Header photo credit: PODER


On August 6, 2014, over 10 million gallons of toxic mining waste spilled from the Buenavista del Cobre mine complex in Sonora, Mexico, operated by a subsidiary of Southern Copper Corp. The toxic waste spilled into a tributary of the Sonora River and ended up polluting nearly 120 miles of the river, affecting more than 24,000 people in seven communities. Mexico’s Environment Minister at the time, Juan Jose Guerra Abud, called it “the worst natural disaster provoked by the mining industry in the modern history of Mexico.”

Members of the affected communities filed multiple legal actions in Mexico, seeking information, community consultation, compensation, and requirements to ensure that any ongoing mining operations do not result in further damage. Several participants in these lawsuits then brought a Foreign Legal Assistance action in the United States against Southern Copper, which is incorporated in Delaware and headquartered in Arizona.

The Arizona federal court ordered Southern Copper to turn over all relevant documents located in the United States related to the spill.

Water from the Sonoran and Bacanuchi rivers is used by locals for agriculture and livestock. Photo credit: PODER
Alberto Salcido Romo,  Francisco Ramón Miranda, Francisca Garcia Enriquez,   and Oscar Ramírez Gamez, members of the affected communities in Sonora
Southern Copper Corporation
In addition to EarthRights International, the petitioners are represented by Christopher Benoit of the Law Office of Lynn Coyle in El Paso, Texas.
EarthRights filed this petition to obtain information to assist several Mexican environmental lawsuits. Southern Copper objected, arguing that the petitioners were trying to obtain documents from its Mexican subsidiaries, located in Mexico, and that the documents were not “for use” in the Mexican litigation because the cases at issue either had not been filed yet or were not in the proof-gathering stages. The court rejected these arguments, but did limit the discovery to the documents and testimony available in the United States. The court did not allow discovery of documents outside the United States.



On August 6, over 10 million gallons of copper sulfate spilled from the Buenavista del Cobre mine in Sonora, Mexico, operated by a Southern Copper Corporation subsidiary. Mexican Environment Minister Juan Jose Guerra Abud called this “the worst natural disaster provoked by the mining industry in the modern history of Mexico.” Construction defects in leaching ponds in part of the mine that was under construction were a direct cause of the spill.

In response, affected communities along the Sonora River formed the Sonora River Basin Committees.


The Committees filed six writ of amparo actions against various Mexican governmental entities as well as the mine owners and operators.


The Committees filed one more amparo action, and their lawyer prepared to file an environmental lawsuit to require the mine companies to restore the affected environment.

On April 11, EarthRights and co-counsel represented several members of the Committees in filing a Foreign Legal Assistance petition against Southern Copper Corporation in U.S. federal court in Arizona.

On June 10, the district court issued an order granting the petition, but “only to the extent it seeks materials that are readily accessible to SCC employees in the United States.” The court left open the possibility that this might include electronically stored documents that were accessible from terminals in the United States. Later, the court ruled that “‘readily accessible’ electronically stored documents include those sent, received, produced, opened or accessed by an SCC employee” in the United States. 

Under these parameters, very few documents were produced. The petitioners then filed a motion to compel additional documents.


In response to petitioners’ motion, the court ordered Southern Copper to provide a staff member for deposition who was responsible for preparing their response to the document requests. Petitioners deposed this employee in May, and after it became clear that he was not actually involved in preparing the company’s responses to the document requests, petitioners moved for sanctions.


In March, the court granted sanctions for Southern Copper’s conduct, and granted an additional deposition, but only “with regard to the information available in the United States.” Under those restrictions, petitioners opted not to pursue the deposition, and the case was closed.


Petitioners’ Application for Discovery
Exhibits Supporting Application for Discovery
Southern Copper’s Opposition to Application for Discovery
Petitioners’ Reply Supporting Application for Discovery
Declaration Supporting Reply
Court Order Granting Discovery