As I near closer to this excavation of a couple ponds, The decision will need to be made on how to seal them. I have no indications yet that there will be good quality clay in the dig to save as sealing material. Lots of sand so if even if there is clay, it will probably be mixed with sand that will ruin the seal.
There will a combined area of about 1.5 acres of pond. Due to the remote location, hauling anything in will be expensive. I know the tried and true method is Bentonite or other clays found in the bottom. The reason I ask is I have heard that salt has been used successfully to seal ponds. As I understand it, it goes into solution with water, percolates through the bottom, then recrystalizes to block leaks.
I am open to ideas. We built my dad's pond when I was a boy and to this day, it is not sealed and reinforcing the importance of this in my head.