While mining declined after Independence, it never ceased completely and there were various operations in the 19th and 20th centuries. En English company installed itself to mine silver in Pinal de Amoles in 1865. A Mexican company was founded in 1887 for the same purpose. A US company called El Soyatal began mining antimony in 1944. Mercury mining began again in 1960, which caused an economic boom, but by 1970, prices for this element fell and ended most of the mining here.