2012-12-06_PERMIT FILE - M2012032 (25)

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the pond was constructed in old mine waste, and therefore not lined on the bottom, it is believed that the flow now passes through the bottom of the pond and seeps out at the toe of the old waste slope. This seep flows across the low level area in the center of the Revenue Mine area and then into Sneffels Creek. See Map C -1. It is believed this seep is the vast majority of the water that discharges from the mine portal. Both Sneffels Creek and the Atlas drainage can freeze on the surface during many winters but some flow likely still occurs in gravels in the stream beds. A major portion of the Revenue tailings /waste pile is in an avalanche path from the mountain to the south of the mine. This path is shown on Map C -4 based on John Trujillo's' experience, who is the geologist for the mine and has been involved with the property for many years. In most years, an avalanche crosses the existing Revenue Pond and reaches across Sneffels Creek. SMO plans to shoot down avalanches if they pose a threat to the operation but activity in this path can only take place during safe conditions. 4.2 Surface Water Monitoring The monitoring of the surface water regime at the Revenue Mine will be via four surface water sample points. They are all shown on Maps C -1 and G -1, and described below. Sample Point Description SW -1 Sneffels Creek upstream of the Atlas Drainage SW -2 Atlas Drainage (includes Atlas Mine discharge) SW -3 Revenue Seep (believed to be the Revenue Mine discharge) SW -4 Sneffels Creek downstream of Revenue Mine area (includes all surface water flows) All samples taken are tested for a suite of metals and other ions. The surface water samples are being tested for both dissolved and total amounts (includes suspended material) in milligrams per liter. The lab results can be found in Appendix 4, and the sample sites are seen on Maps C -5 and G- Revenue Mine August 2012 G -13