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United States Environmental Protection Agency
EPA's MIW Treatment Technology Report, INAP's Sustainable Mining Program, and Barrick Gold's Remediation and Sustainable Mining Efforts in the Dominican Republic
Sponsored by: U.S. EPA Technology Innovation and Field Services Division
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November 17, 2014, 2:00 PM - 4:00 PM, EST (19:00-21:00 GMT)


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Presentation Overview:

This webinar features three presentations delivered at the 2014 National Conference on Mining Influenced Waters (MIW). The session highlights EPA's efforts to identify lower-maintenance and innovative MIW treatment technologies, work being conducted by the International Network for Acid Prevention (INAP), and efforts undertaken by Barrick Gold Corporation to clean up and implement best industry practices at a mining-impacted river in the Dominican Republic.


  • EPA Report On Treatment Technologies For Mining-Influenced Water
    Presented by: Michele Mahoney, EPA

    EPA is evaluating more cost-effective and lower-maintenance treatment systems to decrease the costs and improve the efficiency of mine site cleanups. This presentation showcases information in a 2014 EPA report on select MIW treatment technologies used or piloted as part of remediation efforts at mine sites. The report is targeted to federal, state and local regulators, site owners and operators, consultants, and other stakeholders, and includes short descriptions of treatment technologies, information on the contaminants treated, pre-treatment requirements, long-term maintenance needs, performance, and costs. Technologies described are applicable to treatment of water from both coal and hardrock mine operations. Sample sites illustrate considerations associated with selecting a technology. Website links and sources for more information on each topic are also included.

    This report focuses on passive treatment methods, but also includes recently developed or not widely utilized active treatment systems and passive-active hybrid systems. The report does not include all traditional active technologies, such as lime precipitation or high-density sludge systems.

  • Partnering to Support Sustainable Mining
    Presented by: Terrence D. Chatwin, Ph.D., INAP

    This presentation will identify INAP and describe how this mining company network is partnering with other mining stakeholders to support sustainable mining. The key element to our sustainable mining program is the Global Acid Rock Drainage (GARD) Guide, an international best practice guide for the prevention of acid-rock, neutral and saline drainage.

    Since the GARD Guide was rolled out in 2009, it has become accepted as a major guidance document for the prevention and mitigation of mine-influenced waters and is used by a diverse collection of mining stakeholders ranging from mining companies to regulators, academics and communities to support sustainable mining. The presentation will include examples of its application in a multitude of climatic and geologic conditions, and will illustrate how INAP and its Global Alliance partners are building stakeholder capacity in developing regions including some new activities to enhance our educational tools.

  • Dramatic Improvements at Margajita River, Pueblo Viejo Gold Mine, Dominican Republic
    Presented by: Carlos E. Tamayo Lara, Ph.D., M.B.A., P.E., Barrick Gold Corporation

    The six-kilometer long Margajita River is one of the largest freshwater bodies in Dominican Republic (DR). The river skirts Barrick's Pueblo Viejo mine before winding its way into Hatillo reservoir. For decades, the river was highly acidic (pH <3) as a consequence of acid rock drainage from the old waste rock dumps and previous State-owned operator Rosario Dominicana facilities. Metal concentrations exceeded DR quality standards by orders of magnitude.

    Pueblo Viejo Dominicana Corporation (PVDC) started commercial operations at the Pueblo Viejo Gold Mine in 2013. Barrick Gold Corporation (operator) holds 60 percent interest while Goldcorp holds 40 percent interest. PVDC has put in a lot of effort to clean up and implement best industry practices at this brownfield site, and dramatic improvements in water quality have been seen over the past year. This presentation will discuss the cleanup efforts at the Margajita River, the impacts on local communities, and PVDC's plans for the future of this site (PVDC has committed $75 million to fund the remediation of historical environmental liability that belongs to DR State).
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