Try this:
gCGA#D

G-minor variant

Mike Seeger, Roustabout ("Solo"). Seeger plays this on a gourd banjo, tuned down. He gives his source as "Josh Thomas of Hollins, VA, an exceptional blind black banjo picker and singer", who was recorded in 1970 by Cliff Endress.

From: http://www.banjo.ch/knowhow/stimmungen.htm