A significant rise in global gold prices has triggered a mining frenzy in Brazil’s Amazon rainforest, exacerbating deforestation in protected areas and leading to a critical increase in mercury contamination. This alarming situation has emerged as illegal mining operations wreak havoc on crucial conservation zones, igniting concerns among environmentalists and Indigenous communities alike.
Gold Rush Ignites Environmental Crisis
According to a recent study by Amazon Conservation, in collaboration with the Brazilian non-profit Instituto Socioambiental, illegal mining has resulted in extensive deforestation across three key conservation areas in the Xingu region. This area, which encompasses parts of the states of Pará and Mato Grosso, is one of the largest protected forest expanses globally. The study utilised satellite imagery alongside on-the-ground research to document the widespread destruction.
Notably, the Terra do Meio Ecological Station recorded its first illegal mining activities in September 2024. By the end of 2025, such operations had devastated approximately 30 hectares (74 acres) of forest. In the Altamira National Forest, illegal mining accounted for 832 hectares (2,056 acres) of deforestation from 2016 until September 2025, underscoring the rapid degradation of protected landscapes.
The Scale of Illegal Operations
A new mining front that emerged in 2024 has already expanded to cover 36 hectares (89 acres) by October 2025, representing nearly half of the illegal mining-related deforestation recorded that year. Moreover, clandestine airstrips used by illegal miners have been detected in the Nascentes da Serra do Cachimbo Biological Reserve, where mining activities surged from 2 hectares (5 acres) to at least 26.8 hectares (66 acres) in just one year.
Since 2018, the Amazon Mining Watch initiative—launched by Amazon Conservation in partnership with Earth Genome and the Pulitzer Center—has used satellite imagery to track mining activities across the Amazon. The findings reveal that about 496,000 hectares (1,225,640 acres) of rainforest have been cleared for mining, with approximately 223,000 hectares (551,045 acres) occurring in Brazil. Alarmingly, around 80 per cent of the deforestation linked to mining in Brazil is believed to happen illegally.
The Human and Ecological Toll
While mining constitutes a smaller portion of overall deforestation in Brazil—where agribusiness remains the leading cause—it is particularly damaging due to its impact on protected areas and Indigenous territories. In 2025 alone, the Brazilian Amazon saw approximately 579,600 hectares (1,432,000 acres) cleared, with around 17,000 hectares (42,000 acres) attributed to mining activities.
Matt Finer, director of Amazon Conservation’s Monitoring of the Andes Amazon programme, emphasised the severity of the situation: “What makes mining particularly problematic is that it targets protected areas and Indigenous territories.” Protecting these regions is essential to combat deforestation, as continued forest loss poses a significant threat to global climate stability.
Enforcement efforts against illegal mining often resemble a “cat-and-mouse game,” according to federal prosecutor André Luiz Porreca. Despite significant crackdowns—such as the one in the Yanomami Indigenous territory, which saw a dramatic reduction in mining-related deforestation—illegal operations persist. Porreca noted that after the destruction of over 500 dredges last year, miners quickly returned to the area, demonstrating the difficulties in maintaining long-term enforcement.
The Mercury Poisoning Crisis
The surge in gold prices, driven by heightened investor interest in safe assets amid global uncertainty, has significantly incentivised illegal mining. “It’s basic market logic. With more buyers, there are more people exploiting gold,” stated Porreca. The lax oversight of Brazil’s mineral export system has facilitated the laundering of illicit gold, allowing it to mask its illegality.
The repercussions of illegal mining extend beyond deforestation. Operations frequently release mercury into rivers, contaminating aquatic ecosystems and the communities that depend on them. A report submitted by Porreca to the Inter-American Commission on Human Rights highlighted alarming findings from a study by Fiocruz, revealing that 21.3% of fish sold in Amazonian markets exceeded World Health Organisation mercury limits. Alarmingly, children aged 2 to 4 were found to be consuming mercury at levels up to 31 times the recommended maximum.
Government Action and the Path Forward
Under existing Brazilian law, mining on Indigenous lands is strictly prohibited. The Ministry of Indigenous Peoples has stated that combating illegal mining is a priority for President Luiz Inácio Lula da Silva’s administration. However, the challenge remains daunting, as criminal networks sustain these invasions, necessitating comprehensive strategies to dismantle their economic and logistical support systems.
The Ministry of Environment has acknowledged the persistent threat of mercury contamination from illegal gold mining, pledging to enhance scientific monitoring and support enforcement initiatives. Despite these efforts, the Brazilian Federal Police has not provided further comment on the escalating situation.
Why it Matters
The ongoing gold rush in Brazil’s Amazon is not merely an environmental issue; it is a humanitarian crisis that threatens the health of Indigenous populations and the integrity of one of the planet’s most vital ecosystems. As illegal mining continues to proliferate unchecked, the global community must recognise the urgent need for coordinated action to protect the Amazon and its inhabitants. The stakes are high, and the time to act is now.
