Hey, an ex CPC employee here..
I worked for CPC for 2 and a bit years and for the most part had a pretty good time with them. Work is very up and down, some weeks you'll work 7 14 hour days and then next week be lucky to get 12 hours in. The work is mining so its dusty, dirty shitty work, with long days and long periods away from home.
As for Kalgoorlie I didn't mind my time there, got a bit boring on extended periods off work. Theres plenty to do for families and night life if pretty good. Real estate agents are a@#holes. Shopping is expensive and half the food has gone off when you buy it.
You'll enjoy your first summer there when it gets to 46c!! Get a house with a pool...And winter, as it is now, is cold or bloody cold once you've got used to the heat of summer.
Feel free to pm me for anything