Over the years I have been hunting I would estimate I have found 25,000 coins or more. Yet I have never found a gold coin. Silver coins galore from the 1800s forward to modern clad. My oldest coin is a Spanish cob found way down south near the gulf. I found a 1776 dollar coin in the wall of a house plus I have found numerous pieces of jewelry. Rings, necklaces, bracelets, earrings, toe rings, crack pipes, bongs, lighters, and tools by the hand full. I have also found enough junk to fill the bed of a pickup truck several times over. The junk goes with the good stuff because many is the time a junk piece lays right beside or over your good target.
Finally in answer to your question Occasionally someone will stumble across a gold coin on the Florida beaches. Primarily on the Atlantic side or so called Treasure Trail. Hunters find coins all the time but most are reluctant to tell about any gold ones because of the "Treasure police." There have been numerous incidents where coins have been found and claim laid to them by the "Coin *****". Eventually ending in forfeiture of the coin. You should join the hobby if you love the outdoors and like finding lost articles. I purchased my first good machine way back in 1980 and still own it. The very first time it was used my wife found a 14kt gold class ring that paid for over half of what the machine cost.