The Emigrants - Gold & Glory
by JJ Barrie
Transport and the tyranny of distance was the real problem for the colony.
Distance determined the how far wheat, the most valuable of the farm crops, could be transported. Cattle walked to market losing a little fat but the beef the small population could consume, was limited. Only sheep were valuable enough to show a profit. However, the lifeblood of the colony was labour.
Then they found gold!