miércoles, 5 de julio de 2017

Mining Hills

The mining mountains of La Union contain important metallic mineral deposits, mainly of lead and zinc, and was characterized by an intense mining activity already in times of Carthaginians and Romans. The mining boom of the 19th century filled these mountains with underground mining, and from 1950 onwards, open pit mining had a brutal impact on the landscape, until the mining shut down in 1991.