

 |
|
Original Time/Date of Presentation: |
December 17, 2014, 1:00 PM - 3:00 PM, EST (18:00-20:00 GMT)
You may also be interested in the following related archives:
- Technology Transfer and Training Resources for Mining Sites (June 13, 2012)
- Mining-Influenced Water: Environmental Issues, Remediation Research, and Tools for Estimating Remediation Cost (September 19, 2012)
- Mining-Influenced Water: Treatment Technologies (February 6, 2013)
- NARPM Presents...Ecological Revitalization Using Natural Materials (May 14, 2013)
- Mining Site Metals: Exposure Pathways and Bio-Assays (September 3, 2013)
- Soil Amendment Applications and Mine Site Restoration Impacts on Soil Ecosystem Services (May 7, 2014)
- Using Biosolids and Coal Combustion Products for Soil Remediation at Mining Sites (July 24, 2014)
- Mining Remediation and Sustainability (November 17, 2014)
- Mine Tailings Fundamentals: Current Technology and Practice for Mine Tailings Facilities Operations and Closure (May 19, 2015)
- Mine Tailings Fundamentals: Current Technology and Practice for Mine Tailings Facilities Operations and Closure (May 20, 2015)
- Remedial Action, Remedy Performance, and Long-Term Land Management at the Anaconda Smelter NPL site (June 4, 2015)
- Screening, Testing, and Application of Residuals and Byproducts for Remediation (December 2, 2015)
- Identifying the Potential for Methylation of Mercury at Mining Sites (March 29, 2016)
- NEPA and Mining 101, Part 1: Mining Fundamentals (May 12, 2016)
- NEPA and Mining 101, Part 2: Mining Environmental Concerns and Issues (May 24, 2016)
- NEPA and Mining 101, Part 3: Regulatory Process & How the Public and Tribes can Engage (June 8, 2016)
- Passive Treatment of Mining-Influenced Water: From Bench Scale to O&M (November 14, 2016)
- Overview, Lessons Learned and Best Practices Derived from Independent Optimization Reviews of Superfund Mining Sites (May 24, 2017)
- Matching Biochar Characteristics with Metals-Contaminated Soils to Effectively Reduce Metal Bioavailability at Mining Sites (November 7, 2017)
- Mining Webinar Series: Ecological Revitalization at the Henry's Knob Former Mining Site (March 6, 2018)
- Mining Webinar Series: Successful Implementation of Biologically-Based Passive Remediation Systems (May 1, 2018)
- Long-Term Performance of Biochemical Reactors for Passive Treatment of Mine-Impacted Water (April 23, 2019)
- EPA Office of Research and Development's Office of Science Policy Mine and Mineral Processing Virtual Workshop Session 1 - Site Characterization (October 2, 2019)
- EPA Office of Research and Development's Office of Science Policy Mine and Mineral Processing Virtual Workshop Session 2 - Emergency Management (October 9, 2019)
- EPA Office of Research and Development's Office of Science Policy Mine and Mineral Processing Virtual Workshop Session 3 - Innovative Technologies and Strategies (October 16, 2019)
- EPA Office of Research and Development's Office of Science Policy Mine and Mineral Processing Virtual Workshop Session 4 - Big Data (October 23, 2019)
- Considerations for Bulkheading Draining Mine Tunnels (October 25, 2019)
- Mining Webinar Series: Eagle Mine Superfund Site Case Study (January 21, 2020)
- Revegetation of Mine Wastes in Arid Environments: Linking Above- and Below-Ground Performance (August 12, 2020)
- Mining Webinar Series: Evaluation of Rotating Cylinder Treatment System™ at Elizabeth Mine, Vermont (March 16, 2021)
- Mining Webinar Series: Assessment and Rehabilitation of Humid Region Mine Sites and Wastes (May 18, 2021)
- Ecosystem Services - Benefits and Considerations for the Cleanup of Contaminated Mine Sites (September 21, 2021)
- Ehrenfeld AML Pilot Reclamation/Recreation & Watershed Improvement Project (December 1, 2021)
- Toward Sustainability of Passive Treatment in Legacy Mining Watersheds: Operational Performance and System Maintenance (February 16, 2022)
|
|
Presentation Overview: |
This webinar features three presentations on mining-influenced water (MIW) treatment delivered at the 2014 National Conference on Mining Influenced Waters. The session focuses on approaches to MIW treatment, operations and maintenance (O&M) challenges, and characterization and remediation of MIW treatment issues at two Superfund sites.
