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[Correspondence] Cerro Matoso mine, chemical mixtures, and environmental justice in Colombia

On March 16, 2018, a milestone event in the history of environmental health in Colombia occurred; the Colombian Constitutional Court decided that the Cerro Matoso ferronickel mine in Montelibano, Córdoba, had caused irreparable damage to the environment and health of people living in the surrounding area.1 Cerro Matoso mine, controlled by the multinational company BHP Billiton, is one of the largest open-pit ferronickel mines in the world, and has been an important source of income for Colombia since the mining and metallurgy processes began in 1982.