A significant rise in global gold prices has catalysed an influx of illegal mining operations within Brazil’s Amazon rainforest, leading to alarming rates of deforestation in protected areas and an escalation in mercury pollution. This precarious situation, highlighted by recent research, underscores the urgent need for increased regulatory measures and enhanced protection for these vital ecosystems.
The Impact of Rising Gold Prices
The gold market has experienced unprecedented growth, largely attributed to a surge in investor interest amid global economic uncertainties. This increase has incentivised illegal mining activities, particularly in the Amazon region. A study conducted by Amazon Conservation in cooperation with the Instituto Socioambiental reveals that illegal mining operations have led to extensive deforestation within three key conservation zones in the Xingu area, which spans the Brazilian states of Pará and Mato Grosso. The study utilised satellite imagery alongside ground assessments to document the extensive environmental degradation occurring in these protected regions.
For instance, the Terra do Meio Ecological Station, which recorded instances of illegal mining as early as September 2024, saw its mining-related deforestation escalate to 30 hectares (approximately 74 acres) by the end of 2025. Similarly, the Altamira National Forest faced significant losses, with illegal mining accounting for 832 hectares (2,056 acres) of deforestation from 2016 to September 2025.
Escalating Environmental Concerns
The illegal mining activities not only contribute to deforestation but also pose severe threats to local ecosystems through mercury contamination. This toxic heavy metal, often used in the extraction process, finds its way into rivers and food sources, endangering both wildlife and human health. A clandestine airstrip used by illegal miners was detected within the Nascentes da Serra do Cachimbo Biological Reserve, highlighting the extent of these illicit operations, which expanded from 2 hectares (5 acres) to at least 26.8 hectares (66 acres) in 2025.
Since 2018, the Amazon Mining Watch platform, developed by Amazon Conservation in partnership with Earth Genome and the Pulitzer Center, has tracked mining-related deforestation across the Amazon basin. The data indicates that approximately 496,000 hectares (1,225,640 acres) of rainforest have been cleared for mining activities, with around 223,000 hectares (551,045 acres) located in the Brazilian Amazon. Alarmingly, an estimated 80 per cent of this mining-related deforestation is believed to occur illegally.
Challenges in Enforcement
While mining is not the primary driver of deforestation in Brazil—where agricultural expansion plays a more significant role—the rapid increase in illegal mining activities poses unique challenges for conservation efforts. In 2025, official reports indicated that roughly 579,600 hectares (1,432 acres) of the Brazilian Amazon were cleared, with a mere 17,000 hectares (42,000 acres) attributed to mining.
The Brazilian government has attempted to combat illegal mining, particularly in the Yanomami Indigenous territory, where a humanitarian crisis emerged due to rampant mining activities. Following a crackdown in 2023, the growth of newly mined areas significantly decreased. However, enforcement remains a continuous struggle, with illegal miners often resuming operations shortly after authorities depart. Federal prosecutor André Luiz Porreca described the situation as a “cat-and-mouse game,” highlighting the inadequacies in addressing this persistent issue.
The Human Cost of Inaction
The ramifications of illegal mining extend beyond environmental damage, threatening the health and livelihoods of local communities. Reports indicate that mercury contamination from illegal gold mining is widespread, with studies revealing that 21.3% of fish sold in public markets across the Amazon exceed mercury limits established by the World Health Organisation. Alarmingly, children aged 2 to 4 are consuming mercury at levels up to 31 times the recommended maximum.
Brazilian law prohibits mining on Indigenous lands, and the Ministry of Indigenous Peoples has prioritised the fight against illegal mining as part of President Luiz Inácio Lula da Silva’s administration. However, criminal networks that sustain these invasions pose significant challenges, necessitating a comprehensive approach to dismantle the economic structures that support illegal mining.
Why it Matters
The ongoing crisis of illegal mining in the Amazon underscores a critical intersection between environmental degradation and human health. As deforestation accelerates and mercury contamination rises, the potential for irreversible damage to one of the planet’s most vital ecosystems grows. The Amazon rainforest is not only crucial for biodiversity but also acts as a significant carbon sink, mitigating the impacts of climate change. Addressing these challenges requires urgent action from both national and international stakeholders to protect the Amazon’s integrity for future generations.
