Agua Amarga is a silver deposit and defunct mining district in Chile's Atacama Region. It is located 30 km south of Vallenar. Agua Amarga was discovered in 1811 and its silver was instrumental to finance the Chilean War of Independence. An enquiry by Ignacy Domeyko tells of 150 individual mines active in Agua Amarga in 1822. Calera, Colorada and Aris are mentioned as the most productive mines of Agua Amarga.