1999 $10 Millennium The Past Selectively Copper Plated 1oz Silver Proof CoinThis bimetallic proof coin reflects on the significance of the change of millennium. The copper centre symbolises the richness and maturity of the ancient continent with the surrounding silver indicating the linking of indigenous and other cultures over time. Rising through the centre is a seedling signifying the growth of Australia as a nation. On the horizon, the sun rising represents the combination of environment and culture into energy feeding