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iii iiiiiiiiiiiuiii • <br />989 <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman St.. Room 215 <br />Denver, CO 80203 <br />303 866-3567 <br />Fn x: 303 832-8106 <br />STAT~OF COLORADO <br />pF Cpl <br />HP ~~ ~ O <br />1 <br />.~~ . <br />/e ]6 <br />Roy Romer, <br />Govemar <br />Michael B. Long. <br />Division Director <br />TO: Jim Pendleton <br />FROM: Allen Sorenson '• <br />RE: Flow Rate of Water Reporting From Tailings to Collection Pond, Battle <br />Mountain Gold, San Luie Project, File No. M-88-112 <br />DATE: August 14, 1992 <br />The permeability of the tailings, and the area that they cover, will vary over <br />the life of the impoundment. Aa the attached calculations indicaRe, the result 'G~r <br />is a decreaee in the flow of water from the tailings into the collection pond (,(,~ <br />over time. At present there are three components that make up the 250 to 300 ~" f"~' <br />gpm flow into the collection pond. These components are: ~~ <br />Ikw ~I~ 3~yxr, <br />1. Interstitial water exiting the tails at the tailing-drainage layer Iw~~> 'w <br />contact ,(~ J~L',"~I <br />2. Storm water that enters the impoundment and reports directly to the <br />drainage layer ~^^~ <br />3. water reporting to the drainage layer ae a result of dewwatering the <br />west pit <br />The attached calculations show that, at the present time, approxilmately 504 of <br />the 250 to 300 gpm flow into the collection pond consists of water that has <br />exited the tailings. <br />As the impoundment is filled with tailings, water from sources 1 and 2 listed <br />above, will make up a decreasing percentage of the total flow inho the <br />collection pond. The reason for this is simply that increasing amounts of the <br />drainage layer will be covered by tailings, until a point near the end of the <br />operation when all water entering the impoundment will have to transit the <br />tails to report to the drainage layer. At some point, near the end of the life <br />of the impoundment, 1004 of water entering the collection pond will be <br />interstitial tailing water (with the exception of storm water falling directly <br />on the collection pond). The attached calculations show this flmw rate to be <br />104 gpm. <br />cc: Humphries <br />Oehler <br />Posey <br />Stevens <br />ACS <br />