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,. , SUBSIDENCE MONITORING PLAN E-SEAM LONGWALL PANELS 1 EAST AND 2 EAST This Subsidence Monitoring Plan (Plan) outlines: the monitoring program to be followed for the 1 East and 2 East langwall panels in the E-seam. This Plan is designed to verify the subsidence predictions for dray angle and maximum subsidence contained the Permit for the No. 6 Mine longwall panels. 1.0 Monitoring Points This Plan utilizes both existing and new monitoring points. Not all of the existing monitoring points will be monitored under this Plan_ Figure 1 illustrates the locations of existing subsidence monitoring points with respect to No. 5 Mine workings (F-seam) and Na. 6 Mine workings (E-seam). Figure 1 also shows generalized overburden thickness contours for No. 6 Mine. A projected zero-subsidence contour was used to determine which monuments wpuld be monitored under this Plan for mining of 1 East and 2 East longwall panels. This projected zero-subsidence contour is shown on Figure 1. It is based on the anticipated 19 degree draw angle plus a 6 degree buffer factor. Cyprus Empire will c, monitor parts of existing lines "A", "8", "c", "D", "S", and "T". `~ Specific points to be monitored are listed i.n Section 2.0, ~~ ~-c.'' ` Monitoring Schedule, of this Plan. , 1,F1 ~ New monuments will be constructed to extend monitoring line "B". -;,"`: ~ These new monuments will be constructed on 5D-ft centers along the . ~ `~: ,,. .orientations shown on Figure i. Monument construction will conform ~, ~ 1' to the requirements and specifications contained in the Permit. + ~' ~ c.; ~ ~U i ~ ~, 2.0 Monitoring_$chedule ~~'`~ It is the intent of Cyprus Empire to provide monitoring under this Plan of potentially a#Eected monuments on a quarterly basis. However, this monitoring schedule will be modified as necessary to accomodate weather conditions. Monitoring oz any given point will continue until. two successive surveys indicate subsidence has ceased. Monitoring of a point satisfying this criteria will then be discantinuecl. 2.1 Quarterly monitoring, 1 East Lonywall (a) Lines "S" and "T", monuments S1 through 517 and T1 and T2. Monitoring to commence no later than when the longwall face is 800 ft from monument T2. (b) Line ^C", monuments C1 through C17. Monitoring to commence no later than when the lottgwall face is 630 ft from monument CLJ.