"Chests of round discs (coins)" are supposedly buried in a cave on a "sugar loaf" shaped hill 4 miles north of the confluence of of the Chemung and Susqehanna Rivers.
MAP
More information can be found in
Guide to Treasure in Pennsylvania
Buried Treasures You Can Find
To expand on your story of the "sugar loaf" hill near the Chemung and Susq. Rivers.
It is called "Spanish Hill" located on South Waverly PA on Route 220. Spanish Explorer Leastak Brule' explored the area in the late 1600s. Many artifacts have been found on the hill to include cannon balls, Spanish "pikes" (like a spear) and pottery.... but no one has found the treasure yet.
Dave Pelachik