Since 1867 , Tornero was the only editor of `` El Mercurio de Valparaíso '' until 1870 , when he partnered with Camilo Letelier .
Tornero was the only editor of `` El Mercurio de Valparaíso '' from 1867 to 1870 . In 1870 , he partnered with Camilo Letelier .