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The recent spike in global gold prices has triggered an intense mining rush in Brazil’s Amazon rainforest, leading to alarming rates of deforestation and escalating mercury contamination, particularly in protected areas. A collaborative study from Amazon Conservation and Instituto Socioambiental reveals that illegal mining activities are wreaking havoc on conservation zones, threatening both the environment and the health of local communities.
Deforestation on the Rise
The study highlights how illegal mining operations have led to significant clear-cutting in three conservation areas within the Xingu region, spanning the states of Pará and Mato Grosso. With the aid of satellite imagery and on-the-ground research, the report documents the devastating impact of mining on these protected zones. Notably, the Terra do Meio Ecological Station, which recorded its first instances of illegal mining in September 2024, saw mining-related deforestation expand to 30 hectares (74 acres) by the end of 2025. Similarly, the Altamira National Forest suffered a loss of 832 hectares (2,056 acres) to illegal mining activities from 2016 until September 2025.
A new mining site that emerged in 2024 has already consumed 36 hectares (89 acres) by October 2025, accounting for nearly half of the mining-related deforestation in that area for the year. Surveillance data even uncovered a clandestine airstrip in the Nascentes da Serra do Cachimbo Biological Reserve, illustrating the audacity of illegal operations as they expanded from 2 hectares (5 acres) to at least 26.8 hectares (66 acres) in 2025.
The Scale of Illegal Mining
Since 2018, the Amazon Mining Watch platform, a joint initiative by Amazon Conservation, Earth Genome, and the Pulitzer Center, has tracked mining activities across the Amazon using satellite technology. The findings are stark: approximately 496,000 hectares (1,225,640 acres) of rainforest have been cleared for mining, with around 223,000 hectares (551,045 acres) in the Brazilian Amazon alone. Alarmingly, it is estimated that around 80 per cent of deforestation related to mining in Brazil occurs illegally.
While mining is a relatively minor contributor to overall deforestation in Brazil—where agriculture primarily drives forest loss—its impact on protected areas and Indigenous territories is particularly concerning. In 2025, the Brazilian Amazon saw a total of 579,600 hectares (1,432 acres) cleared, with only 17,000 hectares (42,000 acres) attributed to mining activities.
The Human and Environmental Toll
The ramifications of illegal mining extend beyond deforestation; they include severe mercury contamination in local waterways. Mercury, a byproduct of mining, poses grave health risks to riverine and Indigenous communities. A recent report submitted to the Inter-American Commission on Human Rights detailed widespread mercury pollution in the Amazon, with studies indicating that 21.3% of fish sold in local markets exceeded World Health Organization mercury limits. Alarmingly, children aged two to four were found to be exposed to mercury levels up to 31 times higher than recommended thresholds.
The Brazilian government has recognised the urgency of addressing illegal mining, especially on Indigenous lands, where such activities are explicitly prohibited. The Ministry of Indigenous Peoples has made combating this issue a priority under President Luiz Inácio Lula da Silva’s administration, stating that the challenge is compounded by well-organised criminal networks.
Enforcement Challenges Persist
Despite a notable crackdown on illegal mining in the Yanomami Indigenous territory in 2023, which aimed to alleviate a humanitarian crisis, the problem persists in other areas of the Amazon. Federal prosecutor André Luiz Porreca likens enforcement efforts to a “cat-and-mouse game,” where miners quickly return to their operations after authorities leave. His recent operations destroyed over 500 dredges on Indigenous land, only for miners to reappear shortly after.
Porreca also pointed out that the illegal mining trade is significantly funded by major criminal organisations, such as the Red Command and the First Capital Command, which are deeply entrenched in the Brazilian Amazon. This financial backing allows these operations to flourish, making it increasingly difficult for law enforcement to maintain control.
Why it Matters
The escalation of illegal mining in Brazil’s Amazon is not just an environmental crisis; it is a social and health emergency that threatens the delicate balance of this vital ecosystem. The rampant deforestation and mercury contamination endanger Indigenous communities and disrupt the broader climate regulation that the Amazon provides. As pressure mounts from both local and global stakeholders, addressing these challenges requires a concerted effort to strengthen enforcement mechanisms and combat the economic forces driving illegal mining. The future of the Amazon and its inhabitants hangs in the balance, demanding immediate and sustained action from both the Brazilian government and the international community.
