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<br />(Page 3) <br />MINE ID # OR PROSPECTING ID # M-77-493 <br />INSPECTION DATE 9-28-93 INSPECTOR'S INITIALS ACS <br />The Division believes that it is incumbent upon the operator to employ beet available <br />technology to control wind erosion of the tailings (at this time it appears that Coherex is- <br />th0 best available technology), and that erosion control measures be diligently applied. <br />Obviously, wind erosion will be an on-goinginspection item for this site. <br />7. Robinson Lake is a process water storage reservoir. The lake accepts decant water from <br />the Ten Mile Tunnel as well as from the Dam #1 under drains and the 26 in. mill water line. <br />The embankment that forms Robinson Lake is inspected for stability and safety by the Office <br />of the State Engineer. <br />8. The Moly-Oxide Pond, now referred to as the Eagle Park Reservoir, was installed ae a <br />tailing impoundment in the headwaters of the Eagle River drainage basin. Unlike the other <br />tailing dams at the Climax site, this pond was constructed using an earth fill dam. At the <br />time of this inspection, the tailings in the pond were being re-slurried using high pressure <br />spray. The re-slurried tailings will then be pumped through a temporary line that has been <br />constructed to the Ten Mile Tailing Pond. Once the tailing is cleared out of the Moly-Oxide <br />Pond, it will be reclaimed as a fresh water pond (hence the new name). This operation, and <br />the fundamental change in the reclamation of the pond must be addressed in a technical <br />revision (TR) to the Climax Mine Reclamation permit. The revision should address operational <br />and reclamation aspects of the project, including safeguards in the event of a break in the <br />tailings line or high pressure water line, as well as water rights aspects of converting the <br />pond to fresh water storage, modifications to the dam that will be necessary under the plan, <br />and monitoring that will ensure that clean-out of the pond was successful. The operator <br />should be aware that since Climax will become a designated mining operation under the <br />provisions of the revised Mined Land Reclamation Act, items that in the past were perhaps <br />considered operational in nature, or were simply dealt with in the annual reports to the <br />Division, could now require revisions to the permit (either technical revisions or <br />amendments). The of £ect of changes to the Mined Land Reclamation act will become more clear <br />as new Rules are promulgated by the Board; in the mean time, the operator should contact the <br />Division any time there is a question as to whether or not a revision is necessary, or as to <br />what form a revision should take. <br />9. The seep water collection and pump-back system below the Moly-Oxide Pond was examined and <br />found to be effective in preventing any surface discharges of seep water. <br />10. The entire length of the west intercepter canal was driven and found to be functioning <br />as intended. The operator has routed contaminated discharge from a number of pre-law <br />workings past the canal and into the tailings areas were it is treated and released. <br />11. The outlet pipe at the Clinton cut-off was inspected. The operator treats mine and <br />process waters with lime at the Climax Camp, then the East Tailing Delivery Line is used to <br />transfer treated water to the Mayflower Pond via the Clinton cut-off. Sludge settles out in <br />the Mayflower Pond, and water is acidified to bring it to an acceptable pH for discharge at <br />the Mayflower Treatment Facility. <br />I & E Contact Address <br />cc: Carl Mount, DMG <br />NAME Frank Zancanella <br />OPERATOR Climax Molybdenum Company <br />STREET Climax Mine <br />CITY/STATE/ZIP Climax, CO 80429 <br />