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Processing Plan Circuit <br /> The San Luis plant or mill facility with associated <br /> beneficiation-tanks is engineered as a fully-contained area, Syr` <br /> i.e. , continuous cement slab and curbing to contain potential vie, <br /> spillage. Some minor spills from leach tanks have occurred but h <br /> have been completely contained in this area with no release to <br /> the environment. J�0 <br /> Tailings Pile Leak Detection <br /> BMR believes the MLRD reference is to the leak detection <br /> system incorporated into the double-lined collection pond located <br /> below the tailings facility. Some seepage through the primary <br /> liner during start-up was reported to MLRD. The primary liner <br /> has been repaired and seepage has been significantly reduced. <br /> BMR believes the secondary synthetic liner and compacted subgrade <br /> has not allowed any of the primary liner seepage to escape into <br /> the environment. Monitoring well M-9 is located downgradient <br /> from the collection pond as well as the tailings facility and, as <br /> noted above, has reflected no change in water quality. <br /> Piezometers <br /> Piezometers placed in the tailings embankment to measure <br /> potential pore pressure as a result of a phreatic surface build- <br /> up has not indicated any significant build-up of pore pressure <br /> according to design engineers Steffen Robertson and Kirsten. <br /> Lysimeters <br /> Three sets of vacuum lysimeters consisting of two lysimeters <br /> per set are located below the tailings facility as required by <br /> the water rights decree. All the lysimeters have been <br /> consistently dry with the exception of L3W-4392 which has <br /> reflected small amounts of natural moisture. While the sample <br /> volumes were too small to obtain reliable analytical results, <br /> BMR nevertheless had the samples analyzed by Acculab. The <br /> enclosed analytical data indicates a total cyanide concentration <br /> at the detection limit. These analytical results reflect the <br /> effects of the small sample volumes and resultant analytical <br /> interference in the cyanide analyses. Please refer to the <br /> enclosed correspondence from Dr. Adrian Smith for a thorough <br /> discussion of the analytical results. Dr. Smith concludes that <br /> the data sets are invalid due to sample size and do not reflect <br /> the presence of cyanide in the sample. <br />