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Whetstone' <br />Associates <br />Technical Memorandum <br />Figure 1. Detailed Cross Section Showing Presumed Location of Drill Hole Through <br />Upper Mine Workings <br />• Installing equipment for dewatering is technically challenging to accomplish safely. <br />The mine has been shut down since 2000 and was sealed (bulkheaded) in 2007, with <br />approval from DBMS. Access to the Schwartzwalder Mine is now limited to the Sunshine <br />Decline. The Sunshine Decline is a steeply sloping (>45°) adit and earthen/rock ramp that <br />leads from the hillside well above the valley floor down to the Steve Level. Descending this <br />150 - 200-ft ramp is dangerous, but can be achieved with ropes, good lighting, and adequate <br />care to overcome uneven surface, unstable footing, sudden drop offs, and other potential <br />hazards. At the bottom of the slope, all equipment and personnel must pass through a small <br />structural orifice designed to control mine ventilation flows. Finally, several hundred feet of <br />narrow shafts would have to be traversed to reach the mine pool collar at former hoist station <br />on the Steve Level. The Operator entered the mine in December 2009 and found the inner <br />workings to be badly deteriorated, and significant repairs and refurbishment, which would <br />likely include installation of timber sets, roof bolting, debris/muck removal, and other <br />measures, would need to be performed. <br />4109C.100731 14