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

US panel backs Trump-themed coin amid controversy

The United States Department of the Treasury confirmed to AFP that the Commission of Fine Arts approved the design of a new collectible coin featuring Donald Trump, with members of the commission appointed by the current administration.

According to the proposal, the coin will feature an image of Trump standing with clenched fists over a desk on the obverse, while the reverse will display an eagle, a traditional symbol of the United States.

The sale price of the collectible has not yet been disclosed, although the United States Mint typically offers similar items for more than $1,000.

“There is no more iconic portrait for the front of these coins than that of our president Donald Trump,” U.S. Treasurer Brandon Beach said in a statement sent to AFP. He added that two additional coins — a $1 piece and a one-ounce gold coin — are also under consideration.

However, the Citizens Coinage Advisory Committee (CCAC), another body responsible for reviewing new coin proposals, declined to discuss the Trump design in late February.

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“Only nations governed by kings or dictators place the image of a sitting leader on their currency,” said Donald Scarinciat the time. “No country in the world has minted coins featuring a democratically elected leader during their term in office,” he added.

When contacted by AFP, the Treasury Department did not immediately respond to requests for further comment.

International

Fed’s Waller warns of rising inflation risks amid Middle East conflict

Christopher Waller, a governor at the Federal Reserve, said Friday that he is increasingly concerned about the inflationary impact of the ongoing conflict involving United States and Israel against Iran, particularly due to the prolonged closure of the Strait of Hormuz.

Waller, who had supported interest rate cuts over the past year amid concerns about the labor market, said he has shifted his stance in recent weeks due to rising inflation risks.

“Since the Strait of Hormuz was closed, it suggests this conflict could be much more prolonged and that oil prices will remain elevated for longer,” Waller said in an interview with CNBC.

“Therefore, this indicates that inflation is a greater concern than I had previously assessed,” he added.

Waller also backed the Federal Reserve’s decision earlier this week to keep interest rates unchanged, signaling a more cautious approach as global geopolitical tensions continue to affect economic outlooks.

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International

Brazil offers to mediate Colombia-Ecuador tensions, calls for restraint

The government of Brazil has offered to mediate in the ongoing tensions between Colombia and Ecuador, while calling on both nations to exercise restraint.

In a statement released Wednesday, Brazil’s Ministry of Foreign Affairs urged the parties involved to act with moderation and seek a peaceful resolution to the dispute.

“Brazil encourages all sides to act with moderation in order to find a peaceful solution to the controversy. It stands ready to support dialogue efforts aimed at preserving peace and security in the region,” the statement said.

Brazil also expressed “serious concern” over reports of deaths in the border area between Colombia and Ecuador, noting that the circumstances surrounding the incidents have not yet been clarified.

The diplomatic move comes amid rising tensions between the neighboring countries, increasing regional concern over stability and security along their shared border.