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A notable increase in global gold prices has ignited a rush for mining in Brazil’s Amazon rainforest, leading to significant deforestation and alarming levels of mercury contamination in protected areas. Recent findings from a collaborative study by Amazon Conservation and the Instituto Socioambiental highlight the detrimental impact of illegal mining activities, which are encroaching upon critical conservation zones and Indigenous territories.
Alarming Rates of Deforestation
The increase in gold prices has incentivised illegal mining operations, which have wreaked havoc on the delicate ecosystems within Brazil’s protected forest areas. The Xingu region, known for its extensive conservation zones, has been particularly affected. The study revealed extensive illegal clear-cutting activities, with satellite imagery and ground research indicating a significant loss of forest cover.
The Terra do Meio Ecological Station, for instance, marked the onset of illegal mining activities in September 2024, which had escalated to a loss of 30 hectares (74 acres) by the end of 2025. Likewise, the Altamira National Forest has seen a staggering 832 hectares (2,056 acres) of forest cleared since 2016 due to mining operations. Notably, a newly established mining front grew to 36 hectares (89 acres) by October 2025, contributing to nearly half of the deforestation recorded in that area for the year.
Illegal Mining Operations Proliferate
The illegal mining crisis is exacerbated by the presence of clandestine airstrips, as evidenced by the detection of such facilities in the Nascentes da Serra do Cachimbo Biological Reserve. Here, illegal mining expanded from 2 hectares (5 acres) in 2024 to at least 26.8 hectares (66 acres) in 2025. According to Amazon Conservation’s findings, an estimated 496,000 hectares (1,225,640 acres) of rainforest have been cleared for mining since 2018, with around 223,000 hectares (551,045 acres) located in the Brazilian Amazon. Alarmingly, about 80% of this deforestation is believed to be illegal.
Despite mining being a relatively minor contributor to overall deforestation—accounting for 17,000 hectares (42,000 acres) of the 579,600 hectares (1,432,000 acres) cleared in the Brazilian Amazon in 2025—the targeted nature of these operations poses a significant threat to protected areas and Indigenous lands. Matt Finer, Director of Amazon Conservation’s Monitoring of the Andes Amazon programme, emphasised the critical need to safeguard Indigenous territories as a means to mitigate further deforestation.
Enforcement Challenges and Criminal Networks
Efforts to combat illegal mining have been met with challenges. In 2023, Brazilian authorities initiated a crackdown on illegal gold mining in the Yanomami Indigenous territory, resulting in a marked decrease in newly mined areas. However, enforcement remains inconsistent, often described as a “cat-and-mouse game.” Federal prosecutor André Luiz Porreca highlighted the ongoing difficulties in maintaining pressure on illegal mining operations, noting that even after significant seizures of mining equipment, operations often resume shortly thereafter.
Porreca revealed that illegal mining is largely financed by Brazil’s most powerful criminal organisations, which have significant resources to support these operations. This financial backing complicates enforcement efforts, as the infrastructure for illegal mining continues to evolve and adapt to regulatory pressures.
Mercury Contamination Concerns
The environmental ramifications of illegal mining extend beyond deforestation. The discharge of mercury into waterways from mining operations poses severe health risks to local communities, particularly Indigenous populations reliant on fish from contaminated rivers. A report submitted by Porreca to the Inter-American Commission on Human Rights outlined the widespread mercury contamination in the Amazon, revealing that 21.3% of fish sold in local markets exceeded the mercury limits set by the World Health Organisation. Alarmingly, children aged 2 to 4 were found to be consuming mercury levels up to 31 times higher than the recommended maximum.
In response to these challenges, Brazilian authorities have pledged to prioritise the protection of Indigenous lands against illegal mining. The Ministry of Indigenous Peoples has stated that dismantling the criminal networks that support mining invasions is essential for effective enforcement.
Why it Matters
The ongoing surge in gold mining within Brazil’s Amazon rainforest poses a critical threat not only to biodiversity but also to the health and livelihoods of Indigenous communities. As illegal operations proliferate, the consequences of deforestation and mercury contamination will have far-reaching impacts, potentially exacerbating climate change and undermining local ecosystems. The situation calls for urgent action and robust enforcement measures to protect one of the world’s most vital natural resources while upholding the rights of Indigenous peoples.