provide the following
data:
- Maximum subsidence resulting from mining
- Horizontal movement of the ground surface resulting from mining
- Subsidence development profiles
- Subsidence profiles resulting from mining
- Strain profiles resulting from mining
- Determination of the angle of draw
- The effects of depth and mining geometry on subsidence."
(Page IV-E-33)
The Division concurs with this opinion and with the company's observation
that: "The proposed monitoring program will result in the development of
site-specific subsidence projection models for the Coal Basin area." (Page IV-E-34)
The applicant request permission to monitor the subsidence monument network
three times each summer. Quarterly monitoring, as required normally by Rule
2.05.6(6) (c) , is precluded in Coal Basin by rugged terrain, deep snowpack
and extremely harsh winter weather conditions. The Division, based upon its
inspection experience within Coal Basin, agrees with the company's request
for variance in this regard.
The subsidence aspects of Mid-Continent Resources' application for the Coal
Basin mines are acceptable to the Division with one exception. Therefore,
the Division finds that the following stipulation is necessary for a finding
of compliance with the requirements of Rules 2.05.6(6) and 4.20.
Stipulation:
THE DIVISION DIRECTS MID-CONTINENT RESOURCES, INC. , TO AMEND ITS MINE
PLAN TO INCREASE THE BARRIER PILLARS BOUNDING THE PERMIT AREA. THE
EXTRACTION OF COAL SHALL BE LIMITED TO THOSE AREAS DEFINED BY THE
PROJECTION OF THE LEASE PERIMETERS TO THE DEPTH OF THE COAL SEAM
BEING EXTRACTED, ALONG AN ANGLE OF DRAW OF 20.50 FROM VERTICAL. THIS
LIMITATION SHALL REMAIN IN EFFECT UNTIL THE COMPANY HAS VERIFIED,
TO THE DIVISION'S SATISFACTION, THAT THE ACTUAL SITE-SPECIFIC ANGLE
OF DRAW VARIES FROM 20.50, THROUGH IMPLEMENTATION OF THE PROPOSED
SUBSIDENCE MONITORING PROGRAM.
XXIV. Special Categories (2.06, 4.22, 4.23, 4.26, 4.27, 4.28, 4.29)
(A PORTION)
Steep Slope Mining
In response to comments contained within the Division's Preliminary Adequacy
Review, Mid-Continent Resources, Inc. , submitted a request for variance from
approximate original contour requirements based upon steep slope mining
conditions, in accordance with the requirements of Rule 2.06.5. The majority
of the surface facility disturbances for roads and mine portal benches exists
is areas of original slope greater than 200. The applicant has requested that
these areas be returned to various post-mining topographic configurations, a
portion of which differ from approximate original contour. This request is