Superfund Information Systems: Site Profile

Superfund Site:

IRON KING MINE - HUMBOLDT SMELTER
DEWEY-HUMBOLDT, AZ

Cleanup Progress

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Cleaning up Superfund sites is a complex, multi-phase process. Learn more:

Site Milestones

Milestone Date(s)
Initial Assessment Completed 09/28/1998
Proposed to the National Priorities List 03/19/2008
Finalized on the National Priorities List 09/03/2008
Remedial Investigation Started 06/19/2008
Remedy Selected Estimated Mar - May 2021
Remedial Action Started Not Yet Achieved
Construction Completed Not Yet Achieved
Deleted from National Priorities List Not Yet Achieved
Most Recent Five-Year Review Not Yet Achieved
Site Ready for Reuse and Redevelopment Not Yet Achieved

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Cleanup Schedule by Operable Unit

During cleanup, a site can be divided into a number of distinct areas depending on its complexity. These areas, called operable units (OUs), may address geographic areas, specific problems, or areas where a specific action is required. Examples of typical operable units include construction of a groundwater pump and treatment system or construction of a cap over a landfill.

Milestone OU Start Date Completion Date OU ID
Administrative Order of Consent (EPA Performed) OU 00 - SITEWIDE 05/12/2006 00
Removal (PRP Performed, EPA Oversight) OU 00 - SITEWIDE 07/24/2006 05/14/2007 00
Removal (EPA Performed) OU 01 - OPERABLE UNIT 001 08/29/2011 03/13/2013 01
Removal (EPA Performed) OU 01 - OPERABLE UNIT 001 04/17/2017 07/03/2017 01
Removal OU 01 - OPERABLE UNIT 001 Estimated Sep - Nov 2019 Estimated Sep - Nov 2020 01
Remedial Investigation (EPA Performed) OU 01 - OPERABLE UNIT 001 06/19/2008 09/20/2016 01
Feasibility Study (EPA Performed) OU 01 - OPERABLE UNIT 001 01/12/2009 Estimated Mar - May 2021 01
Proposed Plan OU 01 - OPERABLE UNIT 001 Estimated Jul - Sep 2020 Estimated Sep - Nov 2020 01
Record of Decision OU 01 - OPERABLE UNIT 001 Estimated Mar - May 2021 01
Remedial Design OU 01 - OPERABLE UNIT 001 Estimated Dec 2021 - Feb 2022 01

NOTE: Dates and estimated dates will not display for all milestones. Estimated dates only display for milestones planned within the next three fiscal years. Estimated dates and start dates will not display for the following enforcement milestones: Administrative Order of Consent, Consent Decree and Unilateral Administrative Order. Start dates will not display for the following document milestones: Five-Year Review, Record of Decision, Record of Decision Amendment, Explanation of Significant Differences and Partial NPL Deletion.

DISCLAIMER: The data on this page are derived from the Superfund Enterprise Management System and are solely for informational purposes. The data cannot be relied upon to create any substantive or procedural rights or requirements enforceable by any party in litigation with any member of the public, states, tribes, the United States or any federal agency. EPA reserves the right to change these data at any time without public notice.

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