- Iron Mountain Mine Superfund Site — Long Term O&M Challenges
Presented by James Sickles, EPA Region 9
Nearly 100 years of mining at the Iron Mountain Mine Superfund Site in Shasta County, California resulted in extensive workings and fractured rock, creating pathways for air and water to oxidize the massive sulfide ore. This resulted in the development of MIW with pH as low as -3.6 and the release of tens of thousands of pounds of heavy metals per day into the surrounding drainages and water bodies, before remediation reduced metals loading by more than 97%.
Unusual O&M issues at the site comprise: (a) the formation of mineral precipitates in MIW conveyance pipelines; (b) the accelerated deterioration of the urethane liner for the Upper Spring Creek Diversion, which diverts uncontaminated water to Flat Creek; (c) the significant loss of filtrate from the lined Brick Flat Pit that is used to store the high density sludge from the treatment plant, suggesting that the landfill is leaking into mine workings below; and (d) the ongoing deterioration of the concrete ore chute plugs in the Richmond Adit along with the location of the Lawson Adit in the Boulder Creek landslide, both of which are key parts of the MIW collection systems.
- Characterization and Remediation of Iron(III) Oxide-Rich Scale in a Pipeline Carrying Acid Mine Drainage at Iron Mountain Mine, California, U.S.A.
Presented by Kate M. Campbell, U.S. Geological Survey
A pipeline carrying acid mine drainage (AMD) to the treatment plant at the Iron Mountain Mine Superfund Site (California, U.S.A.) has developed substantial scaling over the past several years, resulting in spillage of AMD and requiring frequent and costly clean-out. The objectives of this work are to characterize the pipe scale composition, identify biogeochemical processes leading to its formation, and identify possible strategies to prevent or retard its formation in the pipeline.
Samples of the scale and AMD water samples from five points along the pipeline were collected prior to clean-out during a low-flow period in August 2012. Additional AMD samples will be collected at various times during high-flow conditions to evaluate seasonal variation in water chemistry and possible effects on scale formation. The mineralogy and microbial community of the scale samples were characterized. A biogeochemical model using PHREEQC was developed to simulate the rates and processes involved in scale formation. Potential remediation options to prevent scale formation are to lower the pH of the influent AMD by continuously mixing it with water from the Richmond portal (approximate pH 0.5-1.0) or to periodically flush the pipeline with Richmond portal water. The potential viability of these options will be evaluated in laboratory batch experiments with AMD from the pipeline and the Richmond portal, mixed with scale removed from the pipeline.
- Tackling AMD, Mining Impacted Groundwater, Private Mine Ownership in a Superfund Site that Spans the Panhandle
Presented by Bill Adams, Kim Prestbo, and Ed Moreen, EPA Region 10
The Bunker Hill Mining and Metallurgical Complex Superfund Site, listed on the NPL in 1983, is located within one of the largest and most productive historical mining districts in the world. Historic disposal practices led to the mining-related hazardous substances being dispersed in nearly every aspect of the environment. As a result of the cleanup actions undertaken by EPA and the Idaho Department of Environmental Quality to address exposure to lead and other heavy metals, excellent progress has been made from both aesthetic and risk reduction standpoints. However, significant loading of dissolved metals continues to occur and many more years of work are necessary to fully achieve the cleanup goals for human health and water quality standards.
This presentation will provide a brief history of this well-known site, including EPA ownership and management of the water treatment plant. It will also provide an in-depth look at the 2MGD+ Acid Mine Drainage water quality (the groundwater collection system being designed that will almost double the flows to be treated at the Central Treatment Plant), and discuss a recent optimization study and value engineering exercises that were pursued to ensure the most cost effective remedial action.
|
 |
Presenters: |
Instructors:
Moderator:
|
 |
Participation Tips and Suggestions |
|
 |
 |
Press the "Go to Seminar" button to join the
Adobe® Connect™ meeting room. Please be at this location at the beginning of the seminar. |
 |
 |
After the seminar is complete, please
view: |
|
|