I know many on this forum have regularly talked about a lower...

I know many on this forum have regularly talked about a lower Aussie dollar (against the $US) will have a positive impact on the Karara bottom line.
The australian dollar is now hovering around the 71c mark, which is not far off a 10% reduction from the highs of early November. Couple that with the $80+ per WMT average that has been achieved over that same time period, surely we must be making some money at the moment (if not at least breaking even).

Can someone with a sharper mind than mine, explain the impact of a reducing AU$ on the GBG bottom line?