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Silver Wing Mine NOI <br /> 1. Pre-existing disturbances consist of pre-law(1976)on site disturbances including: <br /> 1. Site Access Road and Bridge over the Animas River. <br /> See Exhibits D,and F. <br /> 2. On-site Roads <br /> See Exhibits D, E, F, H, I,J,and K. <br /> 3. Mine Dumps—upper dumps at portal level and large dump below old log cribbing. <br /> See Exhibits D, E, F,J, K,and L. <br /> 4. Mine buildings including long building on the portal level (to the north of the portal area) containing <br /> sections for air compressors, change room and shop area;and, ore bin/change room located <br /> approximately 50 feet in front of the portal and supported on the upper mine dump. <br /> See Exhibits D, E, H,J, K, and L. <br /> 5. Two electric air compressors located in compressor section of mine building. <br /> See Exhibit E (north end)and K. <br /> 6. Remains of old snow sheds—of both steel frame and timber frame with galvanized iron covering. <br /> See Exhibit J,and K. <br /> 7. Remnants of old boards and timbers from previous operations. <br /> See Exhibits I,J, K,and L. <br /> 8. Remnants of old ventilation piping and other piping and mining equipment/materials. <br /> See Exhibits I,J,and L. <br /> 9. Access Bridge over Animas River—old timber bridge. <br /> See Exhibit D,and F. <br /> 10. Remnants of old mill building between the toe of the upper and lower dumps and the Animas River. <br /> See Exhibits D and E. <br /> Pre-existing disturbances after 1976 including: <br /> 11. Sedimentation Pond and associated piping(CDPHE 319 Grant Project). <br /> See Exhibit G and H. <br /> 11. Remains of bio-reactor poly tank containment vessels (8)—experimental passive treatment system <br /> for mine discharge water(CDPHE 319 Grant Project). <br /> See Exhibit N. <br /> 12. Mine Portal structure consisting of steel sets and timber lagging(CDPHE 319 Project). <br /> See Exhibits I and J. <br /> 1 <br />