1875: the Silver King Mine is discovered in the Pinal Mountains. The first ore taken from the mine is assessed at $4,300 per ton.

1906: A meeting of the Board of School Trustees addresses the "unbecoming conduct" of six teachers in Tucson Public Schools. The teachers had gone on a Sunday picnic to Sabino Canyon at which they "drank beer and wine and smoked cigarettes."

1907: The Territorial Legislature moves the Territorial Prison from Yuma to Florence.

Want to share an important event from Tucson's history? Email it to krumore@azstarnet.com.