A dramatic surge in global gold prices has ignited an illicit mining frenzy within Brazil’s Amazon rainforest, resulting in alarming rates of deforestation and hazardous mercury pollution in environmentally protected areas. Recent findings reveal that illegal mining activities are not only decimating vast stretches of rainforest but are also jeopardising the health of local communities through toxic contamination.
Rising Gold Prices Trigger Mining Surge
The escalating value of gold, primarily driven by investor demand for secure assets amid global uncertainties, has created a lucrative incentive for illegal mining operations in Brazil’s Amazon. A comprehensive study conducted by Amazon Conservation in collaboration with the Instituto Socioambiental has documented extensive deforestation linked to these unlawful activities, particularly within conservation zones in the Xingu region, which spans the states of Pará and Mato Grosso.
The research employed satellite imagery in conjunction with on-ground investigations to provide a stark visual representation of the destruction. For instance, the Terra do Meio Ecological Station noted the onset of illegal mining activities in September 2024, which expanded to encompass 30 hectares (74 acres) by the end of 2025. Similarly, the Altamira National Forest witnessed a staggering loss of 832 hectares (2,056 acres) due to illegal mining from 2016 to September 2025.
Documented Environmental Damage
New mining fronts have emerged rapidly, with one such area expanding to 36 hectares (89 acres) by October 2025. This accounted for nearly half of the mining-related deforestation observed in that particular zone throughout the year. Satellite monitoring has also revealed the existence of clandestine airstrips established for illegal miners within the Nascentes da Serra do Cachimbo Biological Reserve, where mining operations have increased from 2 hectares (5 acres) to at least 26.8 hectares (66 acres) over the past year.
The Amazon Mining Watch platform, developed through a partnership between Amazon Conservation, Earth Genome, and the Pulitzer Center, has been instrumental in tracking mining activities since 2018. The findings are alarming: 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. Notably, it is estimated that 80% of deforestation caused by mining in Brazil is likely illegal.
Enforcement Challenges and Criminal Networks
While mining constitutes a relatively minor contributor to overall deforestation in Brazil—where agribusiness is the primary driver—its impact is particularly devastating due to its targeting of protected areas and Indigenous territories. In 2025, Brazil cleared approximately 579,600 hectares (1,432 acres) of rainforest, with about 17,000 hectares (42,000 acres) attributed to mining, as reported by the Mining Watch.
The Brazilian government has made efforts to combat illegal mining, particularly in the Yanomami Indigenous territory, which experienced a severe humanitarian crisis due to mining activities. Following a crackdown in 2023, there was a significant reduction in new mining areas; however, enforcement remains inconsistent. Federal prosecutor André Luiz Porreca described the situation as a “cat-and-mouse game,” where illegal miners swiftly return to operations following enforcement actions.
The Human Cost of Mercury Contamination
The ramifications of illegal mining extend beyond deforestation. The practice involves the indiscriminate dumping of mercury into local waterways, leading to severe contamination that poses serious health risks to Indigenous and riverine communities. A report submitted to the Inter-American Commission on Human Rights by Porreca highlighted that over 21% of fish sold in public markets across the Amazon exceeded the World Health Organisation’s mercury limits. Alarmingly, children aged 2 to 4 were found to be consuming mercury at levels up to 31 times higher than the recommended maximum.
According to Brazilian law, mining on Indigenous lands is strictly prohibited, and the Ministry of Indigenous Peoples has placed combating illegal mining as a priority for President Luiz Inácio Lula da Silva’s administration. The ministry has acknowledged that criminal networks underpin these invasions, necessitating a comprehensive dismantling of their economic and logistical operations.
Why it Matters
The ongoing gold mining rush in the Amazon is not merely an environmental crisis but a multifaceted challenge that threatens biodiversity, Indigenous rights, and public health. As deforestation accelerates and mercury contamination spreads, the consequences will reverberate beyond Brazil, exacerbating global climate change and undermining the foundational ecological systems that sustain life. The need for robust enforcement, international cooperation, and sustainable practices has never been more urgent, as the world grapples with the interconnectedness of environmental degradation and human health.