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BMRI--San Luis 1998 Backfitt Geochemistry I • Time-seri l ti f i h l d es eva ua ons o geoc em ca tren s to determine the rate at which "flushing" is occurring in the system. I Th h i e geoc em cal evaluations will be most useful if they are coordinated with the geohydrological investigations. I 4. Because the geohydrologic system is undoubtedly heterogeneous both physically and chemically, it is not likely that the "flushing" will occur unifomtly in time over the ' entire backfilled woe. If there are woes that flush slowly, it will be because the flux of background water through those woes is less than in more permeable I portions of the system. On the other hand, if water is moving slowly through such woes, then the loading to the down-gradient system from those woes will, necessarily, be controlled (because mass can move out of the pit. into the alluvial I system oNy by ground-water flow). I REFERENCES: I AI, T.A., D.W. Blowes, and J.L. Jambor, 1994. A Geochemical Study of the Main Tailings Impoundment at the Falconbridge Limited, Kidd Creek Division Metallurgical Site, Timmins, Ontario, in D.W. Blowes and 1.L. Jambor (Eds.), I The Environmental Geochemistry of Sulfide Mine-Wastes: Mineralogical Association of Canada, Short Course Handbook, v. 22, p. 333-364. I Alpers, C.W., D.W. Blowes„ D.K. Nordstrom and J.L. Jambor, 1994. Secpndary Minerals and Acid Mine-Water Chemistry, in D.W. Blowes and J.L. Jambor I (Eds.), The Environmental Geochemistry of Sulfide Mine-Wastes: Mineralogical Association of Canada, Short Course Handbook, v. 22, p. 247-270. I Blowes, D.W., C.J. Ptacek, and l.L. lambor, 1994. Remediation and Prevention of Low-Quality Drainage from Tailings Impoundments, in D.W. Blowes and J.L. Jambor (Eds.), The Environmental Geochemistry of Sulfide Mine-Wastes: ' Mineralogical Association of Canada, Short Course Handbook, v. 22, p. 365- 379. I I I I Logsdon, M.J., 1995. Backfilling the West Pit -San Luis: Sequential Batch Leach Tests of Pink Gneiss. Memorandum from Geochimica, Inc. to J. Dillie (DMG), dated 18 October 1995. Morin, K.A. and N. M. Hutt, 1997. Environmental Geochemistry of Minesite Drainage: Practical Theory and Case Studies. MDAG Publishing, Vancouver, B. C., Canada. I Geochimrca, Inc. l~Nov-98 I