From http://zeppmusic.com/banjo/aktuning.htm (Banjo-L)

gDGCD "G-modal", "Mountain Minor", "Sawmill" One of the most common banjo tunings for tunes in Dorian & Aeolian modal scales. E.g. Cluck Old Hen; Pretty Polly; Shady Grove; Little Sadie; The Cuckoo; East Virginia. Also sometimes used for D-centered tunes: e.g. Dock Boggs, Sugar Baby ("Dock Boggs: 12 Original Recordings"; "Dock Boggs, Vol 2"). Heath Curdts, Boll Weevil ("A Tribute to Tommy Jarrell") Curdts says that Jarrell used it for Chilly Winds. In BNL, Dec 1988, Ken Perlman discussed the use of this tuning for playing in B-flat and E-flat.