It looks like Lucapa has found the source pipe of its fabulous alluvial diamond deposits, page-77

The Angolans are treating their Australian partners as mugs.
There should be some sort of ultimatum to bring this % and repatriation nonsense to a conclusion.
This is like a bad debt, the older it is the harder it is to collect.
Lucapa are obviously very aware of their vulnerability in pushing for a conclusive outcome.
Hence the intransigence.

This mob could kick the Aussies out at the drop of a hat,
you know, the one we've all been hanging on to for years now, and not even bat an eyelid.
That's what's liable to happen if we ever find the treasure.
This mob are totally ruthless and worse.