Brazil Uses Gold Fingerprinting to Combat Illegal Amazon Mining

Brazil's federal police have established a "gold lab" at the National Institute of Criminalistics in Brasilia to combat illegal gold mining in the Amazon rainforest. This initiative employs a forensic technique known as "gold fingerprinting" to precisely trace the origin of gold samples. The method aims to determine if gold seized in raids originates from protected areas, indicating illegal extraction. This process is crucial for addressing deforestation and mercury contamination exacerbated by illegal mining activities.

The "gold fingerprinting" technique analyzes the unique composition of gold samples, which absorb trace particles like silver and copper from their natural formation environment. These absorbed elements act as a "fingerprint," allowing investigators to match seized gold with data from specific geological areas. If a gold sample's fingerprint matches that of a protected national forest or Indigenous land, it signifies illegal sourcing. This forensic evidence is vital for building legal cases against those involved in illicit mining operations.

Gustavo Geiser, a federal police forensics expert, stated that this method has been under development since 2019 through collaborations with Brazilian universities. The lab utilizes advanced analytical tools, including X-ray fluorescence spectrometry, scanning electron microscopy, and laser ablation mass spectrometry, to conduct increasingly complex forensic examinations. The primary objective remains to definitively answer the question: "Where did this gold come from?" The successful application of this technique is expected to strengthen law enforcement efforts against illegal mining and its devastating environmental consequences in the Amazon.