Another interesting report, well done. Seems you might be in the Pedernales family part of the camp grounds. Not given a closeup special pic as the "find of the day " but that Perd blade is really classic....last pic middle, one side completely worked down.
No idea on the copper ( bronze ? ) find but it's something better than farm machinery. If it was mine I would clean it with an electrolosis coin cleaner ( Googled " COIN CLEANERS ", Harbor freight has an ULTRASONIC cleaner. )
maybe it has some scribing under the patina. A real surprise find.