London Extension Tunnel Water Treatment

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London Extension Tunnel Water Treatment

• Water treatment does not have to cost
• Millions

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London Extension Water Treatment Plant

• Located in central Colorado 100 mi southwest of
  Denver
• Elevation over 11,000 feet
• Initial Evaluation and Bench scale testing
• Design/construct for 140,000
• Operated and de-bugged by DRMS personnel
• Operated year round on limited budget
• Subsequently modified based upon our experience
• Now operated by land developer

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London Extension Tunnel
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Mine Site
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London Extension Mine Before Construction
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Sketch of Water Treatment Plant
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Sketch of water sampling sites
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London Extension Tunnel After Construction
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Winter in the Rockies
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Bulkhead with ice
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Upper Sludge Pond
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Ice on floor of drift and rough-looking timber
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Used CKD Tank
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Vibrator to help CKD Flow
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Electrical Control Panel
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pH Sensor in pit
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Pipeline
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Pond Layout
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Settling Pond
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Settling Pond Sediment Delta
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Drying Pond
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CKD Buildup
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More CKD Buildup
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Feeder Cleaner (Leaf Rake)
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Interior of building
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Road closed by snowdrift
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Sketch of water sampling sites
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Manganese Reduction
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Percent Reduction in Manganeserelated to pH
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Zinc Reduction
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Percent Reduction in Zincas compared to pH
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Conclusion

• We see significant reductions in Zinc and
  Manganese
• The system is extremely sensitive to pH
• Comparable reductions are seen in other metals of
  concern
• The plant is simple and easy to operate
• With Good Samaritan legislation, there should be
  10 to 20 of these operating in Colorado alone

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Some days, snowshoes work best
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CONSTRUCTION COST (1997) 140,000 ANNUAL
KILN DUST COST 7,500 ANNUAL ELECTRIC
COST 500 ESTIMATED ANNUAL SLUDGE DISPOSAL
COST 1,000 ESTIMATED MAINTENANCE
COST 2,000- 5,000
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Our friendly staff is available to answer any
questions after the presentation