1987-12-01_PERMIT FILE - C1981017 ‎(284)‎

• Permit No: C1981017
• IBM Index Class Name: PERMIT FILE
• Doc Date: 12/1/1987
• Doc Name: Subsidence Study By Dr. Bruce Collins
• Section_Exhibit Name: Chapter IV Appendix IV-F-4
• Media Type: D
• Archive: No

Location (mine coordinate system) : 16975. 30N, 520.71E
• Original Elevation (ft) : 11 ,842 .40
Total Movement Since Installation (ft) : none detected
Estimated Cbal Removed Within Subsidence Zone: none
Subsidence Ratio : --
Location Relative to Mine Workings : about 810 ft NW of head-
gate, lw 301, No. 3 mine; about 1,100 ft NW of lw 204 start-
line, No. 2 mine .
Discussion: not surveyed until 1984 . Stable; outside of long-
wall 204 and 30i subsidence zones. See Figure 2 .
Point No. : TP-3
Type: control
Installed : 1981 , Surveyed: 9/84 , 8/85
Location (mine coordinate system) : 20486 . 96N, 684 . 65E
Original Elevation (ft) : 11 ,446 .29
Total Movement Since Installation (ft) : none detected
Estimated Coal Removed Within Subsidence Zone (ft) : none
Subsidence Ratio: --
Location Relative to Mine Workings : 2 , 000 ft W of 5 North,
No. 5 mine .
Discussion: not surveyed until 1984 . Stable; outside subsid-
ence zone of any active workings. See Figure 2 .
Point No. . TP-4
Type : control
Installed : 1981 Surveyed : 9/84 , 8/85
Location (mine coordinate system) : 17301 .31N, 1630 .96E
Original Elevation (ft) : 11,729 . 53
Total Movement Since Installation (ft) : -0.19
Estimated Coal Removed Within Subsidence Zone (ft) : 8 . 00
Subsidence Ratio : 0. 02
Location Relative to Mine Workings : 340 ft N­of£ lw 301 tail-
gate, 550 ft NW of 4 North, No. 3 mine; 865 ft NW of lw
204 startline, No. 2 mine.
Discussion: not surveyed until 1984 . 4 North No. 3 mine
apparently mined in 1974 and now assumed to be stable.
All movement assumed to be result of longwall 301; mining
stopped in early 1981. Probably outside of longwall 204
subsidence zone. See Figure 3 .
Point No. : TP-5
Type: control Surveyed: 1982 , 83 , 9/84 , 8/85
Location (mine coordinate system) : 11994 .94N, 4905.71E
Original Elevation (ft) : 11 ,598 .83
Total Movement Since Installation (ft) : -0 .91
Estimated Coal Removed Within Subsidence Zone (ft) : 15. 00
Subsidence Ratio: 0. 06
Location Relative to Mine Workings : between 7 South No. 3 mine
and 7 North No. 1 mine (above bleeder connection) ; over 4
North near lw 203 stopline, No. 2 mine.
Discussion: no movement 1981-82 ; however, movement resumed 1982-
i 83 , before longwall 203 approached this area (mid-1984) .