Laserfiche WebLink
INSPECTION REPORT <br />Site: National King Coal Mine, Hesperus, Colorado <br />Inspected By: Don R. May, P.E., Project Engineer <br />Inspection Date: Quarterly Inspection, November, 2005 <br />Note: no photos due to camera malfunction <br />Ponds: The inlets, outlets and embankments of both ponds were inspected and appear <br />in good condition. The ponds have been recently cleaned and the volume significantly <br />increased. The staff gage used to measure pond depth in the west pond is broken and <br />laying on the embankment. This should be replaced. <br />Drainaoe Ditches: The drainage channels, on the north and south sides of the waste <br />rock pile, appear in good general condition. It appears that a portion of the rock lined <br />channel o~n the south side has been rebuilt increasing the size. Care should be taken to <br />maintain l:he stretch of clean water ditch between the southwest comer of the waste pile <br />and the rcrine office. The upper and lower yards are all in good shape The culvert <br />entrance located on the major drainage that enters at the south side of the mine site <br />near the mine entrance should be periodically cleaned. Recent work behind the day <br />sleeper has improved drainage from the adjacent hiAside. Except where noted, all <br />drainage features have been constructed and are operating as stated in the drainage <br />plan submitted to the Division of Minerals and Geology. <br />Coal Waste Pile: As mentioned in previous inspection reports, over-steepening of the <br />waste piic~ face at the toe of the slope still exists. Several small erosion rills are <br />beginning to form on the face, originating at the steep tce. At this time there are no <br />visible signs of structural instability on the waste pile but a fix for this problems should <br />be pursur~d. <br />The top of the waste pile has been reconstructed. It is very level with a good cross- <br />slope. The-ditch'bli the south side is more like a swale thah a'de~ined ditch but it <br />appears l:o have a reasonable longitudinal slope and there are signs of flow moving <br />through il;. The clear water ditch on the north side is in good shape. The top of the waste <br />pile is in very good shape and care should be taken to maintain this condition. <br />Except for the items mentioned above the fill on the waste pile has been constructed as <br />specified in the design approved by the Division of Minerals and Geology. <br />