REP12281

• Permit No: C1981044
• IBM Index Class Name: Report
• Doc Date: 10/10/1995
• Doc Name: SUBSIDENCE MONITORING REPORT CYPRUS EMPIRE CORP EAGLE MINE 5 JAN-JUN 1995
• Permit Index Doc Type: SUBSIDENCE REPORT
• Media Type: D
• Archive: No

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SUBSIDENCE MONITORING REPORT
CYPRUS EMPIRE CORPORATION, EAGLE MINE N0.5
JANUARY-JUNE 1995
1.0 INTRODUCTION
RECEIVED
OCT 1 p
1995
Division ar ~~,,,,e,d,5 g Geolo9Y
This report summarizes the survey results of subsidence monitoring over E-seam
longwall mining panels at Cyprus Empire Corporation's (CEC) Eagle Mine No. 5. This
report covers the period of January through June 1995.
Monitoring point locations, surface features, overburden thickness contours, and the
monthly mining advance are illustrated on the attached map titled, "E-Seam Longwall
Subsidence Monitors."
2.0 MONITORING SCHEDULE
As per the approved monitoring schedule, subsidence surveys were conducted in March
and June 1995. The surveys included all monitors on lines A, B, C, D, and J and the
three highway stations.
3.0 MINING ADVANCE
Mining of the 3 East longwall panel advanced approximately 1600 feet from January to
June 1995. During the first quarter 1995, mining advanced beneath the Amoco pipeline.
Monthly advance is illustrated on the attached map.
4.0 SUBSIDENCE RESULTS
The results of the monitoring surveys are presented in the attached tables. The
accuracy specification on the monitoring survey is 0.1 ft. Listed below are the highlights
for each line.
Line Maximum Subsidence 1/95-6/95 Total Subsidence to Date
A 0.0 ft. -6.9 ft.
B -0.1 ft. -7.1 ft.
C -0.3 ft. -4.6 ft.
D -0.1 ft. -9.6 ft.
J -0.2 ft. -11.9 ft.
The highway monitoring stations have not changed in elevation within the accuracy
specifications.
No substantial cracks have appeared. Small cracks, ranging in horizontal spread from
less than an inch up to three inches, have been located and will continue to be visually
monitored.