International

Chilean scientist plans to clean up mining with ‘metal eating’ bacteria

AFP

Starving microorganisms capable of surviving in extreme conditions have already managed to “eat” a nail in just three days.

In Chile, a scientist is testing “metal-eating” bacteria she hopes could help clean up the country’s highly-polluting mining industry.

In her laboratory in Antofagasta, an industrial town 1,100-kilometers north of Santiago, 33-year-old biotechnologist Nadac Reales has been carrying out tests with extremophiles — organisms that live in extreme environments.

Reales came up with her idea while still at university as she was conducting tests at a mining plant using microorganisms to improve the extraction of copper.

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“I realized there were various needs in the mining industry, for example what happened with the metallic waste,” she told AFP.

Some metals can be recycled in smelting plants but others, such as HGV truck hoppers that can hold 50 tons of rock, cannot and are often discarded in Chile’s Atacama desert, home to the majority of the country’s mining industry.

Chile is the world’s largest producer of copper, which accounts for up to 15 percent of the country’s GDP, resulting in a lot of mining waste that pollutes the environment.

In her research, Reales, who now runs her own company Rudanac Biotec, concentrated on iron-oxidizing bacteria called Leptospirillum.

She extracted the bacteria from the Tatio geysers located 4,200 meters above sea level, some 350 kilometers from Antofagasta.

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The bacteria “live in an acidic environment that is practically unaffected by relatively high concentrations of most metals,” she said.

“At first the bacteria took two months to disintegrate a nail.”

But when starved, they had to adapt and find a way of feeding themselves.

After two years of trials, the result was a marked increase in the speed at which the bacteria “ate,” devouring a nail in just three days.

– Surprising benefit –

Reales says “chemical and microbiological tests” have proved the bacteria are not harmful to humans or the environment.

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“We’ve always seen a lot of potential in this project that has already passed an important test in the laboratory,” said Drina Vejar, a microbiologist who is part of a four-person team working with Reales.

“It’s really necessary at this time when we have to plan for a more sustainable development, especially in all these cities with so many polluting industries.”

Mining companies have shown interest in the research but while Rudanac Biotec previously benefitted from a state fund for start-ups, the company needs investment to move on to its next stage of trials.

Reales says she needs money to see if her method will “eat a medium sized beam or a hopper.”

When the disintegration process is complete, what remains is a reddish liquid residue, a solution known as a lixiviant that itself possesses a surprising quality.

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“After biodisintegration the product generated (the liquid) can improve the recovery of copper in a process called hydrometallurgy,” said Reales.

Essentially, the liquid residue can be used to extract copper from rock in a more sustainable manner than the current use of chemicals in leaching.

Reales says it means green mining is “totally feasible.”

That is of great interest to mining companies that could use it to improve their large scale extraction of copper or other minerals, while also reducing their pollution, something they are required to do by law.

Reales recently submitted a request for an international patent for her technology, but more importantly she hopes it will help reduce metal waste blotting the landscape in the mining regions of her country.

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International

Exclusive Tucson Neighborhood Shaken by Disappearance of Savannah Guthrie’s Mother

The disappearance of Nancy Guthrie, mother of well-known U.S. journalist Savannah Guthrie, has shaken the exclusive Catalina Foothills neighborhood in northern Tucson, Arizona. For the past eleven days, the area has become the focus of an intensive investigation and constant media attention.

The 84-year-old woman was last seen on January 31, when she returned home after a family dinner. Since then, authorities have released few details about the suspected abduction.

“It is worrying that an elderly person could be the victim of a crime like this in her own home; we are a community of retirees,” Mario Ruiz, a resident who lives near the property, told EFE.

He explained that neighbors in the area tend to respect each other’s privacy, and many homes do not even have fences, surrounded only by the desert landscape about 110 kilometers from the Mexican border.

Support for the family is visible in an improvised altar set up outside Guthrie’s house. Flowers, candles and a message written on a stone — “Please pray, bring her home” — reflect the concern felt by the community.

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During a visit to Catalina Foothills on Wednesday, a strong presence of FBI agents could be seen patrolling nearby roads and neighborhoods in search of any clue that might help locate Guthrie.

Officers have been checking bushes, trash containers and surrounding areas near the residence, which is located in one of Tucson’s most exclusive districts, close to shopping centers, private golf courses and resorts.

International

Over 50 Civil Groups Urge House to Impeach DHS Secretary Kristi Noem

More than 50 civil society organizations, including Latino collectives and migrant advocacy groups, on Tuesday urged the U.S. House of Representatives to open impeachment proceedings against Homeland Security Secretary Kristi Noem, whom they accuse of leading a migration policy that is “violent, reckless, and contrary to the Constitution.”

The request was submitted through a letter sent to House Speaker Mike Johnson and other legislative leaders. In the document, the organizations argue that Noem has encouraged repressive practices that have left multiple victims and have “intentionally undermined the mission of the Department of Homeland Security (DHS).”

Among the signatories are Voto Latino, Freedom for Immigrants (FFI), Hispanic Federation, UnidosUS, and the Latino Victory Project. The groups emphasized that at least 187 lawmakers already support the impeachment initiative introduced in January by Representative Robin Kelly for alleged “high crimes and misdemeanors.”

The accusations include the alleged obstruction of congressional access to migrant detention centers and the excessive use of force, with at least 14 people shot since July 2025. They also cite three documented deaths, including those of U.S. citizens Renee Good and Alex Pretti.

The organizations further criticized the detention of migrant children, pointing to the case of five-year-old Liam Conejo Ramos, arrested in Minnesota last month, which sparked nationwide controversy.

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They also denounced that operations carried out by Immigration and Customs Enforcement (ICE) have resulted in due process violations, unlawful detentions of Indigenous citizens, and disregard for court orders. According to the signatories, Noem has “dismantled” civil rights protections within the DHS and has shown a lack of understanding of constitutional principles such as habeas corpus.

Central America

Guatemala to Phase Out Longstanding Medical Cooperation Agreement with Cuba

Guatemala’s government announced on Tuesday that it will end this year a cooperation agreement with Cuba that has brought doctors from the Caribbean nation to work in the Central American country.

Guatemala’s Health Ministry told EFE that the program, which has been in place for nearly three decades, will be phased out progressively throughout 2026.

According to the same source, there are currently 412 Cubans in Guatemala under the agreement, including 333 physicians.

Cuban medical brigades assigned to Guatemala have traditionally been deployed to various regions of the country to provide primary health care to local communities.

“The decision follows a technical assessment aimed at strengthening the sustainability of the national workforce and consolidating the public health system’s own capacities,” the Guatemalan ministry said.

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Earlier this week, lawmaker Sonia Gutiérrez, from the left-wing Winaq party, warned that the move “could be an inhumane act that threatens the health and lives of the country’s most vulnerable populations,” given the historic importance of Cuban doctors in providing medical care.

For that reason, the legislator summoned Health Ministry authorities to Congress, as permitted by law, to provide further details about the decision.

Former human rights ombudsman Jordán Rodas Andrade also weighed in on social media, recalling that “for 27 years Cuban doctors have been the backbone of health care in Guatemala’s most neglected areas,” and stressing that “ending this agreement is an act of ingratitude that leaves the most vulnerable unprotected.”

President Bernardo Arévalo’s government told EFE that, in order to guarantee continued care, it will implement a gradual replacement plan that includes hiring national personnel.