1996-06-25_GENERAL DOCUMENTS - C1980007

• Permit No: C1980007
• IBM Index Class Name: General Documents
• Doc Date: 6/25/1996
• Doc Name: Proposed Decision & Findings of Compliance for RN3
• Permit Index Doc Type: FINDINGS
• Media Type: D
• Archive: No

Seam only mining subsidence, which will evaluate mining in the Jumbo
Mountain Tract.
The effect of mining-induced subsidence on renewable resources, structures,
and geologically unstable areas in the five-year permit term is discussed in a
report entitled, "Subsidence Evaluation for the West Elk Mine" and can be
found in Exhibit 55.
2. The applicant has proposed a subsidence monitoring program, in accordance
with Rule 2.05.6(6)(c), designed to determine the commencement and
magnitude of subsidence movements. Maps included in Exhibit 60 depict the
location of monuments to be installed and structures to be monitored within the
permit and adjacent area. The results of the monitoring program will be
submitted to the Division semiannually. The monitoring program is designed to
extend for a time, beyond cessation of mining in any area, consistent with the
need for verification of the subsidence prediction.
MCC has extended the subsidence monitoring network to include Jumbo
Mountain and the Apache Rocks revision areas. The location of the monuments
is shown on an Addendum to Exhibit 60. In addition, MCC will establish and
survey an aerial photo control point grid, complete aerial photography of the
mine plan area, and then use photogrammetric methods to measure subsidence.
MCC will verify the effectiveness of this methods by continuing the
conventional survey of the existing grid and of the decreed water rights on
Jumbo Mountain to be under mined. If aerial photogrammetry is successful,
MCC will then submit a revision to eliminate surveying by traditional methods.
In addition to providing subsidence survey data, the aerial photos from the fall
photogrammetric survey will be utilized to map the numerous, small landslide
bodies on the north face of Jumbo Mountain. This mapping will provide a
broader, more extensive view from which to associate or assess landslide
activity due to mining.
An evaluation of the F Seam subsidence monitoring program is provided in
Exhibit 60 (Volume 13). The evaluation includes an analysis of the survey data
obtained Lom the F Seam monitoring network to date, correlation with industry
subsidence protection models, and summary of subsidence parameters observed
for the F Seam. Predictions of subsidence from proposed mining in the B Seam
are included and are based on data and evaluations of the F Seam subsidence
and current industry data.
XVI. Concurrent Surface and Underground Mining
1. This section does not apply to the West Elk Mine.
48