Report: New Tailings Dam Poses Threat To Sonora River Valley More Than 5 Years After Major Spill

By Kendal Blust
Published: Thursday, December 12, 2019 - 5:58pm
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A view of the Rio Sonora valley from a hillside in the town of Baviácora, Sonora, on July 30, 2019.

In August 2014, Mexico’s largest mining company, Grupo México, spilled nearly 11 million gallons copper sulfate acid solution carrying heavy metals from the Buenavista copper mine into the Bacanuchi and Sonora rivers. An estimated 25,000 people living in seven communities along downstream of the mine in the Rio Sonora valley were impacted by the spill.

Now the report “La Nueva Amenaza De Grupo Mexico” says the new tailings pond poses yet another risk to residents who say there still hasn’t been an effective response to the 2014 disaster.

“There has yet to be an effective remediation from the 2014 spill, and now we have the new tailings dam. That’s why it’s ‘Grupo México’s New Threat.’” said Claudia Ocaranza, who wrote the report with the nonprofit PODER, which also released additional reports on the mining company this week. “Grupo México’s new threat is the tailings dam.”

Ocaranza said the dam is already being filled with contaminants, though it’s unclear if construction is complete. Mexican environmental authorities conducted an investigation into the new dam earlier this year, but a report has yet to be released.

In her report, Ocaranza details a variety of issues with the construction of the new dam. But for residents of the Rio Sonora valley, she said, the main concern is having access to safe water.

“You have to put yourself in the situation of people living in the Rio Sonora. The river is their way of life. They rely on that water for their livelihoods, their health, their economy," she said. “We would like to see authorities keep the promises they’ve made, and to finally see an effective remediation for people who haven’t lived a normal life for five years. Because that’s the problem. They don’t have a normal life. The spill carried that away.”

In the wake of the report’s release, Mexican President Andrés Manuel López Obrador responded to questions from Ocaranza on Wednesday by promising justice for communities in the Rio Sonora valley and asking Environmental Secretary Victor Toledo to address the issue during a press conference the next morning.

In his remarks, Toledo said he would meet with officials in Hermosillo next week to address health issues in the affected towns. And Mexico's Environmental Prosecutor Blanca Mendoza also suggested that Grupo México could still be on the line millions of dollars owed to a fund set up for victims of the 2014 spill.

Mexican journalist Milton Martínez also published an unrelated report Wednesday about a second, smaller Buenavista copper mine spill in 2014 that authorities allegedly hid from the public.

Fronteras Sonora