Ann: Drilling Continues to Expand Mineralisation at Opuwo, page-49

Interesting that there are no more hints about the patent being filed, but there is still further work being done on the costs of downstream processing.

"...input in to the Project Scoping Study are largely complete, with remaining work relating to
the operating and capital cost estimates on the downstream processing component of the Project expected to be completed in the coming weeks. The completed Scoping Study is on schedule for reporting before the end
of October, 2018."

Tends to make me think that increased recovery process may relate to the downstream processing, rather than the initial floatation/ leaching processes being completed at the mine itself.

Perhaps the downstream part was never envisaged to be part of the scoping study for stage 1 production but BB found the $$$ increases just way too good to leave out!