I'm confused. You seem to be seeking a silver mine in a sedimentary rock known to host gas and oil. You don't have to know much geology to know a silver deposit can not exist in those circumstances,
Maybe nearby there are sedimentary rocks that host zinc and lead? (SEDEX) If so there might be a chance of silver/lead ore but not free milling silver. When searching sedimentary rocks for silver deposits you would look for dark gray galena. Silver, if any, would be combined with the galena and zinc.
Here are the known galena deposits in Kentucky along with some pictures of what to look for.
Mindat.org is the world's leading website about minerals and where they come from.
www.mindat.org
There is one known SEDEX deposit in Kentucky but the silver is only trace amounts and none of the minerals have commercial values.
Good luck