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-4 fl 111IIIIJI1III III <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparrmeni of Natural Resources <br />1313 Sherman SI , Room 213 <br />Denver. Colorado 80203 <br />Phone. 1301/ 866.3567 <br />FAX 13031832.0106 <br />Date: 5/9/QI 4:26:50 PM <br />Specialist: Allen Sorenson Signed: <br />Type of interaction: Meeting ` Ph��e Other <br />cc; Erich Bower, via facsimile <br />Carl Mount, DMG <br />MEMO TO FILE <br />Subject/Operator /Operation/File No. Various Matters. Henderson Mill. <br />Climax Molybdenum Company, Permit No. M- 1977 -342 <br />Person(s) contacted and affiliation: Erich Bower, Environmental Coordinator,_Hendersoll Mill <br />303/569 -3221 ext. 2214 <br />Summary and Resolution of interaction: Telephone discussion with Erich Bower on the followinl <br />matters: <br />I. Henderson is compiling a technical revision for submittal to install a ground water interception well lick <br />below the tailing impoundment. This type of facility is considered a "permit condition protective 01 <br />ground water" under Rule 3.1.7, and does not require that points of compliance and num =ric protectior <br />levels be addressed in the TR application. <br />2. The crusher at the mill site is under demolition. Ore residue, or dead bed. accumulated in the crusher pit <br />is compacted and cemented such that it cannot be excavated without blasting. The Operator needs to know <br />what the standard for dead bed removal will be. The dead bed is a potential source for acid rock drainage, <br />but since the crusher pit will be backfilted and capped, is lined with a concrete foundation. and is located <br />out of drainage ways and above the water table, de minimus amounts of dead bed remaining in the pit will <br />not cause ARD. The standard for removing the material is to apply the best reasonable effort using <br />excavators and possibly some degree of hand mucking, but the pit does nor need to rinsed with high <br />pressure water and vacummed. The Operator was notified that the Division must inspect the crusher pit <br />prior to backfilling. <br />3. The 3 -Dam se0,0wgtCr project is being completed. The old 3 -Dam pump station has remained operr►tional <br />as a backup system over the past winter. The Division, through the phone conversation and by this memo, <br />provided the go -ahead to remove the 3 -Dam pump station concurrently with finalization ot'the seepwater <br />project. <br />C:twrrtdowslpersunalthenJerun mu ksnous <br />DrvlsloN o <br />MINERAL: <br />& <br />G ?0L015 <br />' REZLAMAT A <br />1 11111ING , SAF Y <br />BO QvM� <br />Cover co <br />Coot t Michel k.) <br />Emma •r D,rrcra <br />Mrrha B. tong <br />Dwnir , D,r cIa <br />