More than 700 gold coins from the American Civil War that were discovered buried in a Kentucky cornfield are being sold, and the sale is predicted to bring in millions of dollars. According to the corporation that graded the coins and the business that sold them, the "Great Kentucky Hoard" was discovered on a farm in the Bluegrass State earlier this year. Both the precise site of the find and the man who discovered the coins are still a secret. The man is seen digging up the coins in the mud in a video on GovMint.com, which is selling the trove, and is heard exclaiming, "This is the most insane thing ever." GovMint.com said the coins were dated between 1840 and 1863 and include $1 Gold Indians, $10 Gold Libertys and $20 Gold Libertys. Among them are 18 extremely rare $20 Gold Libertys minted in 1863 in Philadelphia which GovMint.com said fetch six-figure sums from collectors. "The importance of this discovery cannot be overstated," said Jeff Garrett, a rare coin dealer who was contacted by the anonymous finder several months ago. "The stunning number of over 700 gold dollars represents a virtual time capsule of Civil War-era coinage," Garrett said in a statement.