Characterizing Ground-Water Flow Paths in High -Altitude Fractured - Rock Settings Impacted by...
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![Page 1: Characterizing Ground-Water Flow Paths in High -Altitude Fractured - Rock Settings Impacted by Mining Activities Mike Wireman, U.S. EPA Region 8 Dr. Mark.](https://reader035.fdocuments.us/reader035/viewer/2022062721/56649f1d5503460f94c34c49/html5/thumbnails/1.jpg)
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
![Page 2: Characterizing Ground-Water Flow Paths in High -Altitude Fractured - Rock Settings Impacted by Mining Activities Mike Wireman, U.S. EPA Region 8 Dr. Mark.](https://reader035.fdocuments.us/reader035/viewer/2022062721/56649f1d5503460f94c34c49/html5/thumbnails/2.jpg)
Mary Murphy Gold MineMary Murphy Gold MineApplied Research SiteApplied 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
![Page 3: Characterizing Ground-Water Flow Paths in High -Altitude Fractured - Rock Settings Impacted by Mining Activities Mike Wireman, U.S. EPA Region 8 Dr. Mark.](https://reader035.fdocuments.us/reader035/viewer/2022062721/56649f1d5503460f94c34c49/html5/thumbnails/3.jpg)
Mary Murphy Gold Mine—Applied Research SiteMining 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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Chalk Creek Mining District-Collegiate Range, CO
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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.
![Page 9: Characterizing Ground-Water Flow Paths in High -Altitude Fractured - Rock Settings Impacted by Mining Activities Mike Wireman, U.S. EPA Region 8 Dr. Mark.](https://reader035.fdocuments.us/reader035/viewer/2022062721/56649f1d5503460f94c34c49/html5/thumbnails/9.jpg)
Mary Murphy Gold Mine—Chafee County, CO DISSOLVED ZINC CONCENTRATIONS Location Date Conc. (ug/l)Chalk CreekCC-9 9/90 < 100CC-9 7/00 118CC-9 7/02 24CC-9 5/03 Upstream of Pomeroy 35.2
CC-7D 9/90 110CC-7D 7/02 44CC-7D 5/03 Upstream of Golf 53.2
CC-7 9/90 18,000CC-7 7/00 27,710CC-7 7/02 24,300CC-7 Golf Adit 3,620
CC-6 9/90 420CC-6 2/02 417CC-6 5/03 Upstream of Iron Chest 534
CC-0 9/90 < 100CC-0 7/02 At Arkansas 08
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Mary Murphy Gold Mine—Chafee County, CO DISSOLVED ZINC CONCENTRATIONS
Location Date Conc. (ug/l)GW WellsMM-15 9/93 45MM-15 Bedrock 7/02 08
MM-11 9/93 188MM-11 7/00 210MM-11 7/02 179MM-11 Allurial 5/03 560
MM-3 9/93 17,131MM-3 7/00 15,830MM-3 2/02 21,500MM-3 Bedrock 5/03 5,570
MM-6 9/93 2605MM-6 7/02 13,700MM-6 Allurial 122,000
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![Page 13: Characterizing Ground-Water Flow Paths in High -Altitude Fractured - Rock Settings Impacted by Mining Activities Mike Wireman, U.S. EPA Region 8 Dr. Mark.](https://reader035.fdocuments.us/reader035/viewer/2022062721/56649f1d5503460f94c34c49/html5/thumbnails/13.jpg)
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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
![Page 18: Characterizing Ground-Water Flow Paths in High -Altitude Fractured - Rock Settings Impacted by Mining Activities Mike Wireman, U.S. EPA Region 8 Dr. Mark.](https://reader035.fdocuments.us/reader035/viewer/2022062721/56649f1d5503460f94c34c49/html5/thumbnails/18.jpg)
Inverse Geochemical Modeling
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Variation of Discharge Components Versus Time in 1400 Level.Mary 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
![Page 24: Characterizing Ground-Water Flow Paths in High -Altitude Fractured - Rock Settings Impacted by Mining Activities Mike Wireman, U.S. EPA Region 8 Dr. Mark.](https://reader035.fdocuments.us/reader035/viewer/2022062721/56649f1d5503460f94c34c49/html5/thumbnails/24.jpg)
Tritium vs Delta O-18 Mary Murphy Mine Site (2002-2003)
-22.00
-20.00
-18.00
-16.00
-14.00
-12.00
-10.00
8 10 12 14 16 18 20
Tritium (TU)
Del
ta O
-18Surface Water
Alluvial Wells
Bedrock Wells
Snow
Mine Samples
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HELIUM DATAMary Murphy Mine site
ESTIMATED AGES OF GROUND WATER • Using tritium data from different date
• t = 12.43/ln2 . ln ( 1 + [3Het] / [3Ht] ) Clark & Fritz p188
BEDROCK WELLS• MM 3 - 2-4 YRSMM 3 - 2-4 YRS
• MM 18 - 2-3 YRSMM 18 - 2-3 YRS
• MM 15 - ABOUT 8 YEARS OLDMM 15 - ABOUT 8 YEARS OLD
ALLUVIAL WELLS• MM11 - 3-4 YRSMM11 - 3-4 YRS
Source – A. Manning -USGSSource – A. Manning -USGS
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