G,
Nice finds, can you post a better picture of the large piece that you say appears to be copper? Any markings visible...
Your 1/2s look to range from Carlos II to Felipe V, 1 appears to show a date of 1703, the others I cant quite make out, but one looks like the top of an 8 just below the A in Carlos, thus middle digit of 168?...Mints are definitely South America, Lima possible the one with the "fat bar" cross. The other 2 could be Lima but could also be Potosi. Just my WAG.
I gotta tell you, you sure live in the right spot for finding these...I would be out everyday !!!
Thanks for sharing and post when you find more?
Trez