_INSPECTION - C1981019 (44) - Laserfiche WebLink

Home Browse Search

Colowyo C-1981-019 27 May 2009 Pg 6/7 Backfilling and Grading (cont.): - The area in the East Pit that was repaired last fall (as a result of the large rainfall in August 2008) appear to remain stable. The two large gullies that were filled in appear to remain stable and do not show any signs of reforming. The contour ditches that were put in place are helping to slow and direct the water that is flowing over the area from the recent heavy rainfall. There does not appear to be any additional rilling of the reclaimed slopes from the recent rain. There is also some water in the sump that is in this area. The Prospect Ditch was dry and appeared to be stable and functioning as designed. The Division would like to remind Colowyo that the area that was regraded just above Prospect Pond at the tie-in to the native area will need to have the topsoil replaced and will need to be reseeded this fall. Topsoil: - The topsoil pile north of the final East Pit that was seeded last fall has good vegetative growth on it this spring. The pile appears to be stable and no erosional problems were noted. - The topsoil just below the Section 28 Pond is well vegetated and appears to be stable. No erosional problems were noted on the pile. General Mine Plan Compliance: - The 101 dragline is on the East Pit highwall where it was performing reclamation. - The 102 dragline was out of sequence and performing regrading operations in the north west corner of the West Pit. - The 103 dragline was removing overburden for the mid-pit area of the E-Seam in the West Pit. - The 114 shovel was not operating on 27 May 2009 but it was operating in a lower drainage area of Taylor Draw in the South Taylor Pit on 28 May 2009. - The 115 excavator was idle at the time of the inspection. - There was a dozer cleaning coal in the South Taylor Pit box-cut area. - The mining at the Colowyo Mine appears to be progressing as discussed and approved in the PAP. Air Resource Protection: - The haul roads in the East Pit, West Pit and South Taylor Pit were all dry at the time of the inspection. There was some dust coming from the roads but the operator was running a water truck. Excess Spoil: - The current active dump area for the South Taylor Pit is the C-C' underdrain area of the East Taylor fill. The overburden is coming from the overburden in the Taylor Draw area of the box-cut. The fill has advanced to almost the crusher bench (which will be relocated). Most of the liffs have reached their maximum height and the remaining lift is approximately 50-feet below its maximum height. The fill appeared to be stable at the time of the inspection. It was not known which section of the East Taylor Fill would be used next, after this area is completed to the extent possible.