Bonanza various times) Guy Williams, David Canary, Mitch Vogel, and Tim Matheson. The show is known for presenting pressing moral dilemmas. The title "Bonanza" is a term used by miners in regard to a large vein or deposit of silver ore, from Spanish "bonanza" (prosperity) and commonly refers to the 1859 revelation of the Comstock Lode of rich silver ore mines under the town of Virginia City, not far from the fictional Ponderosa Ranch that the Cartwright family operated. The show's theme song, also titled "Bonanza", became a hit song. Only instrumental renditions, absent Ray Evans' lyrics, were used during the
Bonanza more season, whereupon Williams found himself pushed out of the part; it was rumored that Landon and Greene felt threatened by the studio initiating a precedent of successfully replacing one heroic leading man Cartwright with a new one, particularly in view of Williams' popularity with viewers. Williams had previously portrayed the titular character in Walt Disney's "Zorro" television series, and went on to play the lead in "Lost in Space", a science fiction television series, after the role in "Bonanza" ended. After graduating from the University of Cincinnati, David Canary was offered a left-end position with the Denver Broncos, but