old farmstead in the woods

I was given info about an old farmstead in the woods that dates to the late 1700's. I was told this was MD'd about 10 years ago and gave up some early 1800 coins and some clothing buttons depicting George Washington. My question is , do I bother hitting this spot again? I did hit a spot that wasnt on the actual farm sit and came up with a few things, a late 1800's glass telegraphy insulator, and a rock with metal veins running through it (looks like a piece of Bog Iron to me).

Also have new info and location of old foundry where they used to make cannons and cannon balls for the revolutionary war. I know the spot that they test fired them to. That may be later today or all day tomorrow.