The metals in the Amazon are one of the region’s most valuable and controversial resources. Beneath the world’s largest tropical rainforest lie huge deposits of iron ore, bauxite, copper, manganese and gold. Mining these resources generates jobs, exports and revenue, but it can also cause deforestation, pollution and conflicts with Indigenous peoples and traditional communities.
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This article explains where the main metal deposits are, how mining has shaped the region and what challenges it brings for the environment and local populations.
Why the Amazon is so rich in minerals
The Amazon basin sits on very old geological formations, including ancient rock shields that have been forming and eroding for hundreds of millions of years. Over time, geological processes concentrated minerals in certain areas, creating rich deposits. Tropical weathering, caused by heat and heavy rain, also helped form deposits such as bauxite, the main ore used to produce aluminum.
The main metal deposits
Iron ore in Carajás
The Carajás region, in the state of Pará, is home to one of the largest and highest-grade iron ore deposits in the world. Mining began on a large scale in the 1980s, along with a railway that carries the ore to a port on the coast of Maranhão, from where it is exported to countries around the world. The Carajás area also has deposits of copper, manganese and nickel.
Bauxite and aluminum
Pará also has large bauxite deposits, in areas such as the Trombetas River region and Paragominas. Bauxite is processed into alumina and then into aluminum, a metal used in packaging, vehicles, construction and electronics.
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Gold
Gold is found in many parts of the Amazon, especially in river basins such as the Tapajós. It has attracted miners for decades. In the 1980s, Serra Pelada, in Pará, became famous for its open pit, where thousands of workers dug by hand in search of gold.
Industrial mining vs. illegal mining
It is important to distinguish two very different activities:
- Industrial mining is carried out by companies with licenses, environmental studies and legal obligations. It still has significant impacts, but it is subject to regulation and monitoring.
- Illegal mining, known in Brazil as garimpo ilegal, often takes place inside protected areas and Indigenous territories, without licenses or environmental controls. It has expanded in recent years and is one of the main threats to the forest.
Environmental and social impacts
Deforestation and river damage
Mining requires clearing forest for pits, roads and infrastructure. Illegal gold mining also destroys riverbanks and river beds, making water muddy and harming fish.
Mercury contamination
In illegal gold mining, mercury is frequently used to separate gold from sediment. Part of this mercury ends up in rivers, where it can accumulate in fish. Communities that depend on fish for food, including Indigenous peoples, may be exposed to mercury, which can harm the nervous system and is especially dangerous for pregnant women and children.
Indigenous territories
Illegal mining has caused serious crises in Indigenous lands. In 2023, the Brazilian government declared a public health emergency in the Yanomami territory, where the presence of illegal miners was linked to malnutrition, disease and violence. Brazil’s Constitution sets special rules for mining in Indigenous lands, and illegal activity in these areas is a major focus of enforcement operations.
Controlling the gold trade
One of the challenges is tracing where gold comes from. Illegally mined gold can be mixed with legal gold and sold as if it were legitimate. In recent years, Brazilian authorities and courts have tightened rules on the gold trade, including measures to improve traceability and the use of electronic invoices, making it harder to “launder” illegal gold.
Balancing development and conservation
Mining is an important part of the economy of states such as Pará, generating jobs and tax revenue. At the same time, the long-term value of the forest, for biodiversity, climate and the people who live there, is enormous. Possible paths for a better balance include:
- Stronger enforcement against illegal mining.
- Better traceability of metals, especially gold.
- Strict environmental licensing and monitoring of legal operations.
- Recovery of degraded areas after mining ends.
- Respect for the rights of Indigenous peoples and traditional communities.
Critical minerals and the energy transition
Demand for certain minerals is growing as the world shifts to renewable energy, electric vehicles and batteries. Copper, nickel, manganese, rare earth elements and other "critical minerals" are essential for wind turbines, solar panels, power grids and batteries. Brazil has significant mineral resources, including in the Amazon region, which brings both economic opportunities and the challenge of ensuring that new mining projects respect strict environmental and social standards.
Mining and the economy
Mining is an important part of Brazil's exports, and the state of Pará is one of the main mining regions in the country. Large projects generate jobs, taxes and royalties for municipalities and states. However, economic benefits are not always distributed fairly, and communities near mines often face pressure on housing, health services and the environment. Transparency in how royalties are used is an important issue.
Technology to monitor mining
Satellite images and remote sensing tools allow authorities and researchers to detect illegal mining sites, track river sediment and monitor deforestation linked to mining. Organizations such as MapBiomas publish data on the expansion of mining areas in Brazil, helping inform public policy and enforcement.
Restoring mined areas
Responsible mining includes plans to restore land after operations end. Restoration can involve reshaping the land, recovering soil and planting native species. In the Amazon, restoration is challenging because of the complexity of tropical ecosystems, but research and practical experience are improving techniques.
Consumers and responsible sourcing
Companies that buy gold and other metals are increasingly expected to trace the origin of materials and avoid supply chains linked to illegal mining, deforestation or human rights violations. Consumers can ask jewelers and brands about their sourcing policies and support certified, responsible supply chains.
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Conclusion
The geography of metals in the Amazon helps explain both the wealth and the tensions of the region. Iron ore, bauxite, copper and gold support major industries and exports, but mining, especially when illegal, can damage forests, rivers and communities. The challenge for Brazil is to use these resources responsibly while protecting one of the most important ecosystems on Earth.