That comes from Mark Twain’s 1892 novel The American Claimant. He supposedly got it indirectly from a Georgia assayer, Dr. Matthew Fleming Stephenson, who said, “there’s millions in it,” to keep locals from heading to California for the Gold Rush in 1849. The phrase later became corrupted to the above.
Marshall Trimble is Arizona’s official historian. His latest book is Wyatt Earp: Showdown at Tombstone.
If you have a question, write: Ask the Marshall, P.O. Box 8008, Cave Creek, AZ 85327 or e-mail him at firstname.lastname@example.org