"Bonanza" is a television series in the western United States that aired on NBC from September 12, 1959 to January 16, 1973. "Bonanza" lasted for 14 seasons and 431 episodes. It is NBC's longest-running Western movie. It ranks second overall. It is broadcast on American Internet TV and is the ten longest-running live-action TV series in the United States. The show is known for presenting urgent moral dilemmas. The title "Bonanza" is a term for large veins or silver deposits obtained by miners from Spanish bonanza. It usually refers to the revelation of the Comstock vein in 1859 to rich silver. A mine in Virginia City, away from the fictional operation of the Cartwright family The Ponderosa Pine Ranch is not far away. The theme song of the show was also called "Bonanza" and became a hit song. In 2002, "Ponanza" ranked 43rd among the 50 greatest TV shows of all time in "TV Guide" and was included in the list of "60 Greatest Dramas of All Time" by "TV Guide" in 2013 .