1996-02-08_HYDROLOGY - M1977378 (7)

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Surface Mill Tailings at Eureka Page 2 Site Loading Estimate(cont } Annualized loading was calculated using rainfall data (proportionally adjusted for site elevation between the Silverton and Red Mountain weather stations), exposed area of waste dump or tailings site and loading based on 1:1 water bath test results. For comparison to adit flow loadings projects, the annualized loading was converted to an average daily loading. Based on these assumptions and procedures SGC, estimates that the average daily loading for this site may be as much as 3.6 pounds of dissolved zinc per day. SGC is under no obligation to defend these estimates and they should only be used as an estimate. SGC does not represent that its mitigation project at this site will remove any specific percentage of metals loading from this site: the loading estimate contained herein does not form the basis of an enforceable permit obligation. Description of Project Sunnyside Gold Corporation(SGC)will provide sediment catchment traps below the tailings, then remove tailings, add high pH material to stabilize pH near neutral and redeposit tailings at the Mayflower Tailings Pond #4. Under Sunnyside Gold Corporation's MLR Permit M-77-378 this material can be consolidated into Tailings Pond #4. The tailings would then be capped with growth media and planted as part of the approved reclamation plan at Tailings Pond#4. Any material caught in the catchment traps will also be removed. This project may require a 404 permit from the Army Corps of Engineers due to work occurring in a flood plain. This plan is also subject to notification requirements for disturbance of Historical Mining Sites to the board of the San Juan County Commissioners. The area is an active alluvial fan with little or no topsoil or vegetation therefore, seeding is not planned. This work is planned to take place in 1996 during late summer and early fall. It is envisioned that notification prior to starting will be given and a final report on total yards moved and amount of alkaline material used will be submitted after construction is completed. Work Plan 1)Build sediment catchment traps as needed to contain material during excavation. 2)Load and haul tailings material to Tailings Pond#4 at the Mayflower Mill. 3) Add pH neutralizing material to tailings. 4)Regrade alluvial fan to blend in with surrounding topography. Analysis Removal of the tailings from rain and snow melt and capping is a best management practice used to isolate materials from direct contact with the environment. Monitoring Due to the close proximity to and the high flows which occur in the Animas River, no monitoring is contemplated for this project. The Project is not well enough contained to allow for any sampling to accurately reflect possible dissolved metal contributions to the Upper Animas Watershed.