You're showing Chatree from 20 years ago, when they had small...

You're showing Chatree from 20 years ago, when they had small pits picking out the highest grade areas, to fill a small plant?

Quartz could give small blocks with those grades, but not an average grade that high to fill 7mtpa.

A pit (North / Main) is the best comparison, since we'll likely be mixing in A pit ore to get up to 7mtpa. So if quartz is good, it'll just be pushing up A pit's average.

If it was 0.5-0.6gpt pre closure, and mixed 50/50 with quartz and A pit, then you're expecting extreme grades from quartz (even though there's lots of waste in quartz too). If they're profitable at 0.5gpt, they're not going to keep the 2gpt from quart and throw out the 1gpt. They'll keep pushing out the pit boundaries until it hits 0.5-0.6gpt.

But if the center of Quartz averages say 1gpt, then we might get that grade for 1+ year until the pit gets bigger, and they don't want to toss the 0.6gpt. Same as A's grade fell as it got bigger.