Malcolm North of Wilcannia, I think, is the town of White Cliffs - opal country. A large number of families went there, I don't know when - haven't time to look it up, but because of the severe conditions out that way, and the total lack of water, some of them - quite a lot I believe, tried to make for other opal fields, and died on the way, particularly the children. it's a sad tale. Perhaps that's way there are graves in the remote area. Regards PastW