The proposed new Federal Police unit would take a broad view of crimes in the Amazon, where deforestation, illegal mining, and drug trafficking are often interlinked.
The gold market continues to experience tightness due to difficulties expanding existing deposits, and a pronounced lack of large discoveries in recent years.
Russian billionaire Suleiman Kerimov and his family, which until earlier this year held a majority stake in Polyus, are set to face a fresh probe in France.