GENERAL49732 - Laserfiche WebLink

Home Browse Search

Gold Hill Mill Afligpscv r1.v;.+ nnnoenag Mwv 2 1995 I3 The Mine Safety and Health Administration (MSHAI inspector indicated verbally after the inspection that everything was sflbsfactory et the srk and did no[ issue any citations. The repon was sent to CMLRB and not to the Gold Hill rrtill or COM, lac. A copy of the repon was rcqutsted @om the Divuwn a@er the shortoorrtirtge ware mentioned by the Divteton inspectors The shortcomings are bsted hdow with our responses: al 'Diversion ditches shove the tadmgs upoundment arc not very well maintauted end should be upgraded.' The diversion ditches have been clraned and deeprned to safety pass a design sWrm. h) "Decant pipes not capable of safely passing the quanhry of water during a design storm." The water ponding Donlon oC the tatlvtgs pond weer supposedly designed to conlairt a desiptt storm end the decant Imes were tnetelled to remove the deergn storm water ova a period of several days. e) "Recommended that the crest of the embanlmtcnt should be widened and the outslape Oattened.' The embanlonertt crest and dam outalope were approved by CMLRB and the etarta dam was built in accordance with spenfuahons. CUM, Ina. u currently reviewing the specifications but cannot give an opinion tin the stability until a complete evelueoon w made. The pond appears to be stable vt its cunettt configuration end the dam crest sppears [o be wide enough 17, The Gold Hill Mill does not see a compelling rmson to Cence the entire mill complex There is cunatdy a fence around the tarhnga unpoundmmt and ilris frnce will be maintained and upgraded during the life of the operation until the tailings era is reclemred. 18. The tailings dam, as prcxnlty configured, is the original starter dam without any raises. The sterna dent was not built by the upstream method. 19. The starter dun (drke) was built tiom material that was tekrn from the retention pond arcs upstream t}om the dam Drawutgs recrndy obtained by the Division (April 2a, 1995) from Mark Steen show dre confrguration of the starter dam and borrow azea. The "as•buill" drawings show a dam treat that is 10 to I?- feet ut width with a downstream slope of approximately I.3: i Height of the embenhnent is hard to determine beceuu the drawings end seedona do not show original Bound or contotas, however, rough meastuemenb on the section indicate en emhenlmrent that is 4 to 8 feet in height at crnteriirre, 10. The original plans frn ilx tailings impoundment inchrded s eapage eolleclion system that would pipe the seepage to the Haul A edit lust prior to constrttcborL the Divisors requeskd that a synthetic bner be instelltd. 'ihe lira does not allow any seepage 4vough the dun and, the[efore, no seepage collection weer rnstalled. Decant lines nurently collect excess water fiom storm runoff +nthin the tailings rttrntion pond arts and diced them through a pipeline to the Hazel A edit. Decant wakr is then recycled from the Hsu] A back to the mill ?l. COM, Inc. plans to rue soda ash, pine od, and xanthek for mill processing. If any other chemicals are requred N the millitrg process, a technical revision, if required by the D.M.G., will be filed with the Division. The chemicals are eurrendy bour,~rt to buck and the following maximum ~ruurnties will t+e stored 9I the mill: Soda Ash 30,000 pounds Pine Od 2,000 ganoru )Wrthak 2,000 galloru