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<br />llonestnko Flining f.o:ap:u,y <br />tlATC:R TRL•ATFII:\'f PLAT:I' <br />I. Introduction <br />i <br />~,~ u,..~ d r t 5 <br />Nomestakc Flining Company owns and nprratcs thr lail I,lol; Mountain Flinc <br />near Croede, Colorado. The nine became operational in Igo" ^n4 ++as csscnt.ially <br />dry until 1971 when an internal winxo was sttrt~ 460 fcr•t 1~,1~.~.+ ;Itc 9360 or m:+in <br />tunnel level. A development drift from tho wluxo to tho rr~n nn the 9000 Level <br />oneountoral an inflow of Y,600 gallons per minute nfrcr iut~n•:octing the struc- <br />ture. Mining tows, because of the avatar, becnmc so sc•;crc tl::+t a water door <br />was eonstruetot and the raise heading abandoned. <br />Continuous pwaping has since raluced the t+an r inflow to approximately <br />500 gallons per ^inuto. ?:ow development plans require rh;rt t6c 9000 Lcvol be <br />advanced in order to gain access to ore reserves beinw rho 9zun Lrvr:l. 14ator <br />volumes are expeetcrl to i11CMnsC as development lvuccal. north+:arJ. <br />~~ Ths pumped wntcr discharges from the main tuuucl 1+•vrl ++hrrc it flo,+. <br />directly into Mindy Gulch as per legal agreement with the I::ut,iln+a flitch and I'ipo- <br />lino Company. the owner of the t+ntor. from IPindy Gulch, the water flnt+x about <br />one-half tailo to a confluonec with h'illorr Crcok and then nnnr'.rr 2.5 mites to <br />its eonfluenco with the Rio Grano. <br />QtuliFy Of the mine wetor 16 fairly constant, rvcu frith vurylnl; fln.+ <br />Toros and different seasons of analysis. Tltc print;try Iwllurant known i, zinc <br />but suspended solids may also become a problem once dcvc~nl~r.~r:nt on tl,c 9000 l.evol <br />begins. Since 1975 the bulldog Floun[ain Operation has compiled cxtr:nslvr data <br />On the water quality of selected streams in tiro billow Creek Basirt. Kril;ht- <br />NcLaughlin Engineers were hired in 1975 to study the t+atcr ryu:rlity aspects and <br />portal dischar;e.traatment of the Bulldog Flountain Ftinc nrtd tltosc rcl+orts arc <br />filed with the C`lorado Department of Ilealth and Gnvironmenta] Protection Agency. <br />M NPD85 Pormlt was issual to rho Bulldog Flountain Ftinc m, Aul;usr. 29, <br />1974. This peralt seas out guidelines forcing; rite mine to racer "Ite~t Practical <br />Control TOChnol04y Currently Avai lablo" by July 1, 1977. lifflnnnt litni[at ions <br />weze Also desianatad in rho posit and based on existirrl; dlsclurrgr :rn:rlysis, only <br />sinC has been above the effluent limitations. Total zinc:, trrrrlor rite .•~ist irtg <br />diseharte perait wet ba reduced below one part per million :n rho traatal effluent. <br />LJ <br />- lso - <br />4~ ~ , <br />..~ 1 <br />!!r. <br />r ~f', a <br />•/ 1 <br />~~`'~ •' i <br />..r ~. <br />~ ~, `~, <br />~ ~!~ ~. <br />