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

Artemis II crew prepares for Earth return and splashdown recovery

Astronauts from the Artemis II mission are expected to be extracted from the Orion spacecraft approximately two hours after splashdown, scheduled for 20:07 UTC this Friday (6:07 p.m. in San Salvador), according to NASA.

Following recovery, a rescue team will transport the crew by aircraft to the USS John P. Murtha. Once onboard, they will undergo medical evaluations before boarding another flight to the Johnson Space Center.

On Thursday, NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, along with Canadian astronaut Jeremy Hansen from the Canadian Space Agency, continued preparations for their return to Earth.

Their activities include stowing equipment used during the mission, securing cargo and storage compartments, and installing and adjusting crew seats to ensure all items are properly fastened. The crew will also review the latest weather updates, recovery operations status, and reentry timeline, while preparing for post-landing procedures.

At 21:53 UTC (9:53 p.m. in San Salvador), Orion’s thrusters are scheduled to perform a second trajectory correction maneuver, refining the spacecraft’s path back to Earth. During this operation, Hansen will monitor guidance, navigation, and propulsion systems.

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NASA explained that during Friday’s reentry, the service module will separate about 20 minutes before Orion reaches the upper atmosphere southeast of Hawaii. If necessary, a final trajectory adjustment will fine-tune the flight path before the capsule begins a series of roll maneuvers to safely distance itself from jettisoned components.

Just before atmospheric interface, Orion will reach a peak speed of approximately 3,800 km/h. As it descends to about 400,000 feet (around 121.9 km), communications will be interrupted for approximately six minutes due to plasma formation around the capsule during peak heating.

NASA expects the crew to experience up to 3.9 G during a nominal reentry profile. After exiting the blackout phase, the capsule will jettison its forward bay cover. Drogue parachutes will deploy at around 22,000 feet (6.7 km), followed by the three main parachutes at approximately 6,000 feet (1.8 km).

Artemis II marks NASA’s first crewed flight test of the Space Launch System (SLS) rocket and Orion spacecraft around the Moon. The mission aims to validate capabilities for deep space human exploration and lay the groundwork for future long-term scientific missions on the lunar surface.

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International

Flooding in Dominican Republic leaves child dead and thousands affected

A two-year-old girl died after a wall of her home collapsed amid severe flooding that struck Dominican Republic on Wednesday. The heavy rains also caused power outages, school closures, and reduced working hours across affected areas.

Authorities issued preventive alerts in 15 of the country’s 31 provinces due to intense rainfall accompanied by thunderstorms that began Tuesday night.

Juan Méndez, director of the Center of Emergency Operations (COE), confirmed the child’s death to the press. The incident occurred in Santo Domingo Oeste, part of the capital region.

According to Red Cross officials, the girl died when a wall in her home collapsed following a landslide triggered by hours of heavy rain.

President Luis Abinader provided an update from the COE, stating that government agencies had been mobilized since early morning, particularly in Greater Santo Domingo, to protect lives and minimize material damage.

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Floodwaters left several vehicles submerged, while others were swept away by strong currents. Authorities estimate that around 250,000 families have been affected by the flooding.

Earlier, Public Administration Minister Sigmund Freund announced reduced working hours, encouraging remote work for those facing transportation difficulties, while maintaining in-person operations for essential services.

International

Bill Gates to testify before Congress over Epstein connections

Bill Gates is set to testify on June 10 before a congressional committee in United States investigating links connected to the late sex offender Jeffrey Epstein, a source familiar with the matter told AFP on Tuesday.

The Microsoft co-founder is among several high-profile figures named in documents released by the Department of Justice, which detail alleged close associations, questionable financial dealings, and private photographs involving Epstein.

According to a spokesperson cited by Politico, Gates “welcomes” the opportunity to appear before the committee. The representative emphasized that Gates “never attended or participated in any illegal activities with Epstein” and is prepared to answer questions to support the investigation.

The Bill & Melinda Gates Foundation did not immediately respond to AFP’s request for comment.

In late February, Gates told members of his foundation’s board that his association with Epstein was a “huge mistake.” He has consistently denied any involvement in the financier’s criminal activities. Epstein died by suicide in prison in 2019 while awaiting trial on charges of sex trafficking minors.

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“I did nothing illegal. I saw nothing illegal,” Gates said, according to a recording obtained by The Wall Street Journal.

Gates acknowledged that his relationship with Epstein began in 2011, three years after Epstein pleaded guilty to soliciting prostitution from a minor.

A draft email written by Epstein and released by the Department of Justice referenced alleged extramarital relationships involving Gates. The message, which was apparently never sent, claimed that Epstein had helped “Bill” obtain medication related to encounters with Russian women.

Gates admitted to having had two extramarital affairs but denied any involvement with Epstein’s victims.