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Posted on: November 18, 2021


Screenshot 2021-11-18 113454

ADEQ to conduct controlled takedown of Humboldt smelter smokestack.

The Arizona Department of Environmental Quality (ADEQ), in coordination with the Environmental Protection Agency (EPA), will be taking down the smelter smokestack and the remaining attached brick structure that has been naturally deteriorating over the years at the Iron King Mine-Humboldt Smelter Superfund site. 


Early 2022, ADEQ will disassemble both the smelter smokestack and the attached brick structure in a controlled fashion. To ensure the safety of the community and staff during the work of taking down the smelter smokestack and attached brick structure, ADEQ will implement safety measures that include site security, dust control and air quality monitoring. 


ADEQ will also install additional fencing within the smelter plateau and replace any dust-control cover previously installed by EPA (called Posi-Shell®) if affected by the project.


ADEQ is committed to keeping the community informed about this work and will give an initial presentation at the Town Council meeting on December 7, 2021. We expect the project work plan to be completed in December 2021, which we will post to a forthcoming dedicated web page. We will continue to provide community updates in the Town Newsletter and through letters to nearby residents.


EPA and ADEQ continue to advise people to avoid the smelter area and follow the posted warning signs. Please contact Barbara Boschert, ADEQ Community Involvement Coordinator, with questions about the smelter takedown project. Barbara can be reached via email at and by phone at (602) 292-0218.

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