Laserfiche WebLink
1 + <br /> <br />2.05.6(6} <br />The mine plan configuration of the B seam workings places bleeder entries <br />for the B-4, 5 and 6 panels under approximately mid-panel on the D-7 panel. <br />This area of multiple seam mining has an increased risk to damage the land <br />surface through increased tensile strains. It is expected that this increased <br />strain will cause surface fractures to form. Since this area of multiple seam <br />mining underlies Sheep Corral Gulch, The Forest Service is concerned that <br />surface fractures may cause interruption of surface flows (when present), <br />damage stock ponds or create large fractures that will need to be mitigated. <br />The Operator will perform on-the-ground visual monitoring for subsidence <br />damage (including fracturing) in Sheep Corral gulch in the area where <br />multiple seam mining will occur. This monitoring will initially be performed <br />within 3 months after the bleeder entries are developed, and on a quarterly <br />basis thereafter during mining of the respective panels, and for six months <br />post mining (monitoring to be done as weather permits). The results of each <br />monitoring event described in the will be sent to the Forest Service and the <br />DMG within one month. <br />The results of the subsidence monitoring programs and the results of the <br />visual inspections for mass movement features will be submitted semi- <br />annually for the reporting periods ending in June and December, within 30 <br />days of the end of the reporting periods. <br />(f)(vi) Map 14 & 146, Mine Plans, present the location of the underground <br />workings. Map 27, Subsidence shows the subsidence survey monument <br />locations and the limited extraction zones for Pond P-1, Hubbard Creek, <br />Freeman Gulch, Dove Gulch, Dove Cave and near the outcrop. The limited <br />extraction zone near the outcrop is shown as the 110' overburden line. <br />Mining in low overburden areas adjacent to the possible fault trace is <br />explained in section (f)(ii)(B) above. <br />(vii) Map 14, Mine Plan, presents the location of the underground workings <br />including the size, configuration, and approximate location of pillars and <br />entries and extraction ratios. Measures taken to prevent of minimize <br />subsidence are present on Maps 14, 14B and Map 27, Subsidence. <br />PR-08 2.05 - 114 - 09/03 <br />H PPROV6D <br />9~as~o3 <br />