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
Singer seriously injured after knife attack in Tokyo’s Akasaka District
A woman in her forties was stabbed on Sunday by a man in Tokyo’s busy Akasaka district, leaving her with serious injuries, according to local media reports.
At around 10:25 a.m. (local time), police received an emergency call reporting that a woman was bleeding after being attacked with a knife by a man wearing a black hood in the basement of a building in Akasaka, police sources told Kyodo News.
The woman sustained severe injuries to her abdomen and hand but was conscious when she was transported to a hospital, Tokyo Metropolitan Police said, adding that the suspected assailant fled the scene with what appeared to be a knife.
The victim, believed to be a singer, was reportedly attacked while waiting alone outside a live music club where she was scheduled to perform.
Police stated that they are searching for the suspect and noted that the woman did not know him.
International
Ombudsman confirms deaths of six minors in bombing targeting FARC dissidents
Colombia’s Ombudsman’s Office reported on Saturday the deaths of six minors who had been recruited by guerrilla groups, killed during the deadliest airstrike ordered by President Gustavo Petro in an Amazonian region in the south of the country.
Amid pre-election criticism and pressure from the United States demanding stronger action against drug trafficking, Petro has intensified military operations against armed groups. Over the past week, a series of bombings have left 28 people dead.
The minors were killed in an airstrike announced on Tuesday against a camp belonging to dissident factions of the now-defunct FARC guerrilla in the department of Guaviare, resulting in 19 deaths—the largest operation of its kind under Petro’s administration.
“This is all deeply regrettable; it is war in its most painful and inhumane expression, harming the most vulnerable—minors recruited due to lack of protection and now turned into military targets,” said Ombudswoman Iris Marín in an audio message sent to the press, confirming the deaths of six minors without providing their ages.
Marín held the guerrilla group led by the country’s most-wanted man, alias Iván Mordisco, responsible for recruiting the children.
However, she also stressed that “the military forces must take every feasible precaution to protect children,” in accordance with international principles that require “careful evaluation of the means and methods of warfare to avoid disproportionate or unnecessary harm.”
International
Colombia reaches $4.5 billion deal to acquire 17 Gripen Fighter Jets from Saab
The Colombian government has finalized a negotiation agreement with the Swedish company Saab for the purchase of 17 SAP-39 Gripen fighter jets, valued at more than $4.5 billion, according to local media reports.
Colombian outlets indicated that payments are scheduled to begin in 2026, starting with an initial installment of 100 billion Colombian pesos. However, the aircraft will be delivered between 2027 and 2032, when the final jet is expected to arrive in Colombia.
This new contract represents the second-largest public purchase made by Colombia so far this century, surpassed only by the investment in the Bogotá metro system, local media noted.
The agreement is expected to be officially signed during the ceremony commemorating the 216th anniversary of the Colombian Aerospace Force, to be held in Cali on November 14 of this year.
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