| Safety
- Challenges _____________________________________________________________ |
| Control
of Diesel Particulate Matter Beginning in 2001 to present, Stillwater Mining Company has conducted extensive research of available diesel particulate matter (dpm) control technologies in an effort to comply with tightened underground air quality standards. Company research was expanded to include partnerships with various engine manufacturers, government agencies, trade associations and industry coalitions. Having the ability to conduct isolated zone studies makes the Stillwater Mine a unique test ground for new dpm control technologies. The Stillwater Mine in partnership with the Mine Safety and Health Administration (MSHA), National Institute for Occupational Safety and Health (NIOSH) and the MARG Diesel Coalitions have conducted two extensive isolated zone studies to determine the effectiveness of individual dpm controls as well as controls used in combination. Once the effectiveness of these controls was determined in an isolated zone, a phase two study was undertaken to determine their effectiveness in an actual mining environment. A third study was completed in 2004 to research the potential for alternative fuels, fuel additives and ultra low sulfur fuels when used in combination with a variety of diesel particulate filters. Both the Stillwater and East Boulder mines have completed extensive upgrades to improve mine ventilation systems. Ventilation improvements were initiated to increase the volume of air entering the mine, minimize the re-use of air by multiple work locations, increase intake to exhaust streams and create additional fresh air escape-ways. Unfortunately, even with the extensive research and utilization of diesel particulate filters, ultra low sulfur fuel, bio diesel blends, electronically controlled engines and ventilation improvements, the mines continue to struggle to consistently comply with the MSHA dpm standard. While efforts continue to reduce diesel exhaust emissions, the company has implemented a mandatory respiratory protection program and is beginning to utilize additional electrically powered equipment. Research of feasible control technologies will continue along with industry and agency partnerships until dpm issues can be remedied. |
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