Phelps Dodge Industrial Mining Complex

State TrusteeState of Arizona
AO Bureau

Also Known As

Incident Type




Case Status



1 site in AZ, 3 sites in NM


Contaminants of Concern Include

Affected DOI Resources Include

Migratory Birds

Financial Summary

Restoration Funds Collected:


*Restoration Funds Allocated:


*Restoration Funds Remaining:


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Case Description

This site addressed combination of multiple copper mining sites within southwestern New Mexico and southeastern Arizona, including the Chino, Tyrone and Cobre mines in New Mexico, and the Morenci Mine in Arizona. These open pit mines were mined in the late 1870 through 1900s. Hazardous substances released at the Sites include sulfuric acid and metals/metalloids, including arsenic, beryllium, cadmium, chromium, cobalt, copper, lead, manganese, mercury, nickel, selenium, and zinc. The primary sources of hazardous substances at the Sites include mine wastes, including tailings, waste rock, and spent ore leach piles, ore and leach stockpiles; mine waters, including pregnant leach solution, raffinate, tailings supernatant water,seepage from wastes and mined materials, and stormwater that contacts mine wastes. In 2011, rainwater ponded on leach piles that had been treated with sulfuric acid. These ponds then became acidic and injured migrating birds that stopped over in this desert area to rest.

Case Documents

 Document TypeDocument NameDocument Date

Assessment;Case Funding

 PAS Preassessment Screen and Determination 06/18/2003


 Complaint Complaint 04/23/2012
 Consent Decree Consent Decree-Freeport-McMoRan 02/21/2012
 Consent Decree Consent Decree-Morenci-McMoRan 06/28/2012


 Restoration Plan Groundwater Restoration Plan 01/04/2012
 Restoration Plan and Environmental Assessment Wildlife and Wildlife Habitat 10/01/2013

Map View

Case Contact

Arizona Ecological Services Field Office

Phoenix, AZ | (602) 242-0210 |

Case Trustees

AO Bureau
State TrusteeState of Arizona

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