alterior's analysis/forecast, page-36

"Type 4 is difficult because there are refractory and non-refractory components in the same feed and both cannot be recovered, so the choice of treatment route is dependent on cost/benefit of recovering/not recovering each component of feed."

That is simply not true. For example:
1. East pit transitional ore floted fine.
2. Free gold flots very well.
3. Flash flotation cells are often referred to as gravity gold devices because they recover so much free gold.
4. This is why some mines have gravity circuits within their flotation concentrate circuits.

There is gravity recoverable gold at wiluna, but it has to be more profitable to recover gravity gold than not.

That is why there is no gravity recoverable gold at wiluna.