I think they have been talking about a mine that will produce...

I think they have been talking about a mine that will produce 100,000 ounces per year for 10 years at US $700 AISC.

Interesting maths;
Current US Gold price minus AISC = US $1,900 - US $700 = $1,200
US $1,200 converted to AUD = $1,542
100,000 x AUD $1542 = AUD $154,200,000 per year
AUD $154,200,000 per year x 10 years = AUD $1,542,000,000