My bad... I forget that not everyone speaks New Hampshire lol.
The "Kanc" is the Kancamagus nighway (rt 112) in Conway. It connects rt 16 in Conway to Lincoln and rt 93. It's a 32 mile long twisty, turny, scenic road that goes up and over a mountain.
The "Swift" is the Swift river. It runs along the Kanc. There is also the Connecticut river that is along the Kanc as well.
From my research, the best chance of finding gold in NH is from the kanc north up 16 and east to VT. Any of the rivers up that way may hold glacial deposits.