Fresnillo is a city in north central Mexico, founded in 1554 by Francisco de Ibarra. It is the second largest city in the state of Zacatecas and the seat of Fresnillo municipality. As a rail and highway junction, Fresnillo is the center of a rich mining area known especially for silver, and the location of one of the world's richest silver mines, the Mina Proaño or Fresnillo Mine, which belongs to…