It's a terrific song. I can't help directly with tune or chords (well, I could sing it for you, if you were in earshot), but maybe these will help:

Sheet music is on pp 75-76 of Therese Radic, Songs of Australian Working Life, Greenhouse Publications, Elwood, Victoria, 1989. Who knows, maybe this is available on Google Books.

Recordings are available by The Fagans, on the Kitchen Dance CD, FMCD004, from 1997, Mossbawn Music, PO Box 154, Epping NSW 2121 Australia, and by Us Not Them (nowadays this duo goes by Jason & Chloe Roweth), on the One Man's Weeds - Another Man's Flowers CD, JCCD0005, from 2001, PO Box 175 Jamberoo NSW 2533 Australia.