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Scientists attempt to prove link between Amazon Gold Mining and disability in babies

Indigenous women in the Amazon say they are afraid of getting pregnant. The rivers that were once the lifeblood for their people are now contaminated with mercury due to illegal gold mining. This poses a threat to the unborn children.

Alessandra Korap, a leader from the Munduruku tribe, said that "breast milk is no more reliable."

The family of Rany Ketlen, aged three, lives in Sai Cinza a Munduruku village surrounded by illegal mining. They struggle to understand why Rany is unable to lift her head or suffer from muscle spasms.

Scientists could have an answer soon. Rany is among at least 36 children in the area who have neurological disorders that cannot be explained by genetic testing, according to the preliminary results of a study on the effects of mercury contamination.

Scientists have warned about the dangers that mercury poses to Indigenous children living in the Amazon. However, no study has established a causal relationship between disabilities and these communities. This study could soon establish this link.

Eat the fish poisoned by mercury or go hungry. Rosielton Saw is Rany's dad. He has been a miner in their village, following his father Rosenildo, for many years.

The older man, sitting in the one-bedroom wooden house of the family, said that he was aware that the mercury the family used was harmful.

Rosenildo Saw stated that mining 30 grams of gold a week is "enough" to sustain oneself.

Surubim is a carnivorous, mercury-accumulating fish. The family eats it regularly. Rany Ketlen drinks the broth because she has severe swallowing issues.

Recently, health officials from the government have reported that dozens of patients in other parts of the region suffer from similar disorders. A lack of testing and medical care have made it difficult to get a complete picture of the issue or determine the exact cause.

Researchers are now collecting data about neurological disorders that have been linked to mercury poisoning. These range from acute brain malformations to memory problems, and will be concluded by 2026. Scientists involved in this latest, unpublished study, supported by Brazil's top public health institute, say that the main suspect is mercury, which seeps into waterways from miners who use it to bind the tiny specks gold they extract from riverbanks. This is a largely illegal trade fueled by record high prices for precious metal.

Mercury has contaminated the river fish, a staple of Indigenous communities, and it has accumulated at alarmingly large levels in placentas and breast milk, as well as offspring, and is often more than twice or three times higher than the threshold that pregnant women should be concerned about.

Zildomar Munuruku, chief of Zildomar and also a nurse said that despite the advice from health officials, he could not tell his people to stop consuming fish.

He said, "If we follow their rules we will starve."

MERCURY WILL LINGER EVEN IF MINING STOPS. Next month, world leaders and diplomats will gather in the Amazon to attend the United Nations Climate Summit, also known as COP30. The Brazilian organizers called it "Forest COP" to focus global attention on threats facing tropical rainforests, their inhabitants and illegal mining in the region.

Since he took office again in 2023, Brazilian President Luiz-Inacio Lula Da Silva has forced thousands of Indigenous miners from their lands. Mercury is not broken down by air, water or soil. This causes a long-lasting health crisis.

The Health Ministry released a statement saying that the Brazilian government had increased monitoring of mercury levels within the Munduruku Indigenous Territory. It also trained public health officials on how to recognize early signs of Mercury poisoning.

Paulo Basta is a researcher with the public health institute Fiocruz who has been studying mercury contamination in Indigenous peoples for over three decades.

The new data, papers and interviews reviewed by indicate that the humanitarian crisis caused by illegal mining in the Amazon will have lasting consequences for the current and future generations. In a 2021 study, Basta and colleagues found that 10 out of 15 mothers in three Munduruku village villages tested had high mercury levels. In a previous study, 12 out of 13 Yanomami villagers where mining was prevalent had dangerous levels of mercury in their bloodstream. Basta's team collected nearly all 546 cases registered in the government databases as of March 2025.

Basta stated, "That is just the tip." Tens of thousands people live in the Munduruku Yanomami and Kayapo territory.

It is not easy to prove causation.

Basta's research team is currently working on a study that will provide the missing piece of the puzzle: proof showing mercury causes disabilities. They are testing babies in their first year of life by following 176 women during pregnancy.

The researchers' preliminary findings showed that in Sai Cinza where Rany Ketlen lives with her family, mercury levels were five times higher on average for mothers than what the Brazilian Health Ministry considers to be safe, and three times as high for babies. Raylene Ketlen, Rany's one-year old sister, is among them. She has yet to show any symptoms.

Cleidiane Carrvalho is a nurse and a former researcher who has spent years trying to link researchers with sick Indigenous children. She was worried that without their studies, the crisis would be "silenced and neglected forever."

It has been difficult to prove a causal connection between mercury contamination and health problems.

Researchers at Fiocruz found that Indigenous communities are often lacking in basic health care and vulnerable to infectious diseases. These can all cause neurological disorders. In small Indigenous communities, marriages between close cousins are more common, and can lead to genetic disorders.

The 36 patients without inherited genetic disorders are likely to have mercury poisoning, but this does not exclude other causes, according to Fernando Kok, geneticist and Fiocruz researcher at the University of Sao Paulo.

The tests that detect mercury in the body are only snapshots of what a person ate recently, and cannot be used to prove a previous contamination as a source of neurological issues.

Kok stated, "It is a perfect crime because it leaves no sign." (Reporting and editing by Brad Haynes, Claudia Parsons and Adriano Machado; reporting by Ricardo Brito and Manuela Andreoni)

(source: Reuters)