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

Spain rebukes U.S. over euthanasia case as minister defends legal framework

Spain’s Minister of Health, Mónica García, on Wednesday responded to the administration of U.S. President Donald Trump after reports that Washington requested an investigation into the euthanasia case of Spanish citizen Noelia Castillo.

The minister questioned the U.S. government’s stance and urged it not to interfere in matters governed by Spain’s legal and healthcare framework. “Stop fueling an international ultra agenda by meddling everywhere,” García wrote in a message on the social platform X.

In her remarks, García also criticized the U.S. healthcare system, noting that thousands of people die each year without access to medical coverage. She further accused the Trump administration of supporting actions that undermine human rights in international contexts.

García defended the legality of euthanasia in Spain, emphasizing that the procedure is strictly regulated and subject to medical and judicial oversight. “Spain is a serious country, with a strong healthcare system and a legal framework that protects individuals, including those who choose to seek assistance in dying under regulated conditions reviewed by clinical committees and upheld by the courts,” she said.

The case of Noelia Castillo, a 25-year-old woman living with paraplegia, drew widespread attention following a legal dispute with her father, who opposed her decision to undergo euthanasia. The procedure was ultimately carried out in accordance with Spanish law.

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International

New York City lifts TikTok ban on government devices under new security rules

New York City has lifted its ban on TikTok on government-owned devices, allowing city agencies to resume posting on the platform under newly established security protocols, Mayor Zohran Mamdani announced Tuesday.

The initial ban, implemented in 2023 by former mayor Eric Adams, aligned with federal and state-level restrictions across the United States, which limited the use of TikTok on official devices over concerns related to its parent company, ByteDance. The company has previously denied these concerns, calling them unfounded.

Under the updated guidelines issued by the city’s Cyber Command, devices designated for TikTok use by government agencies must not store or access sensitive information. Officials indicated that the policy shift is intended to enhance communication with residents.

“The Mamdani Administration is committed to using every tool in our toolbox to communicate with New Yorkers,” the mayor’s office said in a statement.

Following the announcement, the mayor’s official TikTok account resumed activity after remaining inactive since the ban was first enforced.

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International

Rubio signals possible engagement with Iranian factions amid internal divisions

U.S. Secretary of State Marco Rubio said Monday that Washington is hopeful of engaging with factions within the government of Iran, noting that the United States has received positive private signals.

Speaking to ABC News’ Good Morning America, Rubio suggested that internal divisions exist within the Islamic Republic and expressed confidence that figures with the authority to act could emerge.

“We are hopeful that this will be the case,” Rubio said. “Clearly, there are people there who are communicating with us in ways that those previously in power in Iran did not. This is reflected in some of the steps they appear willing to take.”

Despite this, Rubio maintained a firm stance toward Iran, reiterating that the ongoing conflict seeks to eliminate its capacity to develop nuclear weapons—an objective that President Donald Trump has previously claimed was achieved during a military strike last year.