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.
“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.
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.
“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.
“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.
International
U.S. Issues Urgent Evacuation Call for Citizens in Venezuela
The U.S. Department of State on Saturday urged American citizens currently in Venezuela to leave the country “immediately,” citing an increasingly unstable security situation.
In a security alert, the State Department warned of reports involving armed militia groups, known as colectivos, that have set up checkpoints and are stopping vehicles to search for evidence of U.S. citizenship or support for the United States.
The warning comes one week after U.S. forces captured Venezuela’s ousted president, Nicolás Maduro, and his wife, Cilia Flores, during a bombing operation in Caracas. Both were transferred to New York to face trial on narcotics trafficking charges.
U.S. authorities emphasized that the volatile security environment poses significant risks to American nationals and reiterated their long-standing advisory against travel to Venezuela.
International
U.S. strike in Caracas killed 32 cuban security officers, experts say surprise was crucial
Two days after a U.S. military attack on a military complex in Caracas, Havana confirmed that 32 members of its security forces were killed in the operation, some of whom were likely responsible for protecting Venezuelan leader Nicolás Maduro. The Venezuelan government also reported that 23 of its own military personnel died during the assault.
Of the Cuban dead, 21 belonged to the Ministry of the Interior, which oversees intelligence services, and 11 were from the Revolutionary Armed Forces. No official information has been released regarding potential injuries.
Experts consulted by AFP agreed that the element of surprise was the key to the success of the U.S. military operation, which was meticulously prepared over months and kept entirely secret. “Cuban intelligence … convinced the Maduro regime and its security agencies that the United States would never attack Venezuelan territory,” explained José Gustavo Arocha, a former Venezuelan army officer and expert at the Center for a Secure Free Society, a U.S. defense think tank.
Fulton Armstrong, a former U.S. intelligence officer and Latin America researcher at American University in Washington, also highlighted the failure to anticipate the attack and to detect U.S. helicopters entering Venezuelan airspace, noting that even a five- to ten-minute warning could have made a significant difference for the guards and for Maduro.
U.S. forces additionally benefited from “incredible” real-time intelligence provided by stealth drones to monitor movements of the Venezuelan leader, according to experts. A highly sophisticated combat team was deployed, and analysts believe the order to “fire to kill” was likely given.
Paul Hare, former British ambassador to Cuba and Venezuela, added that Cuban intelligence also underestimated the extent of U.S. access to internal cooperation within Venezuela’s security apparatus, contributing to the operation’s success.
International
Report: Vatican mediation included russian asylum offer ahead of Maduro’s capture
The Vatican reportedly attempted to negotiate an offer of asylum in Russia for Venezuelan President Nicolás Maduro before his capture by U.S. forces last Saturday, according to The Washington Post.
The U.S. newspaper reported that Vatican Secretary of State Cardinal Pietro Parolin spoke with U.S. Ambassador to the Holy See Brian Burch about a supposed Russian proposal to grant Maduro asylum. A source familiar with the offer said that what was proposed “was that he would leave and be able to enjoy his money,” and that part of the plan involved Russian President Vladimir Putin guaranteeing Maduro’s security.
Despite these diplomatic efforts, the United States carried out a military operation that resulted in Maduro’s capture and detention, along with his wife Cilia Flores, who are now being held in New York on narcoterrorism charges.
The Washington Post also noted that U.S. President Donald Trump may have invited Maduro to Washington for in-person discussions about safe conduct, an offer that Maduro reportedly declined.
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