Thanks so much for the replies everyone! I've had a lot of free time today and so I've hit the books trying to research as much as I can. What I found was interesting, yet slightly disappointing for prospects of finding any caches in Florida.
According to a lot of references, the Spanish
originally came to Florida looking for gold, but they were sorely disappointed when not much of anything was found. Even today, no gold has ever been found in Florida. "The geology of Florida does not present the conditions needed for gold. Most of the state of Florida as we know it today was once covered by water, where limestone deposits were formed and built up over millions of years. Numerous occurrences of flooding and receding ocean waters added sediment deposits as well. Simply put, these are not the geological conditions where gold is found, and there are no known occurrences of natural gold within the state of Florida." says
Gold Mining in Florida. Panning and Prospecting for Gold.
However, on a hopeful note, Spain was here in Florida for a
long time. Over 200 years! Wikipedia had a lot to say on this.
https://en.wikipedia.org/wiki/Spanish_Florida
After all, St Augustine is the oldest city within the USA. If there are any caches in Florida, this stuff would have to of come from somewhere else. Evidently, a lot of the gold that is technically in Florida that is
known, is off the coast. Mainly from sunken Spanish ships, and there are many of them that are still not found. This ties in to what you said earlier Sandy, I think the main thing a lot of people try to do is probe the beach for any of the treasure that washes ashore. This method evidently brings in some nice gains!
Metal detectorist finds rare treasures under sands
In any case, since Spain technically owned Florida for so long, I still think its a possibility that a cache could be hiding out there somewhere. I won't waste massive amounts of time trying to find something I'm not sure is even there, but I'll give a shot in the dark and try to find something. I couldn't find any old Indians trails that the Spanish used, but I think that's because most of the "trails" that they used were actually waterways. Most of the Indians here used Florida's diverse waterways to get around. I suppose it could be assumed for a time the Spanish did as well.
I'll probably poke around some of the waterways around Saint Augustine. Its as good of a place to start that I can think of. If after a little while my search isn't bearing much fruit, I think I'll probably take a plane ride out to the Arizona/NM area. Its pretty much confirmed that there are trails out there, and so the motivation will be high if I know its there.
Anymore tips will be greatly appreciated, and of course I'll update you on my journey as things progress!
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