Anaconda - What’s happening at the Site?

Below is a brief overview of what is currently planned to happen at the Anaconda Copper Mine Site (ACMS) over the next three months. Following that, are highlights of what has been accomplished at the site over the past three months.

If you would like to see additional information added to this page or have any other suggestions, please email the NDEP ACMS team at acms[at]ndep.nv.gov.

This page was last updated: June 28th, 2019.

What will be happening in the next three months:

July:
The Atlantic Richfield Company (ARC) will be submitting the Final Closure Management Unit (CMU) 2 and 6 Fluid Management System (FMS) Ponds Remedial Design (RD) Report. This report was considered a major document. Stakeholders had 45 days to review and comment on the document. NDEP then provided comments and direction to ARC, on how to finalize the document.

ARC will be submitting the Final OU-1 Plume Stability Technical Memorandum (TM).

ARC will be submitting the Final OU-1 Geothermal Evaluation TM.

The Community Involvement and Participation Plan (CIPP) for the ACMS was finalized in July 2018, and is nearing its first annual update. Please find the current CIPP here. NDEP encourages readers of the CIPP to provide their feedback regarding the document to our site email, acms[at]ndep.nv.gov. Community feedback will allow NDEP to understand if there are any deficiencies in the document or areas in the document that can be amended to help the community understand the cleanup process and how to obtain information or provide input more clearly. Please see guidance on providing constructive feedback here. An updated version of the CIPP will be posted on the website.

August:
NDEP will collect and collate stakeholder comments on the Draft OU-4a Remedial Investigation (RI) Report. NDEP will also provide direction to the Atlantic Richfield Company (ARC) on how to finalize the document incorporating stakeholder input.

The Draft Closure Management Unit (CMU) 2, 4, 5, 6, and 7 Heap Leach Pads Regrading and Cover Remedial Design Report is due.

Construction on ROD1 ponds is anticipated to begin this month.

September:
The Draft OU-3 Human Health Risk Assessment (HHRA) and Screening Level Ecological Risk Assessment (SLERA) Report is due. This is considered a major document and is subject to a 45 day review and comment period.

The Atlantic Richfield Company (ARC) will be submitting the Revised Draft OU-1 Remedial Investigation (RI) Report. This is also considered a major document and is subject to a 45 day review and comment period.

ARC will be submitting the Draft OU-7 RI Report. This is also considered a major document and is subject to a 45 day review and comment period.

What was accomplished in the previous three months:

June:
NDEP held a public meeting on June 25, 2019 at the Yerington Library. The meeting focused on the mine closure construction schedule, a groundwater investigation update, and proposed groundwater criteria. For more information regarding the meeting, like copies of the presentation and posters, please see the NDEP’s June 2019 Public Meeting section below.

The Atlantic Richfield Company (ARC) submitted the Draft OU-4a Remedial Investigation (RI) Report. Stakeholders have until August 5, 2019 to provide comments on the document.

ARC submitted the updated Official Schedule for the Site.

May:
NDEP collated comments from stakeholders, Tribes and agencies, and provided comments and direction to the Atlantic Richfield Company (ARC) on how to produce the Draft Revised OU-1 Remedial Investigation (RI) Report on May 29.

ARC submitted the final Fluid Management System (FMS) Pond design for Closure Management Units (CMU) 4, 5, and 7.

ARC submitted the final combined OU-4b, 5 & 6 Field Sampling and Analysis Plan (FSAP).

April:
NDEP provided direction and comments to ARC regarding the Record of Decision (ROD) 1 Closure Management Unit (CMU) 4, 5, & 7 Fluid Management System (FMS) Ponds Draft Design Report. The final report is due to NDEP on June 1, 2019.

ARC submitted the 2018 Annual Domestic Well Monitoring Report and the 2018 Annual Groundwater Monitoring Report.

Public Meetings: 

NDEP’s June 2019 Public Meeting

NDEP held a public meeting in support of the ACMS on Tuesday, June 25, 2019. The meeting was from 4 to 6pm and was held in the Yerington Library.

NDEP would like to thank everyone that attended and appreciates their input.

The meeting was broken into two parts. The first part was a presentation and panel discussion on the mine closure construction schedule, groundwater investigation update, and proposed groundwater criteria. Attendee questions were accepted throughout the presentation and afterwards. The second part of the meeting was an informal poster presentation style meeting. Attendees could ask questions of presenters at their respective poster/video stations.

A copy of the presentation and the Draft Groundwater Criteria are below:
Presentation

Draft Criteria for Bottled Water Program Cessation, Domestic Well Monitoring Program Cessation, Groundwater Monitoring Well Optimization, and Groundwater Interim Actions

Downloadable posters for the meeting are below:
Poster are forthcoming

NDEP’s November 2018 Public Meeting

NDEP held a public meeting in support of the ACMS on Thursday, November 29, 2018. The meeting was from 4 to 6pm and was held in the Yerington High School gymnasium.

NDEP would like to thank everyone that attended and appreciates their input.

The format of the meeting was an informal Q&A session with three stations that allowed attendees to ask questions regarding the site. The three stations at the meeting focused on the following:

            Station 1- Community Involvement Plan, NDEP Anaconda Webpage, and Project Schedule

            Station 2- Phase 1 of the Project (capping and closure of the Arimetco heap leach pad system)

            Station 3- Groundwater plume stability study progress, bottled water service, and monitoring well sampling optimization

For those that attended and those that could not attend, please find copies of the posters NDEP had on display at the meeting below. All posters are downloadable.

Posters:
Station 1:
Please follow the provided hyperlink to the CIPP.

ACMS Operable Unit Map

ACMS Schedule 

Chart depicting the Anaconda 12-Year Closure Schedule
Click on schedule to enlarge

Station 2:
Phase 1 construction for ROD 1

Remedy Area

Conceptual drawings of how the closed heap leach pads will look

Conceptual Heap Leach Pad

Phase 1 Schedule

Phase 1 Schedule Poster

Station 3:
Map of Closure Phases

Map of Closure Phases

Groundwater Poster

Groundwater Map

Closure Schedule

Closure Schedule

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