Laserfiche WebLink
• iiiiiiiiiiiiiiuiii • <br />STATE OF <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 />FAX 303 632-6106 <br />OF ~~(O <br />q9 <br />Ne~$ <br />a <br />~ rH]6 ~ <br />Roy Romer, <br />Governor <br />Michael B. Long, <br />Division Director <br />TO: Jim Pendleton //~~ <br />FROM: Allen Sorenson YI~ <br />RE: Flow Rate of Water R/sporting From Tailings to Collection Fond, 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, w'll vary over <br />the life of the impoundment. Ae the attached calculations indica e, the result <br />is a decrease in the flow of water from the tailings into the col ection pond <br />over time. At present there are three components that make up th 250 to 300 <br />gpm flow into the collection pond. Theee components are: <br />1. Interstitial water exiting the tails at the tailing-drainage layer <br />contact <br />2. Storm water that enters the impoundment and reports direcitly to the <br />drainage layer <br />3. Water reporting to the drainage layer as a result of de-wlatering the <br />west pit <br />The attached calculations show that, at the present time, approxim~itely 508 of <br />the 250 to 300 gpm flow into the collection pond consists of water that hoe <br />exited the tailings. <br />Ae the impoundment ie filled with tailings, water from sources 1 a d 2 listed <br />above, will make up a decreasing percentage of the total flow into the <br />collection pond. The reason for this ie simply that increasing am unts 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 tra sit the <br />tails to report to the drainage layer. At some point, near the en of the life <br />of the impoundment, 1008 of water entering the collection pond wil be <br />interstitial tailing water (with the exception of storm water fall nq directly <br />on the collection pond). The attached calculations show this flow rate to be <br />104 gpm. <br />cc: Humphries <br />Oehler <br />Posey <br />Stevens <br />ACS <br />