Laserfiche WebLink
5) Maps for this site in DMG files are from 198384. The Division will require new maps <br />reflecting current conditions and proposed impacts along with final reclamation <br />configurations. <br />6) The final reclamation plan calls for 2:1 slopes, debris removal into the adit and an earthen <br />plug at the entrance. Seed mixes are BLM/ DOE approved. Some topsoil does exist and <br />will be protected but it is limited naturally. <br />JD-9 Mine, M-1977.306 <br />The JD-9 MINE is the most complex site of the five. An emergency escape way shaft and vents <br />are located on top of Davis Mesa, while the entrance of the mine is in Bull Canyon below. The <br />emergency escape way shaft is used to dewater the mine and is the location of current and <br />future water treatment ponds. <br />1) Currently, waste rock materials are being gobbed underground. In the future it maybe <br />necessary to bring waste materials to the surface dumps. The existing rock waste piles <br />run along the eastern edge of an existing drainage. The drainage is:the pathway for the <br />treated water-#rom the dewatering operation on the mesa top.-above.: A 36-inch culvert <br />directs the water through the waste piles to minimize contact~between-the waste and <br />water. Observations are that there is some minimal contact above the culvert and the toe <br />of the slope of some waste. This contact appears to be-more a slight over dumping issue <br />rather than water seepage under the pile. Below the pipe, a major storm noted in 2002 <br />impacted this site as well. Some erosion of the channel occurred, but it is no more <br />significant than in non-mining areas.. Cotter will have to review plans to dump waste <br />beyond current limits as it will greatly impact the drainage and increase the possibilities of <br />dewatering efforts contacting the waste. There is plenty of room to establish2:'.1'slopes <br />when rock waste piles are reclaimed. <br />2) Waste rock materials have not been analyzed for geo-chemical properties. Results from <br />a composite sample from the JD-6, JD-8 and JD-9 will be submitted after all issues <br />concerning this review are complete and agreed upon. <br />3) JD-9 dewaters the mine at the top of the mesa using a treatment tank and two settling <br />ponds prior to~release. The Division will request a copy of the permit for the file record <br />and is requesting a copy of the most current testing result from the last 90 days. Staff <br />was on hand to observe the addition of barium chloride to the treatment tank. From the <br />tank, water is discharged into a primary settling pond which discharges into a secondary <br />pond prior to being piped to the canyon edge. Water quality is such that it is close to or <br />meets drinking water standards. The ponds are beginning to show their age. Free board <br />liners on both ponds are showing signs of deterioration from sun and weather. The liners <br />underneath the water appear to be in good shape, but confirmation is difficult due to the <br />amount of sedimentation in the ponds. No signs of leakage are noted. Sedimentation in <br />the primary pond is approximately 2/3 or greater. Vegetation is noted in the materials <br />within the pond liner. Cotter in 1994 amended their permit to include new ponds. Those <br />ponds have been constructed for some time with the exception of placing liners within <br />them. Cotter is monitoring the ponds and will switch over to the new ones when <br />necessary. Sedimentation in the old ponds is to be dug up and shipped to the Canon <br />City mill for final deposition. <br />