"According to Perilya's website, the North Mine Deeps resource contains 3.7 million tonnes at 11.3 per cent zinc, 13.5 per cent lead and 219 g/t silver making it one of the highest grade deposits in the world."
I don't think that it will be a huge issue.
It's not like they aren't already operating down the road.
Really it's part of the same facility.