A notable rise in global gold prices has triggered a new wave of illicit mining activities in Brazil’s Amazon, exacerbating deforestation in protected regions and leading to alarming levels of mercury pollution. This troubling trend, highlighted by recent studies, underscores the urgent need for effective regulatory measures to protect vital ecosystems and Indigenous communities.
Mining Rush Driven by Gold Prices
The current boom in gold prices, primarily driven by investors seeking safe assets amid global uncertainties, has led to a resurgence of illegal mining within the Amazon rainforest. According to a study released by the non-governmental organisation Amazon Conservation in collaboration with Instituto Socioambiental, extensive illegal mining activities have resulted in significant deforestation across three conservation zones in the Xingu region. This area, which spans parts of Para and Mato Grosso, is one of the largest protected forest expanses in the world.
Satellite imagery combined with ground research has revealed the stark reality of the destruction. For example, the Terra do Meio Ecological Station reported its first instances of illegal mining in September 2024. By the end of 2025, mining-related deforestation had already affected 30 hectares (approximately 74 acres) of this conservation area. In a similar vein, the Altamira National Forest has suffered 832 hectares (2,056 acres) of deforestation linked to illegal mining since 2016.
The Environmental Impact of Illegal Mining
The consequences of this mining surge are severe, with the newly identified mining front in 2024 expanding to 36 hectares (89 acres) by October 2025. This accounted for nearly half of the mining-related deforestation witnessed that year. Additionally, clandestine airstrips for illegal miners have been discovered in reserves, such as the Nascentes da Serra do Cachimbo Biological Reserve, where illegal mining operations grew from 2 hectares (5 acres) to at least 26.8 hectares (66 acres) in 2025.
A collaborative initiative, the Amazon Mining Watch, was established in 2023 to monitor mining activities using satellite imagery. Since its inception, it has documented the clearing of approximately 496,000 hectares (1,225,640 acres) of rainforest for mining purposes, with an estimated 223,000 hectares (551,045 acres) occurring in Brazil. Alarmingly, around 80 per cent of this deforestation is believed to occur illegally, a fact that raises significant environmental concerns.
Enforcement Challenges and Criminal Networks
While illegal mining constitutes a relatively small fraction of overall deforestation in Brazil—where agribusiness is the primary driver—its impact on protected areas and Indigenous territories is particularly troubling. In 2025, official data indicated that about 579,600 hectares (1,432 acres) of the Brazilian Amazon were cleared, with mining responsible for approximately 17,000 hectares (42,000 acres).
The Brazilian government has attempted to combat illegal mining, notably through crackdowns in the Yanomami Indigenous territory, which faced a humanitarian crisis due to mining activities. Although there was a marked reduction in new mining areas, enforcement remains inconsistent. Federal prosecutor André Luiz Porreca described the situation as a “cat-and-mouse game,” where miners quickly resume operations after enforcement actions.
Additionally, illegal gold mining is closely tied to Brazil’s major criminal organisations, which finance these operations. Porreca highlighted the involvement of groups like the Red Command and the First Capital Command, which have the resources to support extensive mining activities.
Mercury Contamination and Health Risks
Beyond deforestation, illegal mining poses severe health risks through mercury pollution. Mining operations often release mercury into water systems, contaminating fish and posing dangers to local communities. A report submitted to the Inter-American Commission on Human Rights cited alarming findings from Fiocruz, a state-run research institution. It revealed that 21.3% of fish sold in Amazonian markets exceeded World Health Organisation mercury limits, with children aged 2 to 4 consuming mercury at levels up to 31 times higher than recommended.
The Brazilian Ministry of Indigenous Peoples has prioritised the fight against illegal mining on Indigenous lands, acknowledging the challenges posed by entrenched criminal networks. Meanwhile, the Ministry of Environment continues to expand scientific monitoring and enforcement efforts to address mercury contamination.
Why it Matters
The current surge in illegal gold mining in the Amazon is not merely an environmental issue; it poses an existential threat to Indigenous communities and the integrity of one of the world’s most critical ecosystems. As deforestation accelerates and mercury pollution spreads, the long-term implications for biodiversity, climate regulation, and human health could be catastrophic. Addressing this crisis requires immediate, concerted action from authorities, environmental organisations, and the international community to protect the Amazon and its inhabitants from irreversible damage.
