Similarly, between 1616 and 1619, Governor Juan de Solórzano carried out a survey of work conditions in the Huancavelica mercury mines (directly exploited by the Crown, in distinction to the silver mines, which were in private hands): “The poison penetrated to the very marrow, debilitating all the members and causing a constant shaking, and the workers usually died within four years,” he reported to the Council of the Indies and to the king.
