icgge 2003 mike wireman us epa region 8 303-312-6719 [email protected]
TRANSCRIPT
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ICGGE 2003Mike WiremanUS EPA Region [email protected]
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“Characterizing Ground-Water Flow Paths in High Altitude Fractured Rock Settings Impacted by Mining Activities.”
Mike Wireman, U.S. EPA Region 8
Dr. Mark Williams, University of Colorado
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Chalk Creek Mining District-Collegiate Range, CO
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Mary Murphy Gold MineApplied Research Site
Research Objectives: * To Develop Tools for Characterization of Site Hydrology and Geochemistry * To Better Understand Role of Ground Water Transport of Metals to Chalk Creek. Remedial Objectives: * To Determine Metals Loading Sources and Pathways * To Reduce Metal Loadings to Chalk Creek
Partners: * USGS, USFS, University of Colorado & CDMG
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Mary Murphy Gold Mine—Applied Research SiteSite History
• Placer Mined in 1860’s-1870: Vein Deposits Located• 1883-1893: Period of Greatest Mining Activity• Mary Murphy Mine: 1870—1951 * 75% Gold, Silver, Lead, Zinc, Copper * 5 Main Veins * 14 Main Levels * 2200 Vertical Feet * Golf Adit—Drain / Haul Adit * Connected to Iron Chest Mine
• Remedial Work: * 1991—3 Piles Consolidated 69,000 cu. yds., Golf Tunnel Unplugged, Lined Settling Pond * 1992—Golf Adit Water Rerouted * 1998—1400 Level Opened / Stabilized * 1999—700 Level Partially Opened * 2003—Lady Murphy Adit Opened
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Mary Murphy Mine Site
Environmental Characterization History
> Flow Measurements > Steam Tracing 14 Times –1990—2003 > GW Tracing
> Metal Loading > Geochemical 5 Times- 1990—1994 Modeling
> Sediment Sampling > Hydrometrics / Sept. ’93 & June ’99 Isotopic Research
> Water Chemistry > Surficial 17 Times- 1990—2003 Geophysical Work
> Toxicity Testing / Fish Data 11 Times- 1991—2003
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Focus Of This Talk
> Metals Loading > Stream & Ground-Water Tracing
> Hydrometrics / Isotopic Results
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Geology and Mine FeaturesMary Murphy Mine &
Vicinity
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Elements of Conceptual Model
• Strong GW / SW Interaction > Gaining Streams > Strong Upward Gradient in Valley Bottom
• Fracture Dominated Flow Paths Multiple GW Flow Systems
• Many Seeps / Springs
• Significant Seasonal Variation in Flow and Water Quality ( GW & SW)
• Several Water Types
• Chemistry of GW & SW is Strongly Impacted by Geology and Mineralogy of Ore Body, and Mine Features.
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Mary Murphy Gold Mine—Chafee County, CO DISSOLVED ZINC CONCENTRATIONS
Location Date Conc. (ug/l)GW WellsMM-3 9/93 17,131MM-3 7/00 15,830MM-3 2/02 21,500MM-3 5/03 5,570 MM-11 9/93 188MM-11 7/00 210MM-11 7/02 179MM-11 5/03 560
MM-6 9/93 2605MM-6 7/02 13,700MM-6 122,000
MM-15 9/93 45MM-15 7/02 08
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Mary Murphy Gold Mine—Chafee County, CO DISSOLVED ZINC CONCENTRATIONS (CONTINUED)Location Date Conc. (ug/l)Chalk CreekCC-0 9/90 < 100CC-0 7/02 08
CC-6 9/90 420CC-6 2/02 417CC-6 5/03 534
CC-7 9/90 18,000CC-7 7/00 27,710CC-7 7/02 24,300CC-7 3,620
CC-7D 9/90 110CC-7D 7/02 44CC-7D 5/03 53.2
CC-9 9/90 < 100CC-9 7/00 118CC-9 7/02 24CC-9 5/03 35.2
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Scope of Ground-Water Tracing
Mary Murphy Mine—Applied Research Site
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Results of Ground Water Tracing
Mary Murphy Mine
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Inverse Geochemical Modeling
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Variation of Discharge Components Versus Time in 1400 Level.Mary Murphy Gold Mine
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Isotopic Composition of WatersMary Murphy Gold Mine
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Delta O-18 in Selected Tributary Inflows, 1400 LevelMary Murphy Gold Mine
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Pre-event Water and Event Water in Total Discharge From 1400 PortalMary Murphy Gold Mine
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