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there's a particular agriculture field, outside a town near me, that had a contact era indian rancheria from the 1790s to the 1820's. After that, history records that the remaining indians dispersed, and the little rancheria was no-more. We have hunted the sn*t out of this field, and have found reales, buttons, etc... there from the time-period of the rancheria.
After the late 1700s/early 1800s little burg ended, the spot was nothing more than cattle lands. Ie.: no people there anymore. Just cattle land. Then starting in about the 1910s or '20s, the land became row crops (leaf vegetables, sugar beats, etc....). Thus you might think that starting in the 1910's or '20s, there might be reason for occasional fumble fingers losses from fieldworkers, right? And yes, occasionally a buffalo nickel, or a wheatie or a silver washington has turned up. TOTALLY not what we're looking for (we could care less about those "new" coins). But the point has occurred to me, that if I was there for that purpose (random field worker losses) that would be a very lousy place to be coin-hunting. I mean, for any one wheatie or mercury, we'd have put in 50 hrs. or whatever.
So sure, if you just turn on your detector, and randomly walk into the forests, fields, desert, mountains, etc.... sure you'll eventually "find something". But no, unless you were in Europe where fields had continuous cultivation for 1000 to 2000 or more years, (of which all of that prior to 1900 was by hand, as there was no tractors, hence more "hand work"), then no, you'd be wasting your time in most of the USA. You're much better off to spend your time where there was something going on. Preferably a place where coins changed hands, like for retail purposes (saloon, stage stop, etc...), or where people slept and camped (thus taking clothes on and off, getting in and out of bed-rolls, etc...), or where people recreated and frolicked.