Mining & Infrastructure
Key Facts
—The Spill. A Ferromex train operated by Grupo Mexico derailed in Sonora, releasing roughly 59,000 litres of sodium hydrosulfide.
—The Chemical. Sodium hydrosulfide is a toxic industrial compound that can release dangerous hydrogen sulfide gas upon contact with water or acids.
—Immediate Response. Local authorities ordered evacuations and shelter-in-place protocols for nearby communities while hazmat teams deployed to the site.










