INSPEC17707 - Laserfiche WebLink

Home Browse Search

MINE ID # OR PROSPECTING ID #: M-1aRn-~aa INSPECTION DATE: INSPECTOR'S INITIALS: ~- The Division conducted a monitoring and construction progress inspection of the site on 4-18-02. Terry MANDZIAC, Phil Barnes and Mark Tidquist of CC&V were present at the different portions of the inspection. Prior to the inspection, brief discussions regarding the water balance of the leach pad facility were discussed. According to Phil, Golder is still working on the calculations and also suggested that CC8:V might lower the slopes of the Phase IV PSSA, for additional storage. He was informed that, as long as the changes in the slopes from a steeper to a gentler slope is submitted with the appropriate diagrams with the water balance calculation, the Division will not object to the change from what was approved in Amendment #8. A gentler slope is always preferred, in terms of stability. Given the size AND LOCATION OF THE PSSA AREA, ONE WOULD ALAWYS WLCOME, A GENTLER SLOPE. However, when the slope is changed, it also changes the 80% operational elevation for the pond, meaning it will be at a lower elevation than was approved in Amendment #8. We both agreed that would be the case, and will be noted as such, once the final drawing and water balance calculations are submitted, to satisfy DMG'S adequacy letter for approval of TR # 40. Physical inspection of the site began around PHASE IV an area, in anticipation of liner deployment, the interface area along Phase I; the HDPE liner has been exposed. Golder has marked all the liner exposed and damaged during the removal of ore from the area, for repair, prior to extending it to the Phase IV (A) area. No major problem noted. Operator has opted not to place process solution collection pipes in the Phase IV (a) area, to recover the Gold, as was approved in Amendment #8. They feel due to the steep slopes of the pad in this area, the pregnant solution will not require a solution collection pipes and would be able to reach the PSSA AREA THROUGH GARVITY FLOW. Since this is a recovery process, it does not matter to DMG, how CC8cV recovers the Gold. DMG'S concern is the detoxification process. Since that process is a performance Standard, what and how the operator chooses to do recover its Gold is of little Consequence to the Division. Inspected the LOB AND CRUSHER AREAS FOR PAHSE IV. The area was walked. In anticipation of LLDPE deployment, to the north of the LOB, clay finer has been deployed, according to representatives present, Poly Flex, PLANS TO BE ON SITE SOMETIME NEXT WEEK TO DEPLOY THE LINER. The Phase IV, DIVERSION DITCH ALONG THE NORTH AND West Side WAS BEING CUT, NO PROBLEM NOTED. In anticipation of spring Runoff, the operator has also placed a small detention basin North West of the phase III area, where the new and old highway 67 join. No major problem noted. Inspected the Phase IV, PSSA AREA, all the underground workings work in the area is completed (UG494). Continued the inspection to the external pond. It was holding some water. The following readings were recorded from the Low Volume Solution Collection Transducers. # 1 WAS AT 10.8 AND # 2 WAS AT 12.7 (READINGS ARE IN INCHES OF HYDROSTATIC HEAD) Inspected the Phase II PSSA AREA AND RECORDED THE FOLLOWING READINGS FROM THE HIGH AND LOW VOLUME TRANSDUCERS. HIGH VOLUME TRANSDUCER #4 WAS RECORDED AT 17.4, #S WAS AT 24.4 AND #6 WAS AT 29.6 (ALL READINGS ARE IN FEET OF HYDROSTATIC HEAD) THE PIEZOMETER FOR THE SITE WAS RECORDED AT 31.8 FEET. LOW VOLUME TRANSDUCER #1 WAS RECORDE AT .16 AND #2 WAS AT .16 FEET OF HYDROSTATIC HEAD. Inspected the underdrain area. As reported in the previous inspection report, in anticipation of spring Runoff, all the BMPS in the area including the large lower pond have been mucked out. Both the 4-inch and south underdrain were discharging, north underdrain appeared to be still frozen. No major problem noted.